Tropical life sciences research最新文献_第9页

Physicochemical Properties of Honey from Contract Beekeepers, Street Vendors and Branded Honey in Sabah, Malaysia. 马来西亚沙巴州合同养蜂人、街头小贩和品牌蜂蜜的理化性质。

IF 1.4

Tropical life sciences research Pub Date : 2022-09-01 DOI: 10.21315/tlsr2022.33.3.5

A H Robin Lim, Lum Mok Sam, Januarius Gobilik, Kimberly Ador, Jamilah Lee Nyuk Choon, Jonal Majampan, Suzan Benedick

{"title":"Physicochemical Properties of Honey from Contract Beekeepers, Street Vendors and Branded Honey in Sabah, Malaysia.","authors":"A H Robin Lim, Lum Mok Sam, Januarius Gobilik, Kimberly Ador, Jamilah Lee Nyuk Choon, Jonal Majampan, Suzan Benedick","doi":"10.21315/tlsr2022.33.3.5","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.3.5","url":null,"abstract":"The chemical properties of honey depend on the source of collection to packaging, but little is known about honey in Sabah. The aim of this study was to distinguish between the physicochemical properties and mineral content of 76 honey samples from local sources and supermarkets in Sabah, which were from contract beekeepers, unknown sources and branded honey. Raw honey was collected from contract beekeepers, while honey from unknown source was obtained from street vendors and wet markets, while branded honey was purchased from local supermarkets. The chemical parameters of the honey were assessed using established methods, while the mineral content of the honey was determined using inductively coupled plasma optical emission spectroscopy (ICP-OES). Significant differences were found in several parameters measured in honey from different sources, with principal component analysis (PCA) showing clear separation between the measured parameters, yielding five factors that accounted for up to 72.25% of the total explained variance. Honey from contract beekeepers showed significant differences and higher mineral content (Ca, Cu, Fe, K, Mg, Na and Zn) compared to honey from unknown source and branded honey. Potassium was the most important element in the study with an average of 2.65 g/kg and 629.4 mg/kg for sources from contract beekeepers and branded honey, respectively. The honey from the contract beekeepers was of better quality due to its high mineral content. The results suggest that honey from contract beekeepers could be a good choice when it comes to high mineral content.","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9747107/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10411624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The Potential of Phylogenetically Diverse Culturable Actinobacteria from Litopenaeus vannamei Pond Sediment as Extracellular Proteolytic and Lipolytic Enzyme Producers. 凡纳滨对虾池塘沉积物中可培养放线菌作为细胞外蛋白水解酶和脂肪水解酶的潜力。

IF 1.4

Tropical life sciences research Pub Date : 2022-09-01 DOI: 10.21315/tlsr2022.33.3.10

Diah Ayuningrum, Aninditia Sabdaningsih, Oktavianto Eko Jati

{"title":"The Potential of Phylogenetically Diverse Culturable Actinobacteria from Litopenaeus vannamei Pond Sediment as Extracellular Proteolytic and Lipolytic Enzyme Producers.","authors":"Diah Ayuningrum, Aninditia Sabdaningsih, Oktavianto Eko Jati","doi":"10.21315/tlsr2022.33.3.10","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.3.10","url":null,"abstract":"Enzymes are catalysts that can increase the reaction time of a biochemical process. Hydrolytic enzymes have a pivotal role in degrading organic waste in both terrestrial and aquatic environments. The aims of this study were (1) to investigate the ability of actinobacteria isolated from Litopenaeus vannamei pond sediment to produce proteolytic and lipolytic enzymes, (2) to identify promising candidates using 16S rRNA gene amplification, and (3) to construct a phylogenetic tree based on the 16S rRNA genes. A skim milk agar medium was used in the preliminary experiment of the proteolytic assay, and a Tween 20/80 medium was used in the lipolytic assay. Fifteen and 20 (out of 40) actinobacterial isolates showed great potential for proteolytic and lipolytic activities, respectively. Furthermore, four actinobacteria isolates produced both enzyme types with proteolytic and lipolytic index scores of 1-6.5. The most promising candidates were SA 2.2 (IM8), SC 2.1 (IM6), SD 1.5 (IM6) and SE 1.1 (IM8). BLAST homology results showed a high similarity between the actinobacteria isolates and Streptomyces verucosisporus, S. mangrovicola, S. barkulensis and Nocardiopsis lucentensis, respectively. Therefore, actinobacteria from Litopenaeus vannamei pond sediment are high-potential proteolytic and lipolytic enzyme producers.","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9747105/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10411182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

First Report on Wild Ginger (Family: Zingiberaceae) Species Composition with New Records in Limestone Forests of Kelantan, Peninsular Malaysia. 马来西亚半岛吉兰丹石灰岩森林野生姜(姜科)物种组成新记录初报。

IF 1.4

Tropical life sciences research Pub Date : 2022-09-01 DOI: 10.21315/tlsr2022.33.3.3

Suganthi Appalasamy, Nivaarani Arumugam, Nor Syahaiza Ahmad Zamri, Anis Fadhlina, Jayaraj Vijaya Kumaran, Sreeramanan Subramaniam

{"title":"First Report on Wild Ginger (Family: Zingiberaceae) Species Composition with New Records in Limestone Forests of Kelantan, Peninsular Malaysia.","authors":"Suganthi Appalasamy, Nivaarani Arumugam, Nor Syahaiza Ahmad Zamri, Anis Fadhlina, Jayaraj Vijaya Kumaran, Sreeramanan Subramaniam","doi":"10.21315/tlsr2022.33.3.3","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.3.3","url":null,"abstract":"The wild gingers in the family Zingiberaceae have a wide range of habitat distribution. The species growing in Malaysian forests are the most studied. Nevertheless, the aromatic perennial herb family found in limestone forests is the least studied. The present study identified the ginger species compositions, determined the conservation status of the identified ginger species, and compared the distribution of the ginger species in selected limestone forests of Kelantan due to the lack of intensive study focusing on wild gingers in Malaysian limestone forests, especially in the state of Kelantan, to date. In various months, wild ginger species observation was conducted at four limestone forests in Kelantan. From the survey performed during the present study, Gua Setir and Gua Ikan recorded 16 species with 12.5% overlapping species. Gua Setir comprised 61.5% more ginger species than Gua Ikan. In total, 13 species (81.25%) were evaluated based on the Red List of Threatened Species by the International Union for Conservation of Nature (IUCN). Three wild ginger species listed as high conservation value (HCV), Zingiber aurantiacum, Zingiber petiolatum and Zingiber wrayi, were identified at the limestone karst valley of Gua Setir. The current study presented updated and new records of the limestone wild ginger flora in Kelantan. The research also demonstrated that each limestone forest consisted of different combinations of ginger species. Consequently, conservation efforts and sustainable management currently enforced in the limestone forests would lead to long-term protection of the plants. Furthermore, the wild gingers could become a tourist attraction for limestone forests located in recreational areas.","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9747101/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10411622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Bioprospecting and Diversity of Yeast Producing Ethanol Isolated from Indonesia. 印度尼西亚产乙醇酵母菌的生物勘探及其多样性。

IF 1.4

Tropical life sciences research Pub Date : 2022-09-01 DOI: 10.21315/tlsr2022.33.3.1

Eny Ida Riyanti, Rafika Yuniawati, Edy Listanto

{"title":"Bioprospecting and Diversity of Yeast Producing Ethanol Isolated from Indonesia.","authors":"Eny Ida Riyanti, Rafika Yuniawati, Edy Listanto","doi":"10.21315/tlsr2022.33.3.1","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.3.1","url":null,"abstract":"Bioethanol is considered the most environmentally friendly as renewable fuels. Indonesia has abundant microbe diversity which is potential for bioprospecting such as fermenting agents using agriculture product as raw materials for producing bioethanol. This study aims to isolate, characterise and molecular identify of 15 isolates of bioethanol-producing yeasts from various sources. Characterisation based on ethanol production, cell morphology and various substrate utilisation has been carried out. Molecular characterisation of 15 yeast isolates using tree sets of primers had been carried out. Amplification in the internal area of transcribe spacers (ITS) was successfully carried out with an amplitude of 400 bp-900 bp. Amplifiers in the D1/D2 26s rDNA domain are 250 bp. Amplification with ScerF2 and ScerR2 specific primers was carried out successfully and proved that there were two isolates which were not Saccharomyces cerevisiae analysis of yeast genetic diversity showed 12 yeast isolates classified as S. cerevisiae and the rest belonged to the genus Clavispora, Candida and Kodamaea (Pichia).","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9747104/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10424563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Molecular Diversity of Microbes Associated with Fermented Bamboo Shoots. 发酵竹笋相关微生物的分子多样性

IF 1.1

Tropical life sciences research Pub Date : 2022-09-01 Epub Date: 2022-09-30 DOI: 10.21315/tlsr2022.33.3.9

Vijay Kumar, Bindu Naik, Sachin Sharma, Akhilesh Kumar, Javed Masood Khan, Mohammad Irfan

引用次数: 0

Diversity and Abundance of Soil Collembola during GM Rice Overexpressing Cry1B-Cry1Aa Cultivations at Four Confined Field Trials in West Java. 西爪哇转基因水稻Cry1B-Cry1Aa过表达栽培土壤线虫的多样性和丰度

IF 1.4

Tropical life sciences research Pub Date : 2022-09-01 DOI: 10.21315/tlsr2022.33.3.6

Yayuk Rahayuningsih Suhardjono, Amy Estiati, Syamsidah Rahmawati, Satya Nugroho

{"title":"Diversity and Abundance of Soil Collembola during GM Rice Overexpressing Cry1B-Cry1Aa Cultivations at Four Confined Field Trials in West Java.","authors":"Yayuk Rahayuningsih Suhardjono, Amy Estiati, Syamsidah Rahmawati, Satya Nugroho","doi":"10.21315/tlsr2022.33.3.6","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.3.6","url":null,"abstract":"Collembola (springtails) is an important soil biology indicator to monitor toxicity or ecological disturbances in the ecosystem. The impact of Bacillus thuringiensis (Bt) rice cv Rojolele events expressing Cry1B-Cry1Aa driven by the maize ubiquitin promoter resistant to yellow rice stem borer (YSB, Scirpophaga incertulas Walker) on non-target Collembola community was assessed. The experiment was performed at four locations under confined field trials according to the Indonesia's environmental safety regulation on genetically engineered crops. Six transgenic rice events were tested with non-transgenic Rojolele and the moderately resistant IR42 rice varieties as controls. The experimental design was randomised block design with three replicates. Collembola were collected from the bunds between plots using pitfall and Berlese funnel traps at seedling, vegetative and generative stages, as well as at harvesting time. The results showed that Collembola abundance and diversity were significantly affected by both experimental sites and observation times. However, no significant differences in Collembola diversity and abundance between Bt rice and non-Bt controls were observed. Thus, we can conclude that the cultivation of the Bt rice cv Rojolele events expressing Cry1B-Cry1Aa protein fusion do not adversely affect biodiversity and abundance of Collembola at the four confined rice fields.","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9747110/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10418433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flagellin from Salmonella enteritidis Enhances the Immune Response of Fused F18 from Enterotoxigenic Escherichia coli. 肠炎沙门氏菌鞭毛蛋白增强产肠毒素大肠杆菌融合F18的免疫应答。

IF 1.4

Tropical life sciences research Pub Date : 2022-09-01 DOI: 10.21315/tlsr2022.33.3.2

An-Phuc Tran-Mai, Hong-Diep Thi Tran, Quoc-Gia Mai, Kien-Quang Huynh, Thuoc Linh Tran, Hieu Tran-Van

{"title":"Flagellin from Salmonella enteritidis Enhances the Immune Response of Fused F18 from Enterotoxigenic Escherichia coli.","authors":"An-Phuc Tran-Mai, Hong-Diep Thi Tran, Quoc-Gia Mai, Kien-Quang Huynh, Thuoc Linh Tran, Hieu Tran-Van","doi":"10.21315/tlsr2022.33.3.2","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.3.2","url":null,"abstract":"F18 plays an important role in helping Enterotoxigenic Escherichia coli (ETEC) binds to specific receptors on small intestinal enterocytes, followed by secreting of toxins causing diarrhea in post-weaning piglets (post-weaning diarrhea, PWD). However, the F18 subunit vaccine is not sufficient to stimulate an immune response that can protect weaning pigs from F18-positive ETEC (F18+ETEC). Recently, a body of evidence shows that flagellin protein (FliC) helps to increase the immunity of fused proteins. Therefore, in this study, we combined FliC with F18 to enhance the immune response of F18. The f18 gene was obtained from F18+ETEC, then was fused with the fliC gene. The expression of recombinant FliC-F18 protein was induced by Isopropyl-beta-D-Thiogalactopyranoside (IPTG). The purified protein was tested in vivo in mouse models to evaluate the immunostimulation. Results showed that the fusion of FliC and F18 protein increased the production of anti-F18 antibodies. Besides, the anti-F18 antibody in the collected antiserum specifically identified F18+ETEC. This result provides proof-of-concept for the development of subunit vaccine to prevent PWD using F18 antigen.","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9747111/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10418435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing the Suitability of Habitats for Porphyrio porphyrio indicus and Amaurornis phoenicurus in Urban Wetlands of Peninsular Malaysia. 马来西亚半岛城市湿地紫斑蝶和凤梨生境适宜性评价

IF 1.4

Tropical life sciences research Pub Date : 2022-07-01 Epub Date: 2022-07-15 DOI: 10.21315/tlsr2022.33.2.3

Oluwatobi E Olaniyi, Chukwuemeka O Martins, Mohamed Zakaria

{"title":"Assessing the Suitability of Habitats for Porphyrio porphyrio indicus and Amaurornis phoenicurus in Urban Wetlands of Peninsular Malaysia.","authors":"Oluwatobi E Olaniyi, Chukwuemeka O Martins, Mohamed Zakaria","doi":"10.21315/tlsr2022.33.2.3","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.2.3","url":null,"abstract":"It becomes imperative to understand the eco-climatic predictors and know the suitable habitat for Porphyrio porphyrio indicus and Amaurornis phoenicurus in the urban wetlands to prevent their local extinction. The study explored the habitat suitability for Porphyrio porphyrio indicus and Amaurornis phoenicurus in Paya Indah wetlands and Putrajaya wetlands of Peninsular Malaysia. Porphyrio porphyrio indicus and Amaurornis phoenicurus surveyed using the point count technique, and a stratified random design. The maximum entropy modelling (MEM) approach and geographic information systems employed to determine the influence of 17 eco-climatic factors on the suitable habitats for the species. Water at a minimum depth (44.30%) and rainfall (74.20%) contributed to the availability of suitable habitats for Porphyrio porphyrio indicus in Paya Indah and Putrajaya wetlands. Also, dissolved oxygen (56.60%) and salinity (43.50%) contributed to habitat suitability for Amaurornis phoenicurus in Paya Indah and Putrajaya wetlands. Large portions of the two urban wetlands were unsuitable for the Porphyrio porphyrio indicus and Amaurornis phoenicurus populations because of several eco-climatic factors. Thus, the models as management tools with a robust population monitoring database and framework would enhance the management effectiveness of the two species and urban wetlands.","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9354900/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40413422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Genome-Wide Identification, Characterisation and Phylogenetic Analysis of 52 Striped Catfish (Pangasianodon hypophthalmus) ATP-Binding Cassette (ABC) Transporter Genes. 52个条纹鲶鱼atp结合盒(ABC)转运体基因的全基因组鉴定、表征和系统发育分析。

IF 1.4

Tropical life sciences research Pub Date : 2022-07-01 Epub Date: 2022-07-15 DOI: 10.21315/tlsr2022.33.2.12

Leonard Whye Kit Lim, Hung Hui Chung, Han Ming Gan

{"title":"Genome-Wide Identification, Characterisation and Phylogenetic Analysis of 52 Striped Catfish (Pangasianodon hypophthalmus) ATP-Binding Cassette (ABC) Transporter Genes.","authors":"Leonard Whye Kit Lim, Hung Hui Chung, Han Ming Gan","doi":"10.21315/tlsr2022.33.2.12","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.2.12","url":null,"abstract":"The Pangasianodon hypophthalmus (striped or tra catfish) is a Pangasiidae family member famous for its high unsaturated fatty acid content flesh. This riverine catfish can breathe in the air unlike the channel catfish. One of the most well-known ecotoxicological protein superfamily, the ATP-binding cassette (ABC) transporters, has been characterised in channel catfish through a genome-wide approach. Therefore, it is interesting to unearth these proteins within the striped catfish genome for a comprehensive comparison across all catfishes available. A total of 52 ABC transporters were discovered from the striped catfish genome. The motif analysis has unconcealed various unshared characteristics of some catfishes. The phylogenetic analysis has evidenced its effectiveness in the successful annotations of these transporter proteins. Duplicated genes such as ABCA1, ABCB3, ABCB6, ABCC5, ABCD3, ABCE1, ABCF2 as well as ABCG2 were uncovered within the striped and channel catfish genomes. This entire set of ABC transporters yields precious genomic data for future ecotoxicological, biochemical and physiological research in striped catfish.","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9354906/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40697871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Reproductive Biology and Feeding Ecology of The Blue Swimming Crab (Portunus pelagicus) in Northern Coastal Waters, Sri Lanka. 斯里兰卡北部沿海蓝蟹(Portunus pelagicus)繁殖生物学和摄食生态学。

IF 1.4

Tropical life sciences research Pub Date : 2022-07-01 Epub Date: 2022-07-15 DOI: 10.21315/tlsr2022.33.2.8

Ssk Haputhantri, Khk Bandaranayake, Mig Rathnasuriya, Kgs Nirbadha, Sjwwmmp Weerasekera, Aash Athukoorala, Ram Jayathilaka, Hacc Perera, S Creech

{"title":"Reproductive Biology and Feeding Ecology of The Blue Swimming Crab (Portunus pelagicus) in Northern Coastal Waters, Sri Lanka.","authors":"Ssk Haputhantri, Khk Bandaranayake, Mig Rathnasuriya, Kgs Nirbadha, Sjwwmmp Weerasekera, Aash Athukoorala, Ram Jayathilaka, Hacc Perera, S Creech","doi":"10.21315/tlsr2022.33.2.8","DOIUrl":"https://doi.org/10.21315/tlsr2022.33.2.8","url":null,"abstract":"Blue swimming crab (Portunus pelagicus) fishery has emerged to become an important export-oriented fishery in Sri Lanka over a decade and recently resulted in a rapid increase in the exploitation. The present study attempts to understand the reproductive biology and feeding ecology of blue swimming crab which will be vital in the management of capture fishery. Five major landing sites in the Jaffna district in Northern Sri Lanka, where blue swimming crab is frequently landed throughout the year were selected for the study. Biological parameters relating to sex, carapace width, body weight, maturity, and egg sac colour with egg sac weight were recorded at the field from November 2014 to October 2015. Randomly selected crab samples were brought to the laboratory and analysed for their maturity stages, length at first maturity, Gonadosomatic Index, fecundity, and gut contents. The study revealed that male crabs mature at a smaller size than females. The sex ratio varied greatly with time and males were always dominant in the catch. The blue swimming crabs in the Northern waters of Sri Lanka spawn throughout the year, with two spawning peaks in February and May. The total fecundity of ovigerous blue swimming crab increased with increased carapace width and body weight and it ranged from 123,482 to 3,179,928 eggs, with an average of 884,982 ± 676,420. A remarkably higher percentage of empty stomachs were observed under the present study in both mature and immature crabs and this could be due to lack of food availability in the environment and different digestibility rates of food items. The diet of blue swimming crab is highly variable reflecting the ability to adopt to different modes of feeding.","PeriodicalId":23477,"journal":{"name":"Tropical life sciences research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9354908/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40697873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1