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  Subjects -> WATER RESOURCES (Total: 160 journals)
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Sri Lanka Journal of Aquatic Sciences
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1391-2038
Published by Sri Lanka Journals Online Homepage  [71 journals]
  • The preservative roles of barley extract on physico-chemical treats of
           common carp (Cyprinus carpio L.) fillets under refrigerated condition

    • Abstract: The study was carried out to determine the effect of barley extract on the shelf life of common carp fillets that refrigerated at 4°C through thiobarbituric acid (TBA), pH, water holding capacity, moisture contents and cooking loss. Using of thiobarbituric acid proved suitable for studying lipid hydrolysis and primary and secondary lipid oxidation in samples of common carp throughout refrigerated storage. Barley powder extract solutions (water extraction) were prepared at the concentration of 0.5%, 1% and 1.5 % (v/v), also, control without adding barley extract. The samples were then stored under refrigerated conditions (4.0°C) for 0, 3 and 6 days until analysis. The results confirmed the efficacy of natural antioxidants derived from barley slowing down lipid hydrolysis and increasing the oxidative stability of common carp flesh. Published on 2022-11-21 00:00:00
  • Knowledge and prospects of Sri Lankan aquatic science research: A
           bibliometric analyses

    • Abstract: The present study summarizes the research productivity and international collaboration in aquatic studies conducted by Sri Lankan scholars during 2000-2019. The study was based on the SCOPUS® database. R programming language, package bibliometrix and Vosviewer software were employed in the analysis. Results of the present study indicate that increasing growth trend in the annual number of publications. A significant correlation (p<0.05) between the number of articles and per capita GDP (Gross Domestic Production) was also observed. Senior authors dominated in terms of the article count, citation count, h index, and other author productivity indices. Journal of the National Science Foundation of Sri Lanka had the highest article count (n=33). Aquatic studies in Sri Lanka were more locally funded. Sri Lanka had strong research collaborations with Japan, South Korea and Australia. During 2000-2019, the transition of aquatic studies from lacustrine field studies to molecular lab-based studies were observed. The findings of the present study may provide a comprehensive understanding on the current context and future directions of aquatic studies in Sri Lanka. Published on 2022-03-21 00:00:00
  • Present status of smoked fish processing at Mahakanadarawa reservoir in
           Mihintale, Sri Lanka.

    • Abstract: Fish smoking has become a popular processing method in Mahakanadarawa reservoir, with the potential for substantial demand among frequent visitors to Anuradhapura. This industry generates considerable income for the local livelihoods and reduces the post-harvesting losses. Government and Non-government Organizations have recognized the necessity of expanding the smoked fish industry in this area. However, there is a scarcity of scientific information on this vital industry. This study focuses on the current state of smoked fish production in the Mahakanadarawa reservoir. A field survey was conducted to determine the types of fish and fuel wood used, the type of technology they apply, and the challenges they encounter in both storage and in the supply chain to the consumer. The majority of smoked fish processors were found to be directly connected with fishing in the Mahakanadarawa reservoir and when there is a surplus catch, fishers produce smoked fish. Although tilapia is the most abundant smoked fish in the study area, snakehead is the most popular fish with a higher commercial value. Hence, breeding strategies should be used for such commercially important species. Smoking technologies in the study area are still at an extremely rudimentary level, leading to substantial processing losses due to uneven exposure to heat and smoke. Different types of fuelwoods are used by the processors to enhance the characteristic colour and smoky aroma that enticed their buyers. These types of woods may have essential anti-oxidant and bactericidal properties in addition to their distinctive flavour, colour, and aroma, and as such, further studies are recommended. Most of the smoked fish producers do not have adequate technologies for packaging and storage their products. Majority uses paper-based cartons and discarded Styrofoam boxes. Such paper-based materials generally absorb the valuable fish oil while poorly sealed Styrofoam containers are attributed to rancidity and growth of molds. Thus, empowering them with sufficient technologies and resources may reduce postharvest losses and lead to ensuring the catering of growing consumer demand throughout the year. Published on 2022-03-21 00:00:00
  • Dried fish production and trade in Negombo, Sri Lanka

    • Abstract: A well-established year-around dried fish production process is practiced at Negombo, the west coast of Sri Lanka, and this study evaluates the present status of this industry using the data collected from February to December 2017. There are forty-two dried fish processing centres at Negombo sea street area, providing livelihood opportunities for ~320 employees. Eighteen fish species belonging to 9 families are used in dried fish production and species belonging to the family Carangidae made the highest percentage contribution (21.6%), followed by the Clupeidae (21.4%), and Scombridae (21.4%). The results of the Quality Index (QI)Method revealed that both high-quality and very low-quality fish are used in dried fish production, and the overall QI of Katsuwonus pelamis, Euthynnus affinis, Decapterus macarellus, and Elagatis bipinnulata ranged from 15–16. Effects of drying on proximate composition were assessed, and significantly higher crude protein, content was recorded in dried fish than in fresh fish (p<0.05, t-test). Drying has also resulted in a significant increase in crude fat content in all these species except for Canthidermis maculatus (p<0.05; t test). De-heading and gutting, washing, salting, rewashing, drying, and packing were the major steps in the dried fish production process. Although the total coliform was reported in water samples used in the dried fish processing centres, it was not encountered in any of the dried fish samples. The dried fish value chain mainly consisted of fishermen, buyers, processors, sellers, and consumers, and upgrading of products, processes, and functions along the value chain was suggested to produce better quality dried fish and increase the profit margins of value chain actors. Published on 2022-03-21 00:00:00
  • Effect of autoclaving as a pre-treatment in the wet reduction process for
           extracting fish oil from yellowfin tuna heads

    • Abstract: Various studies have focused on extracting fish oil using a variety of methods, yet, the wet reduction process is the common industrial method as it is environmentally friendly. However, the use of autoclaving in extracting oils from fish or fish by-products are comparatively less. Therefore, this study was conducted to extract crude oils from the yellowfin tuna (Thunnus albacares) head, the lipids richest body part compared to processing offcuts like skin, viscera etc., by a simple wet reduction process using an autoclave at 121°C as the pre-treatment with different holding times (15, 30, and 45 min). The maximum extraction yield of 5.37±0.22 % was recorded at 30 min holding time of autoclave. No significant changes in peroxide value, moisture content and colour values were observed for the different autoclaving durations (P > 0.05). Conversely, acid value, p-anisidine value and total oxidation value (TOTOX) were increased significantly with a longer autoclaving duration of 45 min (P < 0.05). However, all peroxide values, p-anisidine value, TOTOX value were below the standard values stated by the World Health Organization (WHO) except the acid values which shows the need for refinery before any applications. Based on the spectra of Attenuated total reflectance - Fourier transform infrared (ATR-FTIR), autoclaving for a longer time resulted in lower intensity at wavenumbers around 3,012 - 3,013 and 1,741 - 1,744 cm−1 and shifting of bands to lower wavenumbers showing its effect on the structural changes of molecules in the oil. All extracted oils resulted in a high PUFA content than MUFA and SFA contents based on the fatty acid composition. The DHA (C22:6, n3) was the most prominent fatty acid in all the oil samples. However, PUFA content was reduced slightly by increasing the autoclaving duration at 45 min. Therefore, this study concludes autoclaving at 121°C for 30 minutes as the optimum pre-treatment conditions to extract fish oil from yellowfin tuna heads using the wet reduction process. Published on 2022-03-21 00:00:00
  • Length weight relationships of fish species collected after impoundment of
           the Three Gorges Reservoir (TGR) in China; a study carried out in the
           upper Yangtze River

    • Abstract: The Three Gorges Dam in the upper Yangtze River in China is the largest hydropower project in the world. Length- weight relationships (LWRs) are reported for fish species collected from three locations of the reservoir from November 2010 to October 2011. Fish were collected from the local fishing boats using 1.5 cm nylon mesh trap nets or 4, 5 and 6 cm nylon mesh gillnets (100- 120 m long × 1.4-1.5 m high). A total of 7,311 fish representing 49 species of 11 families were collected during the study period. There were 2,680 fish belonging to 32 species of 8 families sampled in Zigui (near the dam) reach, 2,845 fish representing 46 species of 8 families in Wanzhou (middle of the reservoir) reach and 1,786 fishes representing 38 species of 8 families in Fuling (upper reservoir) reach. The family with the highest number of species was Xenocyprididae. The intercept (a) and slope (b) of LWRs are useful in fisheries science in many ways. Therefore, the present study provides baseline data on LWRs of the economically valuable and most abundant fish species in the recently commissioned Three Gorges Reservoir. Published on 2022-03-21 00:00:00
  • Assessing genotoxic potential of petroleum refinery wastewater using
           biomarkers of laboratory exposed and field captured fishes

    • Abstract: Petroleum refinery wastes contain mixtures of toxic compounds including Polycyclic Aromatic Hydrocarbons (PAH) which may pose genotoxic threats to the biota.  The objective of the present study was to assess the genotoxic potential of wastewaters of the petroleum refinery at Sapugaskanda, Sri Lanka using erythrocytic micronuclei and nuclear abnormalities as genotoxic biomarkers in the fish Oreochromis niloticus exposed to the refinery wastewater under controlled laboratory conditions and in the field captured fishes from the canals close to the refinery. Erythrocytic micronuclei and nuclear abnormalities in the peripheral blood were evaluated using cytogenetic tests. Patterns of fluorescent aromatic compounds in the fish bile were also examined using fixed fluorescence spectrometry to assess potential PAH exposure. Erythrocytic micronuclei, nuclear buds and notched nuclei in the peripheral blood were highly induced (P < 0.05) in O. niloticus exposed to the wastewater for 7 days under laboratory conditions in comparison to the control fish. The field-captured fishes, Trichogaster pectoralis and Dawkinsia singhala inhabiting water canals near the petroleum refinery also demonstrated significant induction (P <0.05) of erythrocytic micronuclei and other nuclear abnormalities. PAH exposure indicative bile fluorescence patterns (naphthalene, phenanthrene, pyrene, and benzo(a)pyrene types) were detected in the fish exposed to the wastewater under laboratory conditions and in the field captured fishes. The results revealed that the wastewater of petroleum refinery contains genotoxic chemicals including PAHs. Hence, incorporation of genotoxicity tests as bioanalytical tools for regulating the discharge of final refinery wastewater to the aquatic ecosystems would be prudent in consideration of sustainable development goals focusing on the ecosystem and human safety. Published on 2021-09-15 00:00:00
  • Constraints in culture-based fisheries of Sri Lanka and strategies for
           future development

    • Abstract: In the fisheries sector, fisheries enhancement through culture-based fisheries (CBF) has been recognized as an environmentally friendly approach, which is bound to contribute to increasing food fish production, especially in developing countries. Through concerted efforts, Sri Lanka achieved considerable success in CBF development in small village reservoirs in the country. However, there are some constraints to achieve the full potential in the development of CBF in Sri Lankan inland waters, which require certain interventions. Despite the availability of a magnitude of small village reservoirs in the country, the full potential of utilization of these water bodies is not achieved mainly due to the inadequacy of stocking material at the correct time under the present strategy of fish fingerling production for stocking reservoirs. It is therefore imperative that effective intervention be in place for the establishment of backyard hatcheries using simple technologies to the self-help community groups in the rural areas. The CBF strategies in non-perennial reservoirs of the country are essentially dependent on the water availability in reservoirs following monsoonal rainfall patterns. Due to anomalies in monsoonal rainfall patterns under climate change scenarios, water availability in non-perennial reservoirs in the dry zone of Sri Lanka for CBF development is rather unpredictable. As such, there is a potential risk that the rural groups engaged in fry-to-fingerling production face the difficulty of selling fish fingerlings to CBF farming groups when the non-perennial reservoirs are not filled due to insufficient monsoonal rains. An alternative strategy to link fingerling-producing community groups with the agricultural farming communities in minor perennial reservoirs should be in place to prevent such potential financial losses of fingerling producers. Published on 2021-09-15 00:00:00
  • Diversity and distribution of freshwater molluscan fauna in reservoirs and
           headwater streams of the Kala Oya river basin in Sri Lanka

    • Abstract: In this study, the variation of aquatic molluscan diversity concerning seasonal water level fluctuations (WLF) and sediment texture was investigated in some perennial irrigation reservoirs and the associated head headwater streams in the Kala Oya river basin in Sri Lanka. Altogether 11,752 molluscan specimens belonging to 10 gastropod taxa (96.6%) and 2 bivalve taxa (3.4%) were identified. Of these, 11,282 specimens (96.0%) were from reservoir sampling sites and the remainder 470 (4.0%) was from the associated headwater streams. Of the gastropods, the individuals of the genus Melanoides showed the highest distribution index (DI) of 0.75 followed by Bellamya (DI = 0.63) and Thiara (DI = 0.60). The DI of the gastropod molluscs showed a significant positive relationship with their shell size (p < 0.05). Although molluscan diversity and taxa richness were comparatively lower in headwater streams than in reservoir sampling sites, Viviparidae (Bellamya; 0.06±0.03), Bithyniidae (Bithynia; 0.21±0.07) and Thiaridae (Thiara; 4.8±1.9 and Melanoides; 1.1±0.8) showed higher relative abundance (expressed as individuals per dm3) in the headwater streams. The reservoir water level fluctuation showed a significant negative relationship with molluscan taxa richness (p < 0.05), but not with the Shannon-Weaver diversity index (p = 0.073). The distribution of molluscs was also found to be related to the sediment texture where the most abundant gastropod genera Bellamia, Bithynia, and Thiara were widely distributed in sandy substrates in reservoirs and associated streams in the Kala Oya river basin. Published on 2021-09-15 00:00:00
  • Muscle pigmentation of Nile tilapia (Oreochromis niloticus) fed on crude
           palm oil incorporated fish feed

    • Abstract: The effects of diets containing crude palm oil on muscle pigmentation and deposition of carotenoids in tilapia (Oreochromis niloticus) was studied. A total of 135 advanced fingerlings with an average body weight and standard length of 9.11±4.78 g and 8.1±0.8 cm, respectively were stocked in tanks for 8 weeks and fed with formulated diets containing crude palm oil (CPO) as the oil component. Weight, standard length, and carotenoid levels in fish were measured biweekly. Muscles of fish fed with the control diet and CPO incorporated diets had carotenoid levels of 0.14±0.03 µg/g and 0.28±0.01 µg/g, respectively. Skin of the fish had carotenoid levels of 3.24±0.02 µg/g in the control and 6.06±0.03 µg/g in the treatment. According to the results 3% CPO incorporated diet had a significant effect on enhancing flesh colour in tilapia. The sensory evaluation indicated that the flesh of CPO fed tilapia fillets were more attractive than the fillets of fish fed control diet. CPO oil is recommended as a natural food colourant for improving flesh quality of Nile tilapia fillets. Published on 2021-09-15 00:00:00
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