Jurnal Kelautan Tropis最新文献

{"title":"Korelasi Klorofil-a dengan Nutrien dan Kualitas Perairan di Pulau Seruni Karimunjawa Indonesia","authors":"Rikha Widiaratih, Agus Anugroho Dwi Suryoputra, Gentur Handoyo","doi":"10.14710/jkt.v25i2.14170","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.14170","url":null,"abstract":"Seruni Island is one of the islands located in the easternmost and is an uninhabited island in Karimunjawa, Jepara Regency, Central Java. Seruni Island has a tourist attraction, namely a stretch of white sand, coral reefs, and which is currently used by local people for seaweed cultivation. There are still many tourism opportunities and marine utilization that have not been utilized optimally. Knowing the availability of chlorophyll-a and its correlation with nutrients (ammonia, nitrate, and phosphate) and water quality on Seruni Island can provide an initial overview of the fertility conditions of the waters on Seruni Island so that other marine utilization opportunities can be wide opened. In situ data are collected such as seawater samples, which are then analyzed in the laboratory, as well as water quality parameters including salinity, pH, DO, temperature and brightness. Although Seruni Island is an uninhabited island, however, it is possible that there will be runoff from the surrounding inhabited islands, which will increase the concentration of chlorophyll-a. The results showed that chlorophyll-a had a high and negative correlation with nutrients, namely ammonia (r=-0.985), and water quality, namely temperature and brightness (r=-0.895 and r=-0.734).  Pulau Seruni merupakan salah satu pulau yang lokasinya terletak paling timur dan merupakan pulau tidak berpenghuni di Karimunjawa, Kabupaten Jepara Jawa Tengah. Pulau Seruni memiliki daya tarik wisata yaitu hamparan pasir putih, terumbu karang, dan yang saat ini dimanfaatkan masyarakat setempat untuk budidaya rumput laut. Masih banyak peluang wisata dan pemanfaatan bahari yang belum dimanfaatkan secara optimal. Dengan mengetahui ketersediaan klorofil-a dan korelasinya terhadap nutrien (ammonia, nitrat dan fosfat) dan kualitas perairan di Pulau Seruni dapat memberikan gambaran awal terkait kondisi kesuburan perairan yang ada di Pulau Seruni, sehingga dapat terbuka peluang pemanfaatan bahari lainnya. Data in situ yang diambil berupa sampel air laut, yang selanjutnya dianalisis di laboratorium, serta parameter kualitas perairan meliputi salinitas, pH, DO, suhu dan kecerahan. Walaupun Pulau Seruni merupakan pulau yang tidak berpenghuni, namun demikian tidak menutup kemungkinan terdapat limpasan massa air yang berasal dari pulau sekitarnya yang berpenghuni yang berdampak pada meningkatnya konsentrasi klorofil-a. Hasil penelitian menunjukkan klorofil-a memiliki korelasi yang tinggi dan bernilai negatif dengan nutrient, yaitu ammonia (r=-0,985), dan kualitas perairan yaitu suhu dan kecerahan (r=-0,895 dan r=-0,734). Kata kunci : klorofil-a, nutrient, kualitas perairan, Korelasi, P.Seruni","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46013755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribusi Horizontal Klorofil-A dan Material Padatan Tersuspensi di Muara Bodri, Jawa Tengah","authors":"Alif Maulida Amna, Lilik Maslukah, Sri Yulina Wulandari","doi":"10.14710/jkt.v25i2.13949","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13949","url":null,"abstract":"The Bodri Estuary receives mass input of water from land which carries nutrients and suspended matter. This will have an impact on the fertility and quality of the Bodri Estuary. Monitoring the quality of these waters is very important so that the condition of the waters and the level of fertility are known, which are closely related to fishery productivity. The aim of this study was to obtain the concentration and horizontal distribution of chlorophyll-a, total suspended solids (TSS) and its relationship to other environmental parameters, such as salinity, pH, DO, temperature, and transparancy. Sampling was carried out in July 2020. The analysis of chlorophyll-a using the spectrometric and TSS by gravimetric method. Principal component analysis (PCA) in this study was used to see the relationship between chlorophyll-a and TSS on the other environmental parameters. The results showed that the concentration of chlorophyll-a ranged from 1.09 - 15.89 g/L and SPM ranged from 53.2 mg/L - 139 mg/L. The distribution of chlorophyll-a and TSS showed higher in the estuary and slowly decreased towards the sea. The results of the analysis showed that chlorophyll-a and TSS had a very strong positive correlation (r = 0.927, P < 0.001). Salinity and pH are parameters of the aquatic environment that affect its distribution. The negative correlation between TSS and chlorophyll-a on salinity illustrates the influence of the water mass source from the river. This relationship illustrates the important role of river water input on fertility processes in marine areas in supporting potential fishing areas  Muara Bodri menerima masukan massa air dari darat yang membawa nutrien dan material tersuspensi.  Hal ini akan berdampak terhadap kesuburan dan kualitas Muara Bodri. Monitoring kualitas perairan ini sangat penting dilakukan sehingga diketahui terkait kondisi perairan dan tingkat kesuburan, yang sangat berkaitan dengan produktivitas perikanan. Penelitian ini bertujuan mendapatkan konsentrasi dan distribusi horizontal dari klorofil-a, material padatan tersuspensi (MPT) serta hubungannya terhadap parameter lingkungan lain, seperti salinitas, pH, DO, suhu, dan kecerahan. Pengambilan sampel dilakukan pada Juli 2020. Metode analisis klorofil-a dilakukan secara spektrometri dan MPT secara gravimetri. Analisis komponen utama (AKU) dalam penelitian ini digunakan untuk melihat keterkaitan antara klorofil-a dan MPT terhadap parameter lingkungan lainnya. Hasil penelitian menunjukkan bahwa konsentrasi klorofil-a berkisar antara 1,09 - 15,89 µg/L dan MPT berkisar 53,2-139 mg/L. Distribusi klorofil-a dan MPT menunjukkan lebih tinggi di muara dan secara perlahan-lahan mengalami penurunan ke arah laut. Hasil analisis menunjukkan bahwa klorofil-a dan MPT memiliki korelasi positif sangat kuat (r = 0,927, P < 0,001). Korelasi positif ini menggambarkan bahwa kontribusi klorofil-a sangat tinggi terhadap MPT tersebut, sehingga dapat menggambarkan melimpahnya fitoplankton. Salinitas dan pH","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43886047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pemodelan Pola Sedimentasi di Muara Cisadane untuk Mendukung Pengembangan Terpadu Pesisir Ibukota Negara","authors":"Mardi Wibowo, Hanah Khoirunnisa, Khusnul Setia Wardhani, R. Wijayanti","doi":"10.14710/jkt.v25i2.13732","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13732","url":null,"abstract":"NCICD is one of the national strategic programs to deal with coastal problems in Jakarta. One alternative structure to be built is WLP or known as coastal resort. As an initial step to make it happen, BAPPENAS plans to build a WLP pilot plan around the S. Cisadane estuary. One of the main considerations for designing the WLP layout is the process and pattern of sedimentation around the Cisadane estuary. Therefore, computational modeling of sediment transport around the Cisadane estuary was carried out for a period of 1 year (August 2020-July 2021). This modeling uses MIKE-21 module MIKE21/3 Integrated Models software which combines hydrodynamics and cohesive sediment transport models. Based on the results of this modeling, it is known that there are differences in sediment transport patterns in the west and east monsoons. During 1 year, changes in the thickness of the bottom sediment around the estuary of S. Cisadane ranged from -0.4 to 0.7 m with a mean of 0.086 m. Coastal reservoir design must take into the very dynamic sedimentation process around the Cisadane estuary.   Pengembangan Terpadu Pesisir Ibukota Negara (PTPIN) merupakan salah satu program strategis nasional untuk menangani permasalahan pesisir di Jakarta. Salah satu alternatif struktur yang akan dibangun adalah WLP atau dikenal sebagai coastal reservoir. Sebagai langkah awal mewujudkannya BAPPENAS merencanakan membangun pilot plan WLP di sekitar muara S. Cisadane. Salah satu pertimbangan utama untuk mendesain layout WLP adalah proses dan pola sedimentasi di sekitar muara Cisadane. Oleh karena itu dilakukan pemodelan komputasi transpor sedimen di sekitar muara Cisadane selama kurun waktu 1 tahun (Agustus 2020-Juli 2021). Pemodelan ini menggunakan software MIKE-21 module MIKE21/3 Integrated Models yang menggabungkan model hidrodinamika dan transpor sedimen kohesif. Berdasarkan hasil pemodelan ini diketahui bahwa terdapat perbedaan pola transpor sedimen di musim barat dan musim timur. Selama 1 tahun, perubahan ketebalan sedimen dasar di sekitar muara S. Cisadane berkisar -0,4-0,7 m dengan rerata 0,086 m. Pola sedimentasi yang sangat dinamis harus mendapatkan perhatian khusus dalam merancang waduk lepas pantai. ","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46644519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alokasi Energi, Fekunditas, dan Sintasan Larva Cacing Nipah Simpatrik (Polychaeta: Nereididae)","authors":"Junardi Junardi, Tjandra Anggraeni, A. Ridwan, Edy Yuwono","doi":"10.14710/jkt.v25i2.13867","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13867","url":null,"abstract":"Two species of semelparity Nypa palm worms can only reproduce once during their lifetime lives sympatrically. This reproductive is a unique strategy for allocating energy and fecundity to maximize fertility and larval survival. Information about energy allocation and fecundity of semelparity Nypa palm worms is not yet available. This study aimed to obtain data on the strategy of two species of sympatric Nypa palm worms related to total energy allocation, fecundity, and larval survival. Energy allocation determining by the proportion between reproductive energy and somatic energy. Fecundity was calculated based on the total number of oocytes obtained from the same individual samples used for energy measurement. Larvae survival was counting the trochophore and 3-setigers larvae resulting from fertilization. Energy allocation, fecundity, and survival were analyzed descriptively. The results showed that both sympatric species allocated energy for reproduction. The fecundity of Namalycastis rhodochorde was higher than that of Namalycastis abiuma, but had lower larval survival than N. abiuma. Fecundity in N. rhodochorde is a strategy to compensate for the low survival rate. Meanwhile, N. abiuma had lower fecundity but had high larval survival. Fecundity and larval survival between the two sympatric Nypa palm worm species differed, but both allocated the same energy. Different larval survival yet similar energy allocation is their strategy to survive in the same environmental conditions.    Dua spesies cacing nipah semelparitas yang hanya dapat melakukan reproduksi sekali selama hidupnya ditemukan hidup secara simpatrik. Kemampuan adaptasi ini mengindikasikan adanya strategi yang khas dalam mengalokasikan energi dan fekunditasnya sehingga dapat memaksimalkan fertilitas dan sintasan larva, namun informasi tersebut masih belum tersedia. Tujuan penelitian ini untuk mendapatkan data strategi dua spesies cacing nipah simpatrik terkait dengan alokasi energi total, fekunditas, dan sintasan larva. Alokasi energi dideterminasi dengan menghitung proporsi antara energi reproduksi  dan energi somatis. Fekunditas dihitung berdasarkan jumlah total oosit yang didapatkan dari sampel individu yang sama dengan yang digunakan untuk pengukuran energi. Penghitungan sintasan dilakukan dengan menghitung jumlah larva trokofor dan larva 3-setiger hasil fertilisasi. Data alokasi energi, fekunditas, dan sintasan dianalisis secara deskriptif. Hasil penelitian menunjukkan kedua spesies simpatrik mengalokasi energi untuk reproduksi. Fekunditas Namalycastis rhodochorde lebih tinggi dibandingkan Namalycastis abiuma, namun memiliki sintasan larva yang lebih rendah dari N. abiuma. Fekunditas pada N. rhodochorde merupakan startegi untuk mengimbangi rendahnya sintasan. Sementara itu, N. abiuma memiliki fekunditas yang lebih rendah namun memiliki sintasan larva yang tinggi. Fekunditas dan sintasan larva antara kedua spesies cacing nipah simpatrik ditemukan berbeda namun keduanya mengalokas","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46625430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Penutupan, Rugositas Terumbu Karang dan Kelimpahan Ikan Karang di Perairan Utara Bangkalan","authors":"Lisa Ariyanti, Heni Novitasari, I. Insafitri, Wahyu Andy Nugraha","doi":"10.14710/jkt.v25i2.13769","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13769","url":null,"abstract":"Coral reefs are marine organisms in the form of limestone (CaCO3). Reef fish are fish associated with coral reefs. The abundance of reef fish is influenced by the fertility of coral reefs in the waters. This research was conducted in September 2021 in the waters of Lembung Paseser and Labuhan with 2 stations in the waters of Lembung Paseser and 2 stations in the waters of Labuhan. This study aims to determine the condition of coral reefs, percentage of live coral cover, abundance of reef fish, diversity index (H'), uniformity (E), dominance (C) and to determine the relationship between coral reefs and reef fish. The coral cover data collection method is LIT (Line Intercept Transect) and the coral reef rugosity data collection method uses the CIT (Chain Intercept Transect) method, while the coral fish data collection methods are the belt transect method and the Underwater Visual Census (UVS). Percentage of coral cover ranging from 11% to 37% classified as damaged to moderate damage. The abundance of reef fish at station 1 was 0.18 ind/m2, station 2 was 0.106 ind/m2, station 3 was 0.908 and station 4 was 0.216 ind/m2. The average rugosity value at station 1 is 1.17, station 2 is 1.23, station 3 is 1.33 and station 4 is 1.16. The indicator fish species in Lembung Paseser waters were Chelmon rostratus and Heniochus diphreutes as many as 7 individuals while the indicator fish species in Labuhan waters were Chaetodon vagabundus and Heniochus diphreutes as many as 15 individuals. The correlation between coral reef cover and reef fish was 54.06% which showed a strong correlation, while the correlation between coral reef rugosity was 73.52% which showed a strong correlation.  Terumbu karang merupakan organisme laut berupa batuan kapur (CaCO3). Ikan karang merupakan ikan yang berasosiasi dengan terumbu karang. Kelimpahan ikan karang dipengaruhi oleh suburnya terumbu karang di perairan. Penelitian ini dilaksanakan pada bulan September 2021 di perairan Lembung Paseser dan Labuhan dengan 2 stasiun perairan Lembung Paseser dan 2 stasiun di perairan Labuhan. Penelitian ini bertujuan untuk mengetahui kondisi terumbu karang, persentase tutupan karang hidup, kelimpahan ikan karang, indeks keanekaragaman (H'), keseragaman (E), dominasi (C) dan untuk mengetahui hubungan terumbu karang dan ikan karang.  Metode pengambilan data tutupan karang yaitu LIT (Line Intercept Transect) dan metode pengambilan data rugositas terumbu karang menggunakan metode CIT (Chain Intercept Transect), sedangkan metode pengambilan data ikan karang adalah metode belt transek dan Underwater Visual Sensus (UVS).  Persentase tutupan karang berkisar 11% sampai 37% tergolong rusak hingga kerusakan sedang.  Kelimpahan ikan karang pada stasiun 1 sebesar 0,18 ind/m2, stasiun 2 sebesar 0,106 ind/m2, stasiun 3 sebesar 0,908 dan stasiun 4 sebesar 0,216 ind/m2. Nilai rugositas rata rata pada stasiun 1 yaitu 1,17, stasiun 2 yaitu 1,23, stasiun 3 yaitu 1,33 dan stasiun 4 yaitu 1,16. Jenis Ikan indikator d","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49474690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Asosiasi Siput Gonggong (Strombus sp.) pada Ekosistem Lamun Di Pesisir Timur Pulau Bintan","authors":"N. Hati, Ita Karlina, Rika Angraeni, A. Nugraha, F. Idris, Jelita Rahma Hidayati","doi":"10.14710/jkt.v25i2.13414","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13414","url":null,"abstract":"The east coast of Bintan Island is an area that has a wide distribution of seagrass with good conditions for the association of Strombus sp in the seagrass ecosystem. This research aims to identify seagrass coverage and abundance of golden snails (Strombus sp) and study the association of golden snails (Strombus sp.) in seagrass ecosystems on the east coast of Bintan Island. This research was conducted on the East Coast of Bintan Island from June until July 2021 (Teluk Bakau Village, Malang Rapat Village and Berakit Village). The tools and materials used in this research were GPS, 1x1 m quadrant transect, roller meter, digital scales, calliper, multitester, hand refractometer, pH meter, pipe (20cm), sieve net, stationery and aluminium foil. The sampling method used three transects with a distance of 100 m towards the sea with a distance between transects of 50 m, with a 1 x 1 m quadrant transect beginning from point 0 until 100 m. Data analysis used in this research were seagrass coverage, Strombus sp. abundance and PCA (Principal Component Analysis) analysis which relates the abundance of barking snails, seagrass cover, water physicochemical parameters and substrate. Strombus sp. found are Strombus urceus, Strombus canarium and Strombus turturella. The Strombus urceus type has a high 4,3 ind/m2 abundance value compared to other types of Strombus sp. at all stations. Types of Strombus canarium and Strombus turturella were mostly found in low seagrass cover and associated with seagrass species Halophila, Thalassia hemprichii and Halodule uninervis, while Strombus urceus species were mostly found in medium and dense seagrass cover and positively associated with Enhalus acoroides, Thallasia hemprichi, Cymodocea rotundata.    Pesisir Timur Pulau Bintan merupakan wilayah yang memiliki sebaran lamun yang luas dengan kondisi baik bagi asosiasi Strombus sp. pada ekosistem lamun. Tujuan dari penelitian ini untuk mengidentifikasi tutupan lamun dan kelimpahan siput gonggong (Strombus sp.) dan mempelajari asosiasi siput gonggong (Strombus sp.) pada ekosistem lamun di pesisir Timur Pulau Bintan. Penelitian ini dilakukan di Pesisir Timur Pulau Bintan pada bulan Mei hingga Juni 2021 (Desa Teluk Bakau, Desa Malang Rapat dan Desa Berakit). Alat dan bahan yang digunakan dalam penelitian ini adalah GPS, transek kuadran 1x1 m, rol meter, timbangan digital, jangka sorong, multitester, hand refracstometer, pH meter, pipa paralon (20cm), sieve net, alat tulis dan alumunium foil. Metode sampling menggunakan 3 transek dengan panjang 100 m ke arah laut dengan jarak antar transek yaitu 50 m, dengan transek kuadran 1 x 1 m dimulai dari titik 0 sampai 100 m. Analisis data yang digunakan dalam penelitian ini yaitu tutupan lamun, kelimpahan Strombus sp., serta analisis PCA (Principal Component Analysis) yang menghubungkan antar variabel kelimpahan siput gonggong, tutupan lamun, parameter fisika kimia perairan dan substrat. Jenis Strombus sp. yang dijumpai diantaranya Strombus ","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47229637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Target strength Kuda Laut (Hippocampus comes) Terhadap Ukuran","authors":"Feren Rika Susanti, Dony Apdillah, Ita Karlina","doi":"10.14710/jkt.v25i2.13409","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13409","url":null,"abstract":"Seahorses are marine biota that have distinctive body characteristics that can be distinguished from other fish. Male seahorses have brood pouches. Estimation of the presence of seahorses is still very limited, an effective approach is needed to detect the presence of seahorses. The approach is carried out with an underwater acoustic approach to predict the presence of seahorses by looking at observations, namely the strength of the target. This study aims to analyze the value of Target Strength (TS) of seahorses based on size. The method used is the method of collecting experimental data. The seahorse used collected ten samples. The object placement method uses the ikat method. The TS response value was recorded using a Simrad EK-15 instrument with a frequency of 200kHz and morphometric measurements were performed. Morphometric measurements in the form of standard length measurements, seahorse head length to record acoustic signals in 3 conditions, namely females, non-pregnant males and pregnant males. Analysis of the relationship between the value of the target strength with seahorse morphometrics using statistical analysis, namely linear regression, ANOVA analysis and Tukey's follow-up test. The resulting seahorse is a species of Hippocampus. The distribution range of the resulting TS response values ranges from -58.38 dB to -67.75 dB. The result of this study is the influence of the measuring variable on the TS value formed  Kuda laut merupakan biota laut yang memiliki karakteristik tubuh unik  yang dapat di bedakan dari ikan lainnya. Pendugaan keberadaan kuda laut di alam masih sangat terbatas, saat ini masih menggunakan teknik visual statistik yang bersifat sampling point. Pendekatan underwater acoustic diperlukan untuk menduga keberadaan dari kuda laut di perairan, dibutukan informasi  nilai pantulan akustik yang dikenal dengan target strength. Penelitian ini bertujuan untuk menganalisis nilai Target strength (TS) dari kuda laut berdasarkan ukuran. Metode yang perekaman sinyal akustik pada lingkungan alami dari habitat kuda laut. Kuda laut yang digunakan berjumlah sepuluh sampel denan metode pemeruman menggunakan thetred method. Perekaman nilai respon TS menggunakan alat scientific echosounder Simrad EK-15 frekuensi 200kHz. Pengukuran morfometrik berupa pengukuran panjang standar, panjang kepala. Data akustik dianalisis dengan perangkat lunak Sonar-5 Pro, selanjutnya analisis statistik regresi linear. Hasil penelitian menujukan hubungan nilai target strength rata-rata berkisar antara -58,38 (SD±2,93) sampai dengan -67,75 dB (SD±1,26). Hubungan TS terhadap panjang standar (PS) menunjukan hubungan positif, semakin besar ukuran kuda laut maka semakin besar pula nilai TS. Dengan formulasi TS = 20,62 log10 (PS) – 84,32 [dB], dengan koefisien determinasi  sebesar 14,1 %. Sementara itu hubungan TS terhadap Panjang Kepala (PK) diformulasikan menjadi TS = 11,43 log10 (PK) – 67,72 [dB] dengan koefisien determinasi 4,1 % lebih rendah dibandingkan den","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44446285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Karakteristik Biofilm Komposit CMC- Gliserol-Alginat dari Sargassum sp pada Perlakuan dengan Kalsium Klorida","authors":"A. Ridlo, S. Sedjati, E. Supriyantini, O. K. Putri","doi":"10.14710/jkt.v25i2.13773","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13773","url":null,"abstract":"Bioplastics are plastics made from renewable raw materials such as polysaccharides, proteins and lipids. One of the alternative sources of bioplastic raw materials is hydrocolloid from seaweed, which is abundantly available in Indonesia, so that this hydrocolloid-based bioplastic is very prospective to be developed, and can increase the added value of seaweed. The physical and mechanical properties of alginate bioplastics can be improved by combining them with other materials into biocomposite materials that have superior properties and meet specifications. This study aims to determine the effect of calcium chloride (CaCl2) on the physical and mechanical properties of the CMC-Glycerol-Alginate composite bioplastic from Sargassum sp. Bioplastics were made by mixing 0.5 g of alginate flour, added CMC (1.5 g), and 100 ml of distilled water, then stirred with a magnetic stirrer for 10 minutes at 90oC. After that, the temperature was lowered to 40oC and 5 ml of glycerol was added and then homogenized again for 15 minutes. The mixture was filtered and then poured into a glass mold and the surface was leveled using a stainless steel cylinder, then dried in an oven at 80oC for 12 hours. After that the bioplastic is released from the glass plate. In the soaking method, the bioplastic sheets were immersed in a 2% CaCl¬2 solution for 5 minutes, then dried and stored in a desiccator. In the mixing method, 1 gram of CaCl¬2 was put directly into the alginate-CMC-glycerol mixture and homogenized with a magnetic stirrer at 90oC for 15 minutes, then printed on a glass plate, then dried at 100oC for 12 hours. CaCl2 treatment by mixing and soaking decreased elongation, tensile strength, biodegradability and transparency, but increased water resistance and thickness of the alginate-CMC-glycerol composite bioplastic, and changed the surface properties of the bioplastic to be rougher. No new functional groups were formed due to the interaction between alginate, CMC, glycerol, distilled water and CaCl2.  Bioplastik adalah plastik yang dibuat dari bahan baku terbarukan seperti polisakarida, protein dan lipida. Salah satu alternatif sumber bahan baku bioplastik adalah hidrokoloid dari rumput laut yang tersedia melimpah di Indonesia, sehingga bioplastik berbahan hidrokoloid ini sangat prospektif untuk dikembangkan, serta dapat meningkatkan nilai tambah rumput laut.Sifat fisik dan mekanik bioplastik alginat dapat ditingkatkan dengan cara dikombinasi dengan bahan lain menjadi material biokomposit yang memiliki sifat unggul dan memenuhi spesifikasi.Penelitian ini bertujuan untuk mengetahui pengaruh kalsium klorida (CaCl2) terhadap sifat fisik dan mekanik bioplastik komposit CMC- Gliserol-Alginat dari Sargassum sp.Bioplastik dibuat mdengan mencampurkan tepung alginat sebanyak 0,5 g ditambahkan CMC ( 1,5 g), dan akuades 100 ml, lalu diaduk dengan magnetic stirrer selama 10 menit pada suhu 90oC. Setelah itu, suhu diturunkan sampai 40oC dan ditambahkan gliserol 5 ml lalu dihomog","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43688134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gastropoda Telescopium telescopium (Linnaeus, 1758) di Hutan Mangrove Desa Cut Mamplam Provinsi Aceh, Indonesia","authors":"Ida Marina Harahap, S. Syahrial, Erniati Erniati, Erlangga Erlangga, I. Imanullah, Riri Ezrneti","doi":"10.14710/jkt.v25i2.13353","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13353","url":null,"abstract":"The growth of an organism can provide fundamental ecological data and serve as a primary parameter for describing an organism's population dynamics. Telescopium telescopium gastropods were studied in September 2021 using purposive sampling in the mangrove forest of Cut Mamplam Village, Aceh Province. This study aims to provide fundamental data for mangrove management in Indonesia. Data were collected by creating a 40 m perpendicular to the coastline line transect, followed by 10 x 10 m sample plots and five 1 x 1 m sub plots. Following the collection of samples, additional analysis of the density, length and weight relationship, demographic structure, spatial distribution patterns based on the Morisita index, and growth characteristics were conducted as unique characteristics when compared to T. telescopium in other areas analyzed using PCA. The study's findings indicated that the density was low (< 7 ind/m2), the allometric length and weight relationship was negative (b < 3), the dominant growth demographic structure was mature (dominant SL 79.36 – 86.34 mm), the distribution pattern was clustered (Iδ = 02.75), and the BT, BWL, and AL morphometrics, in particular, had a variance of 95.91%. Pertumbuhan suatu organisme dapat menyediakan data ekologi dasar dan merupakan salah satu parameter yang utama dalam mengambarkan dinamika populasi suatu organisme, sehingga kajian gastropoda Telescopium telescopium di hutan mangrove Desa Cut Mamplam Provinsi Aceh dilakukan menggunakan purposive sampling pada bulan September 2021 dengan tujuan sebagai data dasar dalam pengelolaan mangrove di Indonesia, dimana data dikumpulkan dengan cara membuat transek garis sepanjang 40 m tegak lurus garis pantai, kemudian dibuat petak-petak contoh berukuran 10 x 10 m dan selanjutnya dibuat sub plot berukuran 1 x 1 m sebanyak 5 sub plot. Setelah sampel terkumpul, selanjutnya dilakukan analisis kepadatan, hubungan panjang berat tubuh, struktur demografi, pola penyebaran spasial berdasarkan indeks Morisita dan karakteristik pertumbuhannya sebagai penciri khusus bila dibandingkan dengan T. telescopium di kawasan lain yang dianalisis menggunakan PCA. Hasil kajian memperlihatkan bahwa kepadatannya rendah (< 7 ind/m2), hubungan panjang beratnya allometrik negatif (b < 3), struktur demografi pertumbuhan yang dominan ditemukan tergolong dewasa (SL dominan 79.36 – 86.34 mm), pola penyebarannya mengelompok (Iδ = 02.75) dan morfometrik BT, BWL maupun AL sebagai penciri khususnya memiliki varian 95.91%.  ","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41839538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Status Konservasi dan Keanekaragaman Jenis Ikan yang Diperdagangkan di Pasar Ikan Tradisional di Bali","authors":"I. N. Putra, Elok Faiqoh, I. Wiratama","doi":"10.14710/jkt.v25i2.13610","DOIUrl":"https://doi.org/10.14710/jkt.v25i2.13610","url":null,"abstract":"The high demand for fish for local consumption and export has led to overfishing and increased the trade of fish that are prohibited by law and international agreements. Therefore, this study aims to calculate species diversity and determine the conservation status of fish traded in traditional fish markets in Bali. Field sampling was carried out at fish markets located in Badung, Buleleng, Karangasem, and Jembrana. Samples are identified to the lowest taxa level that can be determined, based on morphological characters. Diversity parameters such as the Shannon diversity index (H), Simpson (Simp), Fisher Alpha, Species richness (S) and Pielou's evenness (J) were calculated using the Rstudio while the determination of conservation status refers to the IUCN Red List. The number of fish samples collected was 69 individuals from 23 families. Of the total 69 individuals, 61 individuals were successfully identified to species level, while the rest of it were identified to the genus level. The results showed that the family of Labridae/wrasses has the highest number of species (9 species) followed by Clupeidae and Scombridae (7 species each). The result of diversity indices showed that the Kedonganan fish market (Badung) has the highest diversity. Evaluation of the conservation status of traded fish showed that 80% of the traded fish species are still in LC (Least Concern) status, although one species identified as bigeye tuna, Thunnus obesus, is known to have VU (Vulnerable) status.   Tingginya permintaan ikan untuk konsumsi lokal maupun ekspor menyebabkan terjadinya overfishing dan meningkatkan perdagangan ikan-ikan yang dilarang oleh undang-undang maupun kesepakatan internasional. Oleh sebab itu, penelitian ini bertujuan untuk menghitung keanekaragaman jenis dan menentukan status konservasi ikan yang diperdagangkan di pasar ikan tradisional di Bali. Pengambilan sampel dilakukan di pasar ikan yang terletak di kabupaten Badung, Buleleng, Karangasem, dan Jembrana. Sampel diidentifikasi sampai pada level taksa terendah yang bisa ditentukan, berdasarkan pada karakter morfologi. Parameter keanekaragaman seperti indeks keanekaragaman Shannon (H), Simpson (Simp), Fisher Alpha, Species richness (S) dan Pielou’s evenness (J) dihitung dengan Rstudio sedangkan penentuan status konservasi mengacu pada IUCN RedList. Jumlah sampel ikan yang dikumpulkan sebanyak 69 individu dari 23 famili. Dari total 69 individu, 61 individu berhasil diidentifikasi sampai pada level spesies sedangkan sisanya sampai level genus. Hasil penelitian menunjukkan bahwa Famili Labridae/wrasses memiliki jumlah spesies terbanyak (9 spesies) disusul oleh Clupeidae dan Scombridae (masing-masing 7 spesies). Hasil analisis keanekaragaman menunjukkan bahwa pasar ikan Kedonganan (Badung) memiliki keanekaragaman tertinggi. Evaluasi terhadap status konservasi ikan yang diperdagangkan menunjukkan bahwa 80% jenis ikan yang diperdagangkan masih dalam status LC (Least Concern) meskipun ditemukan juga sat","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47505659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}