Feeding trash fish

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  • Farming of groupers (members of the Serranidae, subfamily Epinephelinae) is widely practised in Asia, particularly in the tropical East (China, Hong Kong SAR, Taiwan Province of China) and Southeast Asia (Indonesia, Malaysia, the Philippines, Singapore, Thailand, and Vietnam). Most grouper species bring high prices in local or export markets, and thus are an attractive culture proposition for coastal aquaculture farmers.

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  • Tiger shrimp (P. monodon) and marine fishes are common fish cultured in coastal area of Vietnam. The study on nutrition for such species has not much when compared to freshwater fish species. Trash fish is the traditional feed for marine cultured fish and tiger shrimp in semi-intensive system. The supply is not stable in term of quality and quantity. Moreover, the price has increased. Therefore, finding alternative feed for trash fish is very important and crucial issues Using pellet feed in which fishmeal was replaced by plant protein that started in 90’s decade.

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  • At Tan Thanh ward, Ca Mau city, Ca Mau province, marble goby (Oxyeleotris marmorata) was cultured at low stocking density of 1 –2 fish/m2 with the average size of 7 – 15 fish/kg. Trash fish, mainly tilpia were used to feed marble goby. After 10 -14 cultured period, marble goby reached 500 – 800 g/ fish. The most problem for marble goby farmer met were seed quality and lack of seed.

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  • To obtain the best practical diet (in terms growth rate, survival rate, feed conversion ratio and water quality) which can replace the Vital feed (an expensive feed for Kuruma prawn) and trash fish under laboratory conditions. Activities 1. Conduct Experiment 1: to test three practical diets: a) the "best" diet from Vu-anh Tuan' s PhD research; b) Diet a) plus additives (e.g., vitamins and minerals); and c) Diet b) with further supplement (e.g., vitamins and minerals plus mixed enzymes). 2.

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