Research Symposium-2012

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Browsing Research Symposium-2012 by Subject "Aquaculture & Fisheries"

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    Development of Fish Glue using Skin of Yellow fin tuna (Thunnus albacares) and Mahi-mahi (Coryphaenidae hippurus) and Characterization of glue Properties
    (Uva Wellassa University of Sri Lanka, 2012) Manjula, U.D.P.; Jayamanne, S.C.; Nadeeka, T; Malawige, M
    Fish glue is made out of fish skin and is a special type of glue which differs from other animal glue due to their specific glue properties. It remains as a liquid in room temperature and has a higher open time, and very sticky (Shepherd, 2009). Fish glue is usually made from head bones, skin and fins of the cold water marine fish. Characteristics of the final glue product depend on the raw material selected (Norland„ 1990). Recognition of the limited biological resources and increasing environmental pollution has emphasized the value-addition using under-utilized fish and the by-products from the fish industry (Geurard ei at. 2002). Dorsal skin of Yellow fin tuna (Thtuuiius albacares) is removed during tuna processing and can be used as a source of fish collagen. The main objective of this study was to find out the best quality fish glue using fish skin of the yellow fin cuna and Mahi-mahi (Cor)›phaenidae hippurus), and to identify the best and cheapest processing method For extraction of fish glue from yellow fin tuna and Mahi-mahi fish skin.
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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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    Impact of Marketing Strategies on Export Performance of Ornamental Fish Industry in Sri Lanka
    (Uva Wellassa University of Sri Lanka, 2012) Ajanthini, S.; Sutha, R.J.
    Ornamental fish industry is categorized as the gainful income source to our country. It generates jobs, incomes and foreign exchange. Presently, income earned per year from the export of ornamental fish amounts to Rs.920 million. However, major challenges that faced by this industry are packing technology and direct flights facilities from Sri Lanka to the final market destination etc. Sri Lankan ornamental fish industry is ranked tenth in the world as an ornamental fish supplier and accounts for 2.7 in the global ornamental fish mnket. According to the current context, ornamental fish export industry is undergoing an inefficient market condition. Therefore, this research focused to identify the existing practices of marketing strategies in Sri Lankan Ornamental fish exports, to determine the strength of relationship between marketing strategies and export performance and contribution of selected marketing strategies on export performance of the Sri Lankan Ornamental fish exporters.
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    Optimization of Available Agar Processing Methodologies of Gracilaria verucosa in Kinniya
    (Uva Wellassa University of Sri Lanka, 2012) Yalinee, M; Jayamanne, S.C.; Pahalawattaarachchi, V.
    Seaweeds in Sri Lanka are mainly utilized for the production of commercially important products like agar-agar and alginic acid. Agar is commercially produced from Gracilaria and Celidiiim species (durairatnam.1962) But the gel strength is very low. This is mainly due to the processing technologies adopted and it is necessary to optimize the processing technologies to produce Agar with higher gel strength. In the present study, attempts were made to produce Agar with higher gel strength and higher yield using the species, Gracikiria verucosa.