Reducing dependency on fish-based feed in marine fish farming

Rossita Shapawi and Awang Bono and Sariah Saalah (2012) Reducing dependency on fish-based feed in marine fish farming. (Unpublished)

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Three different experiments were conducted in the effort to develop practical feeds for farming the tiger grouper, Epinephe/us fascoguttatus using alternative feed ingredients. In the first experiment, the dietary protein and lipid requirement of tiger grouper was determined in a 3 x 3 factorial dietary design with 45 to 55% crude protein in 5% increments and 8 to 16% crude lipid in 4% increments for 8 weeks. The finding indicates that dietary protein and lipid can significantly affect the growth performance, feed utilization and survival of tiger grouper juveniles. The fish fed diet containing 50 % crude protein and 16% crude lipid had the highest weight gain, specific growth rate (SGR) and the best feed conversion ratio (FCR) among all the treatments. Apparently, increasing protein level to 55% did not promote better growth of the fish. It was noted that increasing the amount of lipid in the experimental diets to 16% has resulted in significantly higher body lipid. Therefore, careful consideration on the lipid level in practical diet of this species is needed if lean fish is to be produced. In the second experiment, a 16-week feeding trial was done to evaluate the possibility to replace fish meal (FM) with poultry by-product meal (PBM) at high inclusion levels (50 - 100%) in the feeds of juvenile tiger grouper. Replacement of fish meal with 50% PBM had produced the best growth performance and FCR and feeding with trash fish had resulted in significantly poorer FCR. Survival were not Significantly different (P>0.05) among all treatments. Similarly, apparent digestibility coefficients (ADCs) for dry matter were not significantly different among dietary treatments. However, ADCs for crude protein and lipid were affected by the dietary inclusion level of PBM. It can be concluded that PBM can be successfully used as a protein source in the diets for tiger grouper. In the third experiment, the performance of vegetable oils-based diet was evaluated in tiger grouper in a ten-week feeding trial. Fish fed diets with vegetable oils (refined, bleached and deodorized palm olein, RBDPO; canola, CNO; soybean oil, SBO; mixed vegetable oils, MIX) performed better in term of fish weight gain than those in control treatment (fish oil, FO). FCRs were not affected by dietary treatments and these values were not significantly different among all diets. Therefore, it can be concluded that the dependency of marine fish farming on fishbased feeds can be reduced when diets are carefully formulated to meet the nutrient requirement of the target species.

Item Type: Research Report
Keyword: Tiger grouper, Epinephe/us fascoguttatus , fish , aquaculture
Subjects: S Agriculture > SH Aquaculture. Fisheries. Angling
Depositing User: NORAINI LABUK -
Date Deposited: 01 Aug 2019 16:26
Last Modified: 14 Aug 2020 15:54

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