Effects of lipid on growth and feed utilization of Heterobranchus longifilis fingerlings
A study was carried out to examine the effect of lipid level on growth and feed utilization of Heterobranchus longifilis. Fingerlings of H. longifilis (28 days old (0.7 ~c 0.05g) were fed three formulated diets with three levels of lipid (7.00%, 12.5% and 18.0% of dry matter) at one level of protein (35.0% crude protein dry matter (OM) basis) for eight weeks. Weight gain (g) and specific growth rate (SGR, % day-1) values indicated that fish fed diets with 7.0% and 12.5% lipid exhibited higher growth performance. Lowest growth was recorded for fish fed diet with 18.0% lipid. Feed intake (FI, g fish-1) was also significantly (P < 0.05) affected by dietary lipids and tended to decrease with increasing lipid levels. Fish that showed the highest FI were those that were fed the 7% and 12.5% lipid diets. Feed conversion ratio (FCR) values indicated that diets containing 12.5% and 18% lipid were more efficiently utilized. No significant differences in muscle composition were observed among fish fed the different diets. There was a linear relationship (P<0.05) between dietary lipid level and liver lipid. Hepatosomatic index (HIS) increased with dietary lipid level. The results indicated that H. longifilis fingerlings performed best with the diets containing 7.0% and 12.5% lipid when protein concentration was 35.0% and, reduced growth and increased body fat were evident when dietary energy increased from 19.06 to 20.54 kJg-1.
| Main Authors: | , |
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| Format: | conference_item biblioteca |
| Language: | English |
| Published: |
Fisheries Society of Nigeria
2007
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| Subjects: | Aquaculture, Heterobranchus longifilis, Nigeria, Feed Utilization, freshwater environment, Fish culture, Lipids, Growth, Feed efficiency, Feeding experiments, |
| Online Access: | http://hdl.handle.net/1834/37755 |
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