Research Symposium-2011

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Browsing Research Symposium-2011 by Subject "Aquaculture and Fisheries"

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    Cost Reduction of Brine Shrimp by Replacing of Low Cost Live Culture (Moina, microworms) for Fresh Water Fish Guppy (Poecilia reticulate)
    (Uva Wellassa University of Srilanka, 2011) De Silva, G.W.H.P.N.; Jayamanne, S.C.; Hewavitharana, M.
    Note: See the PDF Version Ornamental fish farming is an expanding industry and its global export trade has grown steadily and today it is a multimillion dollar industry in many countries (Andrews, 1990). Sri Lanka contributes approximately 1% of the world's demand for ornamental fish. The demand for the fresh water fish is quite does not meet the demand because there are so many constraints related with the fresh water ornamental fish farming. The major constraint is the cost of feed especially during the stage of the post larva and fry. Anemia (brine shrimp) nauplii is the most common live food used in commercial larviculture of fresh water ornamental fish (Dahlgren and Phang. 1985; Kim et al.,1996) and the cost of 400 g of cysts is nearly Rs.4000.00. The present study aimed to find a suitable low cost live food which can replace high cost Anemia in aquariums giving more profits to the ornamental fish traders. Two live food species, Moina and Micro worms, which can be reared easily with very low cost are selected for the study and their suitability in rearing post larval stage and fiy stage of guppy (Poecilia reticulata) was tested under aquarium conditions.
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    Development of a Detector to Determine Presence of Formalin in Fish
    (Uva Wellassa University of Sri Lanka, 2011) Lindamulla, I.; Wijesekara, K.B.; Wasala, M.P.
    Note: See the PDF Version Formalin is an aqueous solution of the chemical compound formaldehyde. Formalin is used as a disinfectant solution. Formalin is commonly used in aquariums to present the growth of parasites. In some cases formaldehyde is produced naturally by certain types of fish. Overuse of formalin causes many health risks for human. Many of these health issues may occur due to illegal use of the formalin. Recently some cases of illegal use of formalin were reported in many coastal areas in Sri Lanka. However, there is no rapid and economical method for formalin detection. Most of the detection methods require expensive and highTechnology apparatus, a large amount of samples, long sample preparation and detection time. Therefore, it is necessary to develop a simple, rapid and a convenient method avoiding the above mentioned disadvantages. The instrument designed is a convenient, rapid and a simplified method of detecting formalin iii fish and can be handled easily. It works at a high accuracy in a range between 100 ppm to 1000 ppm. The design is portable. Samples can be tested within a short period of time. The design is also cost effective and simple.
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    Establishment of Community Based Fish Factory Through Green Supply Chain Management Approaches
    (Uva Wellassa University of Srilanka, 2011) Wijenayake, A.D.; Gamage, Deepa; Jayamanne, S.C.
    Note: See the PDF Version Post-harvest loss is one of the main problems in Sri Lankan fish industry. According to Ministry of Fisheries and Aquatic Resources there is a 30% of post-harvest loss in Sri Lankan marine fish industry. This may be due to lack of facilities and lack of knowledge of the fishermen. Under the greening concept the main idea is to increase the resource utilization by maximizing the output and reduce the environment impact. Therefore, by applying the greening concept the post-harvest losses can be reduced and the environment effect could be minimized and maximum gain could be obtained from the existing resources. Establishment of a community based fish processing factory through green supply chain management approaches is tested here as an option to minimize the post-harvest losses in Sri Lankan fish industry.
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    Preliminary Study on Effect of Different Feed Combinations on Captive Breeding of Anemonefish Amphiprion Clarkii
    (Uva Wellassa University of Srilanka, 2011) Pathirana, P.R.A.; Jayamanne, S.C.; Liyanage, N.P.P.; Kumarasinghe, J.P.R.P.
    Note: See the PDF Version The marine ornamental fish trade began in the 1930s in Sri Lanka (Buckner, 2004). Harvesting marine species for home aquaria has started in I 980s (Andrews, 1990) and the exports have continued to increase in 1990s (Vallejo, 1990). The trade has expanded to a multi-million dollar business and 45 countries supply global markets an estimated 14-30 million fish annually. The largest suppliers are Indonesia and the Philippines, followed by Brazil, Maldives, Vietnam, Sri Lanka and Hawaii. Approximately 150 species of marine fishes are exported from Sri Lanka and all these come from the wild catches. Even though Sri Lanka has a vast potential for marine ornamental fish trade, it has not developed technology on breeding marine ornamental fish in captivity. Anemone fish, Amphiprion clarkii is a species which has a high demand among marine aquarists due to its attractive colors and behavioral display. The fish is caught from the wild destroying the natural habitats due to improper catching methods and may decrease the population. The genus Aniphiprion represent the most important group of captive bred marine species (Olivia et.al, 2006) and the present study aimed to find the possibility of stimulating breeding in Amphiprion clarkii in captivity using two different feeds to reduce the pressure on the natural environment.
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    Production of Tuna Fish Oil by Utilizing Tuna (Thunnus Albacares) Processing by - Products
    (Uva Wellassa University of Srilanka, 2011) Kumara, M.S.S.; Rajapakshe, G.; Jayamanne, S.C.
    Note: See the PDF Version Sri Lanka is surrounded by a coastline of approximately 1700 Km, and belongs to an Exclusive Economic Zone (EEZ) of 517,000 Sq Km. About 50,000 people in the country are directly involved in the fishery industry. The total marine fish production in 2010 was recorded about 332,260 Metric tons (Mt), while Tuna contributed 88903 Mt to the total (Fisheries year Book, 2010). From the total yield about one-third of the catch of fish is not used for direct human consumption but for the production of fishery by products (Balios, 2003). Every year thousands of tons of fish by-products of high nutrient content are discarded by fish processing plants through the world although they can be utilized for other purposes. Crude tuna oil is produced from tuna waste by steam followed by purification, wet rendering, alkali digestion, acid silage Soxhlet like methods (Bimbo, 1990).Tuna fish oil has been considered as an available source of long chain polyunsaturated Omega 3 and Omega 6 fatty acids, especially eicosapentaenoic acid (EPA) and Docosa Hexaenoic Acid (DHA). Tuna oil differs from other fish oils in the ratio of the C20:5 n-3 (EPA) to the C22:6 n-3 (DHA) fatty acids. It means that the ratio of EPA: DHA in tuna oil around 1:4 is similar to that of human breast mil . This study attempted to find out the feasibility of producing Tuna fish oil using fish waste.
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    A Study on the Mangrove Crabs in Batticaloa District for Potential Export Market
    (Uva Wellassa University of Srilanka, 2011) Krithika, A.; Jayamanne, S.C.
    NOTE: see the PDF version Mangrove crabs live in association with mangrove forests and belong to many different species. They have been shown to be ecologically very significant animals which keep much of the energy within the forest by burying and consuming leaf litter. The edible mangrove crab Scylla serrata is a well-known commercial commodity considered to be among the tastiest of crab species and have a huge demand in South Asian countries. Most of the edible crabs belong to the family Portunidae and are swimming crabs but there are some grapsid crabs which are true dwellers of the mangrove forests that are edible. Grapsid crab, Episesarma sp. is such a delicacy consumed by the Thai people and by Chinese people in their cuisines (Ng and Sivasothi, 1999). Some Uca species and sesarmid crabs such as Perisesarma species which has deep red pincers and iridescent blue or green band across the face are considered as ornamental animals due to their beautiful colourations (Nyawira and Methiga, 1834). Sesarma bidens is another mangrove crab which is bred in aquariums as an ornamental animal (www.aquaticcommunity.com).Extensive mangrove forests are found in association with lagoons and estuaries of Sri Lanka but the studies on their fauna is limited (Priyadarshani, et al., 2008). The crabs dwelling in these mangrove environments are anticipated to have much potential to be utilized in various industries if they could be bred in captivity. Crabs with ornamental value can be bred in captivity and can take up to the ornamental aquaculture markets. The present study was carried out with an aim of finding the diversity and the export potential of the mangrove crabs in the Batticaloa District, Sri Lanka.