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• Assessing the Effective of Feed Added with Mixed of Enzymeto Culture Rainbow Trout (Oncorhynchus mykiss) at the First Commercial Stage

  Nguyen Thi Trang, Do Huu Quynh, Tran Dinh Luan

  Received: 17-04-2012 / Accepted: 02-06-2012

   Abstract PDF (VIETNAMESE)

  Adding enzyme in feed in order to increase food digestibility, reducing pollution and increasing economical efficiency are being focused in fish nutrition research in recently. The rainbow trout at the size from 150 g to 450 g were cultured to evaluate the effect of the addition of enzymes to the feed for rainbow trout. This study used 3 different feed formulations: feed without enzyme supplement (CT1), feed was added with mixed of 6000 IU amylase, 2000 IU protease and 2000 IU phytase/1 kilogram (CT2) and a feed control RAISIO - Finland (CT3). The results shown that the survival rates are more than 97%. The Average Daily Growth rate (g/fish/day) of CT1 was 3.18, CT2 was 3.48, CT3 was 3.65 and significant difference (P < 0.05). The Food Comsumption ranged from 343 to 360 g of feed/fish and there was no significant difference between the three feed formulars (P > 0.05). The Food Conversion Ratio ranged from 1.12 to 1.31 and there was no significant different between CT2 and CT3  (P > 0.05). The initial research results show that food added enzyme is better than it did not added enzyme and can replace for imported feed to culture rainbow trout at the size of 150-450 g.

• Using Formulated Diets for Growth-Out Trial of Bragid Catfish (Mystus nemurus) in Cages in Reservoir at Yen Thanh District, Nghe An Province

  Nguyen Quang Huy, Nguyen Thi Hong Tham, Tran Minh Hieu, Nguyen Duong Duc, Phan Gia Thanh, Tong Hoai Nam

  Received: 28-03-2012 / Accepted: 25-05-2012

   Abstract PDF (VIETNAMESE)

  Four isoenergic feed pellets of different protein and lipid levels, namely D1 (35% Pr, 10% L), D2 (42% Pr, 10% L), D3 (42% Pr, 5% L) and D4 (35% Pr, 5% L), were used to investigate the growth of bagrid catfish Mystus nemurus in cages breed in water reservoir in Yen Thanh, Nghe An. Experimental fish of initial size of 47.0 ± 1.2 g were fed twice a day to satiation in 85 days. Fish fed on diet D2 which contained the highest protein and lipid levels showed the best growth rate and the lowest feed conversion ratio (P <0.05). Fish fed on D4 diet with the lowest in protein and lipid content yielded the lowest growth rate and protein efficiency ratio and the highest feed conversion ratio (P <0.05). Fish fed on diet D3 gave similar growth rate, protein efficiency ratio to those fed on diet D1 but had a lower feed conversion ratio (P <0.05). Survival rates of fish from all feed treatments were high (93.0-96.0%) and no significant difference was found among treatments. Based on these results, diet D2 (42 % protein and 10 % lipid) was recomended for maximizing growth rate and feed utilization of Mystus nemurus.