Sri Lanka Journal of Aquatic Sciences最新文献_第2页

Spatial and temporal variation of physicochemical parameters of coastal waters in the southwestern region of Sri Lanka 斯里兰卡西南部沿海水域理化参数的时空变化

Sri Lanka Journal of Aquatic Sciences Pub Date : 2023-03-15 DOI: 10.4038/sljas.v28i1.7603

J. Jayawardhane, K. Weerasekara, M. Pathmalal

引用次数: 0

Validating the fishing locations reported in the logbooks using the positional data of vessel monitoring systems in the multi-day fishery of Sri Lanka 利用斯里兰卡多日渔业中船舶监测系统的位置数据，验证航海日志中报告的捕鱼地点

Sri Lanka Journal of Aquatic Sciences Pub Date : 2023-03-15 DOI: 10.4038/sljas.v28i1.7604

N.D.P. Gunawardane, M. M. Ariyarathna, Upali Sarath Amarasinghe, M. de Croos

引用次数: 1

Physico-chemical properties of chitosan extracted from Whiteleg shrimp (Litopenaeus vannamei) processing shell waste in Sri Lanka 斯里兰卡凡纳滨对虾(Litopenaeus vannamei)加工壳废料提取壳聚糖的理化性质

Sri Lanka Journal of Aquatic Sciences Pub Date : 2022-10-05 DOI: 10.4038/sljas.v27i2.7600

C. Liyanage, S. Gonapinuwala, C. Fernando, M. de Croos

{"title":"Physico-chemical properties of chitosan extracted from Whiteleg shrimp (Litopenaeus vannamei) processing shell waste in Sri Lanka","authors":"C. Liyanage, S. Gonapinuwala, C. Fernando, M. de Croos","doi":"10.4038/sljas.v27i2.7600","DOIUrl":"https://doi.org/10.4038/sljas.v27i2.7600","url":null,"abstract":"The present study investigated the potential of whiteleg shrimp shell waste to use as a source of chitosan which has a limited focus on previous Sri Lankan studies. Comparatively higher amount of chitosan yield (33.53%) was obtained in the study with 91.78 ± 0.66 (%) of dry matter content, 8.22 ± 0.66 (%) of moisture content, 1.08 ± 0.24 (%) of ash content, 80.43% of the degree of deacetylation, 435.87 ± 1.03 cP dynamic viscosity and a good thermal stability up to 312 °C. Fourier transform infrared spectroscopy (FTIR) analysis confirmed the structure of chitin and chitosan by the presence of their characteristic IR bands and X-ray diffraction analysis further verified the crystalline structure of the extracted chitin and chitosan. Scanning electron microscopic (SEM) images of the extracted chitosan recognized the layers of flakes with porous and fibril structures. According to the energy-dispersive X-ray spectroscopy image, carbon, oxygen and nitrogen were observed as the major elements in the extracted chitosan and no calcium peaks were detected confirming effective demineralization in the extraction process. Further, DPPH (2,2-diphenyl-1-picryl hydrazy) assay revealed that the chitosan solution with the concentration of 10 mg/mL was having 66.45% of free radical scavenging activity. Thus, the present study reveals that the chitosan with high quantity and quality can be extracted from whiteleg shrimp ( Litopenaeus vannamei ) processing shell waste in Sri Lanka suggesting a solution to the waste accumulation in processing factories while proposing an alternative income generation strategy from waste.","PeriodicalId":21784,"journal":{"name":"Sri Lanka Journal of Aquatic Sciences","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90464880","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

A field guide to the fishes in freshwaters of Sri Lanka 斯里兰卡淡水鱼类的野外指南

Sri Lanka Journal of Aquatic Sciences Pub Date : 2022-10-05 DOI: 10.4038/sljas.v27i2.7602

Upali Sarath Amarasinghe

引用次数: 0

Microcystin-LR contamination in Nile tilapia (Oreochromis niloticus) in some water bodies in Sri Lanka 斯里兰卡一些水体中尼罗罗非鱼的微囊藻毒素- lr污染

Sri Lanka Journal of Aquatic Sciences Pub Date : 2022-10-05 DOI: 10.4038/sljas.v27i2.7599

H. Abeysiri, P. Manage

{"title":"Microcystin-LR contamination in Nile tilapia (Oreochromis niloticus) in some water bodies in Sri Lanka","authors":"H. Abeysiri, P. Manage","doi":"10.4038/sljas.v27i2.7599","DOIUrl":"https://doi.org/10.4038/sljas.v27i2.7599","url":null,"abstract":"Microcystin-LR (MC-LR) is a cyanotoxin produced by certain cyanobacteria species. It is toxic to humans and animals. Several studies have demonstrated that cyanotoxins accumulate throughout the food chain, eventually reaching high levels in freshwater fish. The Nile tilapia ( Oreochromis niloticus ) is the most popular freshwater fish in Sri Lanka and in most Asian countries. The current study sought to determine MC-LR concentration in Nile tilapia collected from thirteen freshwater reservoirs; Nallachchiya, Galkulama, Anakattiya, Padaviya, Nachchaduwa and Kalawewa in Anuradhapura District, Parakrama Samudraya, Halmilla, Kaudulla and Ambagaswewa in Polonnaruwa District, Muwapatigewela in Ampara District, and Ulhitiya and Rathkinda in Badulla District. The fish and water samples were collected, transported, and analyzed following standard procedures, and MC-LR was determined using a BEACON ELISA kit. To determine the MC-LR and Tolerable Daily Intake (TDI) levels in fish, samples of the fish skin, flesh, and head were collected and analyzed according to World Health Organization (WHO) guidelines. A comparison was made between the MC-LR levels of fish in different reservoirs and the WHO TDI standards (0.04 µgkg -1 day -1 ). From the Padaviya, the highest mean concentrations of MC-LR were found in fish skin (3004.25 ± 30 µg kg -1 ), following head (836.25±18 µg kg -1 ) and flesh (41.67±8 µg kg -1 ). The average daily intake of MC-LR in the skin and head of all samples exceeded the WHO's TDI (0.04 µg kg -1 day -1 ). According to the findings of this study, consumption of fish heads and skin increases the risk of MC-LR accumulation in the human body by a significant amount.","PeriodicalId":21784,"journal":{"name":"Sri Lanka Journal of Aquatic Sciences","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84100996","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

Water quality, microcystin-LR, and Cylindrospermopsin contamination status of spring and dug well water in CKDu high, low, and non-prevalent areas of Sri Lanka 斯里兰卡CKDu高、低和非流行地区的泉水和挖井水的水质、微囊藻毒素- lr和柱精子素污染状况

Sri Lanka Journal of Aquatic Sciences Pub Date : 2022-10-05 DOI: 10.4038/sljas.v27i2.7598

H. Abeysiri, P. Manage

引用次数: 0

Spatial distribution and dynamics of selected mangrove forests on the east and west coasts of Sri Lanka 斯里兰卡东西海岸精选红树林的空间分布和动态

Sri Lanka Journal of Aquatic Sciences Pub Date : 2022-10-05 DOI: 10.4038/sljas.v27i2.7601

W. Silva, K. Perera, M. Amarasinghe

引用次数: 0

Knowledge and prospects of Sri Lankan aquatic science research: A bibliometric analyses 斯里兰卡水产科学研究的知识与展望:文献计量分析

Sri Lanka Journal of Aquatic Sciences Pub Date : 2022-03-21 DOI: 10.4038/sljas.v27i1.7592

Tharindu Bandara

引用次数: 1

Dried fish production and trade in Negombo, Sri Lanka 斯里兰卡尼甘布的干鱼生产和贸易

Sri Lanka Journal of Aquatic Sciences Pub Date : 2022-03-21 DOI: 10.4038/sljas.v27i1.7595

T. P. U. Neranjala, W. G. D. Eranga, D. Dissanayake

引用次数: 1

Effect of autoclaving as a pre-treatment in the wet reduction process for extracting fish oil from yellowfin tuna heads 高压灭菌预处理对黄鳍金枪鱼鱼油湿还原工艺的影响

Sri Lanka Journal of Aquatic Sciences Pub Date : 2022-03-21 DOI: 10.4038/sljas.v27i1.7596

K. P. C. Lakmini, S. Gonapinuwala, H. P. S. Senarath, C. Fernando, I. Wijesekara, M. de Croos

引用次数: 5