Acta Aquatica: Aquatic Sciences Journal最新文献_第10页

Peningkatan Kepadatan Thalassiosira sp dengan Dosis Pupuk Silikat yang Berbeda sp - talassira密度增加与微量硅酸盐肥料剂量不同

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-12-01 DOI: 10.29103/aa.v8i3.5858

Erlangga Erlangga, Ayu Andira, Erniati Erniati, Mahdaliana Mahdaliana, Muliani Muliani

{"title":"Peningkatan Kepadatan Thalassiosira sp dengan Dosis Pupuk Silikat yang Berbeda","authors":"Erlangga Erlangga, Ayu Andira, Erniati Erniati, Mahdaliana Mahdaliana, Muliani Muliani","doi":"10.29103/aa.v8i3.5858","DOIUrl":"https://doi.org/10.29103/aa.v8i3.5858","url":null,"abstract":"The research was conducted in 11-25 July 2020 at Water Quality and Fish Nutrition Laboratory, Faculty of Agriculture, University of Malikussaleh. The research design used was Completely Randomized Design (CRD) non factorial with 4 treatments and 3 replications. With treatment A: culture of Thalassiosira sp with 15 ppm silicate fertilizer, treatment B: culture of Thalassiosira sp with 17 ppm silicate fertilizer, treatment C: culture of Thalassiosira sp with 19 ppm silicate fertilizer, treatment D: culture of Thalassiosira sp with 21 ppm silicate fertilizer. The result showed that the effect of silicate fertilizer with different dosage gave a different significant to cells Thalassiosira sp density and significantly different to cells Thalassiosira sp peak populasion. The highest average cell density value was found in treatment A (15 ppm) of 419,10 x 104 cells/ml, then treatment B (17 ppm) of 256,67 x 104 cells/ml, followed by treatment C (19 ppm) of 216,29 x 104 cells/ml and treatment D (21 ppm) of 102,90 x 104 cells/ml. The highest cell populasion peak is found in treatment A (15 ppm) of 689,67 x 104 cells/ml, then treatment B (17 ppm) of 389,33 x 104 cells/ml, followed by treatment C (19 ppm) of 388 x 104 cells/ml and treatment D (21 ppm) of 156 x 104 cells/ml. the water quality of the study in standard condision is pH 6,9-8, salinity 32 ppt, light intensity 800-2500 lux, and temperature 25-290C.Keywords: Density, Thalassiosira, silicate","PeriodicalId":431784,"journal":{"name":"Acta Aquatica: Aquatic Sciences Journal","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115181669","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}

引用次数: 0

Evaluasi Pakan Alami yang Berbeda Terhadap Maturasi Lobster Air Tawar (Cherax quadricarinatus) 对淡水龙虾的天然饲料(切拉克斯四轴动物)的不同评价

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-12-01 DOI: 10.29103/aa.v8i3.6030

Nurullah Fatwana, S. Komariyah, Rosmaiti Rosmaiti, Iwan Hasri

引用次数: 0

The Influence of Feeding Combination Silkworm (Tubifex sp.) with Commercial Feed on Growth Performance of Catfish (Clarias sp.) 家蚕(Tubifex sp.)与商品饲料组合饲喂对鲇鱼(Clarias sp.)生长性能的影响

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-08-06 DOI: 10.29103/AA.V8I2.4776

D. Agustina, R. Mukti

引用次数: 0

Growth, Mortality and Exploitation Rate of Pagellus bellottii Harvested from the Marine Territorial Waters of Sierra Leone 塞拉利昂海洋领海捕捞的贝洛蒂Pagellus bellottii的生长、死亡率和开采率

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-08-06 DOI: 10.29103/AA.V8I2.4774

K. J. Konoyima, L. D. Seisay

{"title":"Growth, Mortality and Exploitation Rate of Pagellus bellottii Harvested from the Marine Territorial Waters of Sierra Leone","authors":"K. J. Konoyima, L. D. Seisay","doi":"10.29103/AA.V8I2.4774","DOIUrl":"https://doi.org/10.29103/AA.V8I2.4774","url":null,"abstract":"The study investigated growth, mortality and exploitation rate of Pagellus bellottii collected off Sierra Leone, aimed to support efficient management of its stock. A total of 8, 216 specimens of Pagellus bellottii were collected at random from January-November, 2016 on-board a demersal trawler. Data analysis employed methods implemented in the computerized FiSAT II software using pooled length-frequencies in constant class size. Growth parameters gave asymptotic length (L∞ = 33.63cm), growth rate (K = 0.63yr-1), growth performance index (ɸ = 2.85), theoretical age (to = -0.6years) and life-span (tmax = 5.50years) whereas the length (Lm50) and age (tm50) at first maturity were estimated as 22.40 cm and 2.30years respectively. Besides, the current fishing mortality rate (F = 6.58yr-1) exceeded the optimum (Fopt = 0.50yr-1), limiting (Flimit = 0.81yr-1) and natural (M = 1.22yr-1) mortality rates, and the current exploitation rate (Ecurrent) was 0.84yr-1. Results depicted low life expectancy, fast growth and late first maturity (Lm50 = 33.4%, but < L∞) in Pagellus bellottii. Also, the stock of P. bellottii was overexploited (Ecurrent > 0.5), buttressed by the alarming current fishing mortality beyond optimal and permissible limits. This was very worrisome and the current exploitation rate should be reduced to 0.5yr-1 (40.5%) and fishing mortality rate to 0.5yr-1 (92.4%) in order to achieve at least optimal level of exploitation (Ecurrent = 0.5) and fishing mortality rate (Fcurrent = Fopt) respectively, through institution of closed fishing seasons and reduction in fleets targeting the species.Keywords: Exploitation; growth; life-span; mortality; stock ","PeriodicalId":431784,"journal":{"name":"Acta Aquatica: Aquatic Sciences Journal","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134389973","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}

引用次数: 1

Contribution to the current list of Nitzschia species (Bacillariophyceae) in Malaysia 对马来西亚尼氏菌种类(芽孢杆菌科)的当前列表的贡献

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-08-06 DOI: 10.29103/AA.V8I2.4777

Suriyanti Su Nyun Pau, D. Nasir, G. Usup

{"title":"Contribution to the current list of Nitzschia species (Bacillariophyceae) in Malaysia","authors":"Suriyanti Su Nyun Pau, D. Nasir, G. Usup","doi":"10.29103/AA.V8I2.4777","DOIUrl":"https://doi.org/10.29103/AA.V8I2.4777","url":null,"abstract":"Current occurrence of Nitzschia Hassall from marine and freshwater environment in Malaysia is compiled from current and previously published materials. Phytoplankton was collected using a 20 µm plankton net from waterfronts of Peninsular Malaysia and Borneo. Some Nitzschia cells were successfully isolated and established into clonal cultures. For morphology observation, organic matters of the net samples and cultures were oxidized and removed through acid treatment. Cleaned specimens were observed using light and electron microscopes. The morphology of the Nitzschia cells was described and micrographs are included. In addition to current field sampling, Nitzschia spp. records and distributions in Malaysia had also been compiled from secondary data. Sources of references whereby the Nitzschia species were listed in this article were cited accordingly. This article compiles a total of 11 Nitzschia spp. found in Malaysia including a few revisions and new records. This article could serve as an important reference for Nitzschia taxonomic and distributional study particularly in tropical region.Keywords: distribution, morphology, taxonomy, tropical","PeriodicalId":431784,"journal":{"name":"Acta Aquatica: Aquatic Sciences Journal","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124225928","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}

引用次数: 0

Komunitas makrozoobentos dan kaitannya dengan kualitas air aliran sungai Senggarang, Kota Tanjungpinang makrozoobentos社区及其与坦永平市Senggarang的水质有关

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-08-06 DOI: 10.29103/AA.V8I2.4782

Aknes Safitri, W. R. Melani, Wahyu Muzammil

{"title":"Komunitas makrozoobentos dan kaitannya dengan kualitas air aliran sungai Senggarang, Kota Tanjungpinang","authors":"Aknes Safitri, W. R. Melani, Wahyu Muzammil","doi":"10.29103/AA.V8I2.4782","DOIUrl":"https://doi.org/10.29103/AA.V8I2.4782","url":null,"abstract":"Senggarang is one of the coastal villages in Tanjungpinang City which has a river that flows from the upstream downstream into the sea. The flow of the Senggarang river has distinctive characteristics that are commonly found in small island waters, namely having a relatively short upstream to downstream distance, and the downstream part is influenced by tidal conditions. Various activities along the Senggarang river flow would cause changes in water quality which would impact the presence of macrozoobenthic. The objective of this study was to determine the relationship between the macrozoobenthic community and the water quality of the Senggarang river. Macrozoobenthic sampling, and environmental parameters were carried out using random sampling methods. The results of this study were obtained 27 species from 6 phylum, namely phylum Arthropoda 13 species, phylum Ciliophora 3 species, phylum Echinodermata 1 species, phylum Mollusca 4 species, phylum Nematoda 5 species, and phylum Tardigrada 1 species. The average macrozoobenthic density is 172 ind./ m3 for freshwater and 704 ind./ m3 for brackish waters. The average diversity value for freshwater is 1.29 and 2.16 waters with medium salinity, the average uniformity value of 0.85 freshwater and 0.94 of high in brackish waters, the average dominance value of 0.32 freshwater and 0.13 of low in brackish waters. The relationship of macrozoobenthos with the quality of freshwater based on PCA analyses related to temperature and dissolved oxygen, in brackish waters to temperature, dissolved oxygen, and current.Keywords: Macrozoobenthic community, PCA, River flow, Water quality","PeriodicalId":431784,"journal":{"name":"Acta Aquatica: Aquatic Sciences Journal","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125510680","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}

引用次数: 3

The rhetorical blue economy in Bangladesh: Analyzing the inborn regulatory bottlenecks 孟加拉华丽的蓝色经济:先天监管瓶颈分析

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-08-06 DOI: 10.29103/AA.V8I2.4775

Md Mizanur Rahman

引用次数: 9

First Observation of the Nocturnal Cleaning Relationship between Common Octopus Octopus vulgaris (Cuvier, 1797), and Indo-Pacific Palaemonid Shrimp, Urocaridella pulchella Yokeş & Galil, 2006 from the Iskenderun Bay, Eastern Mediterranean Coast of Turkey 普通章鱼(Octopus vulgaris，居维叶，1797年)和印太古虾(Indo-Pacific Palaemonid Shrimp, Urocaridella pulchella yokeak & Galil, 2006年)夜间清洁关系的首次观察来自土耳其地中海东岸Iskenderun湾

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-08-06 DOI: 10.29103/AA.V8I2.4780

D. Ergüden, D. Ayas, Necdet Uyğur

引用次数: 0

Occurrence of the Histioteuthis reversa (Verrill 1880), (Cephalopoda/Histioteuthidae) in the Gulf of Mersin/ Turkey (头足纲/头足科)在土耳其梅尔辛湾的出现

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-08-06 DOI: 10.29103/AA.V8I2.4783

M. Gökoğlu, Serkan Teker, J. Korun

引用次数: 2

Kajian kinerja pertumbuhan dan kelangsungan hidup ikan kerapu macan (Ephinephelus fuscogusttatus) menggunakan pakan hewani yang berbeda 虎斑鱼(Ephinephelus fuscogusttatus)的生长和生存研究采用了不同的动物饲料

Acta Aquatica: Aquatic Sciences Journal Pub Date : 2021-08-06 DOI: 10.29103/AA.V8I2.4785

Munawwar Khalil, Salamah Salamah, Zumairi Zumairi, Muliani Muliani

{"title":"Kajian kinerja pertumbuhan dan kelangsungan hidup ikan kerapu macan (Ephinephelus fuscogusttatus) menggunakan pakan hewani yang berbeda","authors":"Munawwar Khalil, Salamah Salamah, Zumairi Zumairi, Muliani Muliani","doi":"10.29103/AA.V8I2.4785","DOIUrl":"https://doi.org/10.29103/AA.V8I2.4785","url":null,"abstract":"The tiger grouper (Epinephelus fuscoguttatus) is an economically important fish whose fry still relies on natural catches. Several species of grouper are very potential to be cultivated because of their fast growth, efficient feed conversion, and high selling value. The purpose of this study is growth performance and survival rate tiger grouper (Epinephelus fuscoguttatus) used different live feed. The research design used in this study was a Completely Randomized Design with 3 treatments 3 replications and continued with LSD test if there were differences. The treatments given are treatment A (Snail), treatment B (Chicken Intestine), and treatment C (Caterpillar Maggot). Parameters observed were length increase, weight gain, survival, feed response, and water quality. The results of this study indicate that the highest increase was found in the treatment of C: 4,04 cm and the lowest was in treatment B: 3 cm, the highest weight gain was found in the treatment of C: 3,73 grams, and the lowest was in treatment B: 2,18 grams. The survival rate for all treatments is 100%. During this study the temperature ranged (28.6-31.8 oC), pH (6.7-8.2), DO (6.3-8.1 ppm), and salinity (23-27 ppt).Keywords: growth, live feed, survival rate, tiger grouper.","PeriodicalId":431784,"journal":{"name":"Acta Aquatica: Aquatic Sciences Journal","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116741599","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}

引用次数: 1