ENHANCEMENT OF GROWTH OF TILAPIA OREOCHROMIS-NILOTICUS IN ISOSMOTIC MEDIUM

Authors
WOO NYS NG TB LEUNG TC CHOW CY
Citation
Nys. Woo et al., ENHANCEMENT OF GROWTH OF TILAPIA OREOCHROMIS-NILOTICUS IN ISOSMOTIC MEDIUM, Journal of applied ichthyology, 13(2), 1997, pp. 67-71
Citations number
49
Categorie Soggetti
Fisheries,"Marine & Freshwater Biology
Journal title
Journal of applied ichthyology → ACNP
ISSN journal
01758659
Volume
13
Issue
2
Year of publication
1997
Pages
67 - 71
Database
ISI
SICI code
0175-8659(1997)13:2<67:EOGOTO>2.0.ZU;2-N
Abstract
Tilapia (Oreochromis niloticus) kept in 15 ppt seawater (roughly iso-o smotic salinity) had higher growth rates than fish kept in 0 ppt (fres hwater) or 30 ppt seawater, but circulating level of growth hormone wa s highest in fish exhibiting the poorest growth rate (30 ppt seawater) . Serum thyroxine concentration was highest in 15 ppt seawater. Intest inal trypsin may play a role in promoting growth in iso-osmotic salini ty since its activity was highest in fish cultured in 15 ppt seawater. The results indicate that changes in the digestive power, coupled wit h changes in thyroxine secretion, may account for the variations in gr owth rate in tilapia reared under different salinities.