Fish soup versus fish mince: a rapid autoclave method for preparing fish flesh for chemical analysis

Barramundi Lates calcarifer reared in cool water (202 2 1C) grow slowly and feed is used poorly compared with ¢sh in warm water (28^32 1C). Two comparative slaughter growth assays were carried out with juvenile barramundi to see if increasing the digestible energy (DE) and/or the n-3 highly unsaturated fatty acid (n-3 HUFA) content of the feed would improve growth of ¢sh raised in cool water. Increasing the DE content of the feed from 15 to 17 or 19 MJ kg À1 while maintaining a constant protein to energy ratio in Experiment 1 brought about signi¢cant improvements in feed conversion ratio (FCR) (from 2.01 to 1.19) and daily growth coe⁄cient (DGC; from 0.69 to 1.08%/day) for ¢sh at 20 1C. For ¢sh at 29 1C, improvements, while signi¢cant, were of a lesser magnitude: from 1.32 to 0.97 for FCR and from 3.24 to 3.65%/day for DGC. Increasing the absolute amount of dietary n-3 HUFA, expressed as the sum of eicosapentaenoic and docosahexaenoic fatty acids, from 0.5% to 2.0% in Experiment 2 improved DGC linearly and FCR curvilinearly for ¢sh at 29 1C whereas at 20 1C, DGC was not a¡ected while FCR improved slightly (from1.83 to 1.68). Feed conversion ratio was optimized with a dietary n-3 HUFA of about 1.5%. Providing barramundi with a feed that is high in DE (viz 19 MJ kg À1 ) and a digestible protein to DE ratio of 22.5 g MJ À 1 is a practical strategy for improving the productivity of barramundi cultured in cool water whereas increasing dietary n-3 HUFA conferred very little additional bene¢t.

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Evaluation of rendered animal protein ingredients for replacement of fish meal in practical diets for gibel carp,Carassius auratus gibelio(Bloch)

Wang

Luo

et al. 2008

Aquaculture Research

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A 12-week feeding trial was carried out in ¢breglass tanks to examine partial replacement of ¢sh meal (FM) with poultry by-product meal (PBM), meat and bone meal (MBM) and blood meal (BM) in practical diets for gibel carp Carassius auratus gibelio (Bloch). Triplicate groups of ¢sh (initial body weight 15.3 g ¢sh À 1 ) were fed eight isonitrogenous (crude protein: 37.5%) and isolipidic diets (crude lipid: 7%). The control diet is the commercial diet of gibel carp, which used 18% of FM as the sole animal protein source. In the other seven diets (Diet 2^Diet 8), 17^83% of FM protein was substituted by a blend of PBM and BM or a blend of PBM, MBM and BM. The ¢nal body weight and thermal-unit growth coe⁄cient of ¢sh fed the feeds in Diet 8 in which 83% of FM protein was replaced by the blend of 3% BM, 10% PBM and 5% MBM is signi¢cantly lower than Diet 1 (the control). The feed e⁄ciency ratio in Diet 8 group is signi¢cantly lower than Diet 1, 2, 4 and 7 groups. The results of the present study indicated that a combination of PBM, BM and MBM can replace most of the FM protein and the FM level can be reduced to about 6% with satisfactory growth and feed utilization in practical diets for gibel carp.

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Fish soup versus fish mince: a rapid autoclave method for preparing fish flesh for chemical analysis

Cited by 3 publications

References 7 publications

Replacement of fish meal by rendered animal protein ingredients with lysine and methionine supplementation to practical diets for gibel carp, Carassius auratus gibelio

Replacement of fish meal by rendered animal protein ingredients with lysine and methionine supplementation to practical diets for gibel carp, Carassius auratus gibelio

Dietary composition manipulation to enhance the performance of juvenile barramundi (Lates calcarifer Bloch) reared in cool water

Evaluation of rendered animal protein ingredients for replacement of fish meal in practical diets for gibel carp,Carassius auratus gibelio(Bloch)

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