Research Symposium-2012

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Browsing Research Symposium-2012 by Subject "Capture Fisheries"

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    Development of Fish Soup Cube using Yellow Fin Tuna Off-Cuts
    (Uva Wellassa University of Sri Lanka, 2012) Thalpawila, T. K.R.N; Nadeeka, T; Jayamanne, S.C; Thushari, S. W.N.
    Fish are principal source of protein for world population end play s vital role in meeting basic nutritional and Livelihood needs. Fish products are comparable to meat and dairy products in nutritional quality. Today even more people turn to fish as healthy alternative to red meat. Sri Lanka has a large potential for marine fish production as it is surrounded by an Exclusive Economic oceanic area. A recent study has showed that average recovery percentage of expensive cuts of yellow fin tuna (Thiinnus albacares) from a medium scale processing factory is approximately 50%. The remaining inexpensive off cuts has low market value. Tuna trimmings can be purchased at Rs.200.00 per kg. The profit margin of Food processing companies can be increased while convening these off cuts into value added products. Fish soup cubes are now an established item on the world food market but non available in local market. A soup is a flavorful and nutritious liquid Food served ac the beginning of a meal or a snack. Instance soup cubes can save a good deal of Tillie and effort. This study was conducted to develop fish soup cube using tuna off-cuts. The present study was carried out with an aim of producing a soup cube by adding value to low valued off cuts of yellow fin tuna.
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    Development of Liquid Fertilizer from Brown Seaweed-Surgassum sp
    (Uva Wellassa University of Sri Lanka, 2012) Thilakarathne, W.M.N.; Pahalawattaarachchi, V.; Jayamanne, S.C.
    Seaweeds are macroscopic marine algae which mostly visible with naked eye, photosynthetic and eukaryotic organisms. Sri Lanka has many varieties of marine algae and about 340 seaweed species (Durairatnam, 1961) that has a high potential to add value. Unfortunately exploitation and utilization of seaweeds is at a minimum level in Sri Lanka. The developments of Seaweed Liquid Fertilizer (SLF) from brown seaweed (Sargassum sp.) contribute scientifically and technologically to add value to seaweeds in Sri Lanka. SLF contain macro nutrients, trace elements, organic substances, and plant growth regulators such as auxin, cytokinkin and gibberellins (Thirumaran et at., 2009) and are important for plants to increase the yield of crop plants, increase nutrient uptake from the soil, enhance water retention capacity of soil and act as a soil conditioner. The present study is the first attempt in Sri Lanka to develop a Liquid fertilizer using seaweeds.
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    Effect of Feeding Method and Locally Produced Blood Meal Incorporated Diet on Growth of Young Male Guppy Fish (Poecilia reticuliitii)
    (Uva Wellassa University of Sri Lanka, 2012) Senaarachchi, W. A. R. K; Jayamanne, S.C; Liyanage, N.P.P; Bambaranda, B. A.S. M; Chandrarathna, W. P. R
    The tropical ornamental fish production is among the most valuable industries in the world arid the live bearer guppy fish (Poe cilia reticulate) are the most popular species among hobbyists (Harpaz e/ al., 2005). An information oil dietary requirement of guppy fish has been mainly evaluated by the individual experience of the farmers and is readily available. Guppy fish is known as omnivorous and require 40-45% dietary protein level in their diet (Harpaz er at., 2005). Fish feed is the single highest costly input in the ornamental fish industry and traditional I y fish meal is regarded as the commonest and most popular source of protein in the commercial feed production (Otubusin ci at., 2009). Jonston (2005) cited in Oubusin e/ at. (2009) has reported that global supply of fish mean would not be sufficient to satisfy the demand in 2014. Hence, the present study aimed to evaluate the use of blood meal as an a alternative protein source for the fish meal in the young male guppy fish diet and the form of feeding that could be ad ministered.
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    Effects of pH on Egg Hatchability, Survival Rate and Growth Rate of Yolk Sac Larvae of Goldfish (Caressius auratus)
    (Uva Wellassa University of Sri Lanka, 2012) Gunasinghe, K.Y; Liyanage, N.P.P; de Silva, D.P.N; Epasinghe, M
    Ornamental fish trade is a global industry of significant economic importance. For a developing country like Sri Lanka if managed sustainably, fresh water ornamental fish trade can generate employment opportunities as well as foreign exchange (BOBP, 2000). Goldfish [Carassius auralus) is a well known freshwater ornamental fish, which is among the most popular freshwater fishes throughout the won Id. Water quality parameters have profound e££ect on fish’s biological and physiological factors. For successful fish culture proper management of water quality parameters are required as they are crucial for larval survival and growth (Zaniboni-Filho, cl at., 2008: , Smam and Bundell, 1996: Lloyd and JorJan, 1964 cited in Gao, e/ o/., 20 I I). pH, potential hydrogen ion concentration is sucl1 an important water quality parameter in aquaculture. Fresh water ornamental fish culturists in Sri Lanka uses water from different water sources * such as tap water, underground water and surface water sources like rivers, streams, reservoirs, tanks. Due to different climatologic and geographic factors, pH value of above fresh water sources may differ froi i each other (SiIva and Manuweera, 2004). Most of the fresh water sources in Sri Lanka are having pH range of 5.4 -9.0 (Silva, 2004: Kotagama, e/ o/., \ 989). The ma in objective of this study is to find out the effects of water pH on egg hatch ability, survival rate and growth rate of yolk sae larvae of goldfish and to identify the most suitable water pH range for gold fish culture.
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    Study on Level of Histamine in Yellow fin Tuna (Thunnus Albacares) in Relation to Body Size, Seasonal Variations and Spatial Variations
    (Uva Wellassa University of Sri Lanka, 2012) Piyadasa, T.C.H.; Jayamanne, S.C.; Wethttiasinghe, M.P.
    Sri Lanka has a 1 500 km costal line and 23000 k 2 exclusive economic zones and the country has been engaged in fishery activity for a long time. Tuna is one of most imported fishery product in Sri Lanka and the annual production is around 80,000 metric tons (Fisheries year book, 2008). The European Union is the highest importer of tuna from Sri Lanka followed by Japan and United Kingdom of America respectively. Yellow fin tuna (Tliunnus albacares) is the species mainly exposed as fresh fish products from Sri Lanks. Private sector plays a dominant role in the processing, mattering and distribution of fish lot local consumption and exports. Histamine is a naturally occurring substance in mammalian physiology and when it is released in large amounts causes allergic and other reactions (Cavanah and Casale, 1993). Histamine exerts its effects by binding to receptors on cellular membranes in the Respiratory, cardiovascular, gastrointestinal and hematological/ immunological systems and the skin. Hence, the tuna with higher histamine levels are rejected in the export market. When consider landing sites, good hygienic practices on board fishing vessels, especially during landing and processing, is important to inanimate contamination with non- indigenous histamine producing bacterial species. Good hygiene at processing and preparation stages further along the supply chain is also imponant for the histamine development. So far, research has not been conducted in Sri Lanka regarding this issue and the present study aims to identify the factors inducing elevation of histamine levels in Tuna fish and improving the conditions to reduce histamine levels in Tuna.