Effect of Salinity on Growth, Feed Utilization, and Survival of Tilapia rendalli Under Laboratory Conditions

Juvenile T. rendalli were evaluated for 10 weeks to determine the effect of salinity on growth, feed utilization, and survival in tanks. Fish weighing 3.94 ± 0.44 g were stocked into twelve 50-L rectangular tanks at 15 fish /tank. The fish were raised in three salinity levels (5, 10, 15[per thousand...

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Bibliographic Details
Published in:Journal of applied aquaculture 2008, Vol.20 (4), p.256-271
Main Authors: Kang'ombe, Jeremiah, Brown, Joseph A
Format: Article
Language:English
Subjects:
animal growth
aquaculture tanks
body composition
body weight
digestibility
feed composition
feed conversion
feed intake
feed utilization
fish culture
growth
liveweight gain
mortality
Salinity
survival
tilapia (common name)
Tilapia rendalli
water quality
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Summary:Juvenile T. rendalli were evaluated for 10 weeks to determine the effect of salinity on growth, feed utilization, and survival in tanks. Fish weighing 3.94 ± 0.44 g were stocked into twelve 50-L rectangular tanks at 15 fish /tank. The fish were raised in three salinity levels (5, 10, 15[per thousand], and freshwater as a control). There were three replicate tanks per treatment. After the feeding experiment, a digestibility trial was conducted for two weeks. After 70 days, fish in the 10[per thousand] treatment grew significantly larger (P < 0.05) than those in 5[per thousand], 15[per thousand], and freshwater. T. rendalli cultured in 10[per thousand] had significantly lower feed conversion ratios and higher feed conversion efficiency and protein efficiency ratios. Survival of the fish was significantly (P < 0.05) different and depended on salinity level. The apparent digestibilities of crude protein, fat, ash, and gross energy were significantly higher (P < 0.05) in T. rendalli cultured in the 10[per thousand] salinity treatment. However, apparent digestibility of dry matter did not differ significantly (P < 0.05) between 10[per thousand] and 5[per thousand]. The results obtained indicate that 10[per thousand] is optimal for T. rendalli in tank culture.
ISSN:1045-4438
1545-0805
DOI:10.1080/10454430802498229