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- Title
Performance of juvenile Murray cod, Maccullochella peelii peelii (Mitchell), fed with diets of different protein to energy ratio.
- Authors
DE SILVA, S.S; GUNASEKERA, R.M; COLLINS, R.A; INGRAM, B.A
- Abstract
The results of a 56-day experiment on juvenile Murray cod, Maccullochella peelii peelii , an Australian native fish with a high aquaculture potential, of mean weight 14.9 ± 0.04 g, fed with five experimental diets, one a series of 40% protein content and lipid levels of 10, 17 and 24% (P40 L10 , P40 L17 and P40 L24 ), and another of 50% protein and 17 and 24% (P50 L17 and P50 L24 ) lipid are presented. The specific growth rate (SGR) (% day-1 ) of fish maintained on different diets ranged from 1.18 to 1.41, and was not significantly different between dietary treatments, except P40 L10 and the rest. However, there was a general tendency for SGR to increase with increasing dietary lipid content at both protein levels. The food conversion ratio (FCR) for the 40% protein series diets were poorer compared with those of the 50% protein diets, and the best FCR of 1.14 was observed with the P50 L17 diet. The protein efficiency ratio (PER), however, was better in fish reared on low protein diets. The net protein utilization (NPU) also did not differ significantly (P > 0.05) in relation to dietary treatment. As in the case of PER the highest NPU was observed in Murray cod reared on diet P40 L24 and the lowest in fish fed with diet P50 L24 . The carcass lipid content reflected that of the diets, when significant increases in the lipid content was observed in relation to dietary lipid content at both protein levels. However, body muscle lipid content did not increase with increasing dietary lipid content, and was significantly lower than in the whole body. The fatty acids found in highest concentration amongst the saturates, monoenes and polyunsaturates (PUFAs) were 16 : 0, 18 : 1n-9 and 22 : 6n-3, respectively, and each of these accounted for more than 60% of each...
- Subjects
MURRAY cod; PROTEINS; LIPIDS; NUTRITION
- Publication
Aquaculture Nutrition, 2002, Vol 8, Issue 2, p79
- ISSN
1353-5773
- Publication type
Article
- DOI
10.1046/j.1365-2095.2002.00191.x