Browsing by Author "Sosai, B.M.K."

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    Comparative Study on Ring Net and Bottom-Set Gillnet Fisheries in Thalaimannar Pier, Sri Lanka
    (Uva Wellassa University of Sri Lanka, 2020) Kulas, J.A.J.F.; Wickramaratne, I.U.; Sosai, B.M.K.; Gayathry, L.D.
    Thalaimannar Pier, Sri Lanka was dominant with Ring net (Surukku) and Bottom-set gillnet fisheries. Details with those fisheries were lacking in the literature. A comparative study of both fisheries in Thalaimannar Pier was vital towards sustainable exploitation of fishery resources. The study aims at determining Catch-Per-Unit-Effort (CPUE), catch composition, and supply chain analysis of selected species from two fisheries last October (2019) to early January (2020). Total catch was recorded to the nearest kilogram and effort in-unit kilograms per square meter (kgm-2 ). The total catch of fish species in ring & gill nets was recorded. Results showed ring net catch mainly comprised of finfish (97.8%), crustaceans (1%), mollusk (1%); 1.2% were non-target species. Bottom-set gillnet catch comprises of crustaceans (50%), finfish (25%), mollusk (20%), and echinoderms (1%). Portunus pelagicus was the major target species, nearly 43% of the total catch. Out of the total, 29% of the bottom-set gillnet catch was discarded as nontarget species. Gillnet produced more non-target species. Mean CPUE (kgm-2 ) and standard deviation of ring & gill nets were 0.205 ± 0.062 and 0.0711 kgm-2 ± 0.018 respectively. CPUE for ring net increased from Late-November to Early-January; for gillnet, it decreased from mid November to early January. Sardinella gibbosa showed 71.11% of the price difference from wholesalers to outside retailers and Pampus argenteus (only exportable species) showed 47% of it from fishers to exporters in the supply chain. Ring net was harmful due to comparatively high catch per unit effort which may lead to overexploitation of commercially important fish populations. Gillnet was also harmful due to the high catch of non-target species. The current study provides baseline information that paves the way for sustainable exploitation of the aforementioned fisheries. Keywords: Ring net & Bottom-set gillnet fisheries, Catch per unit effort, By-catch
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    An Investigation of the Economic Impact on Fishing Communities in Mannar District Caused by Illegal Fishing by Indian Trawlers in Sri Lankan Waters
    (Uva Wellassa University of Sri Lanka, 2016) Sosai, B.M.K.; Wickramaratne, I.U.; Jayamanne, S.C.
    Mannar district is located in the Northwestern Sri Lanka (8° 52' 0" N, 80° 4' 0" E). Thalaimannar, Pesalai, Vankalaipaadu, Erukkalampiddy, Pallimunai, Panankaddikoddil, Thalvupadu in Mananr District were selected for the study. Primary data were collected through a questionnaire survey and direct interviews with fishing community leaders, officials of department of fisheries, fishing agents and traders. Information on fishing season (charts), monthly income, the relative impact of Indian trawlers on village fishing activity, direct and indirect losses to the ancillary service sectors in each village, the quantities of fish and fish species caught by Indian trawlers and the number of Indian trawlers and their annual production were obtained. Secondary data was gathered through research papers, publications and internet. Gathered data were analysed with three approaches i.e. Approach A: Direct losses due to Indian trawlers harvesting Mannar's marine resources, (estimated daily and annual direct losses were Rs.54.4 million and Rs.6955.2 million, respectively) Approach B: Indirect loss due to Mannar fishermen by not being able to harvest Mannar's marine resources (estimated annual indirect losses were Rs.425.63 million), Approach C: Direct losses due to the destruction of fishing gears (Rs. 2, 56, 18,750), Approach D: Direct and indirect losses for ancillary service sector (Rs.24, 59,400 and Rs.24, 59,400 respectively). Data were analyzed using MS Excel 2010. Indian trawlers fish in the northern Palk Bay and south of Gulf of Mannarall year round, while they trawl Pesalai, Vankalaipadu, Erukkalampiddy and Pallimunai in northern coast of Mannar from May to October. Further, Panankaddu koddil and Thalvupadu, located in Southern Mannar were trawled from November to April. Mechanized trawling has been banned by Tamil Nadu State Government for 45 days a year, therefore illegal trawl fishing stops in between March to April (about 45 days). In this study it was found that Thalaimannar (with idela location for fishing), Peasalai and Vankalaipaadu villages were highly affected. Vankaalaipaadu fishery activities mainly depend on gill net. It was found gill net fishing activity was affected by trawler activity. Five other villages faced less loss due to the operation of trawlers, because fishery activities carried out only for six months using variety of fishing gears. Keywords: Mannar district, Indian Trawlers, Coastal fishery, Gill net, Economic Impacts.