The lsraeli Joumal of Aquaculture - Bamidgeh 50(4), 1998, 184-194

EFFECT OF TEMPERATURE ON FEED RESPONSE,
GROWTH PERFORMANCE, AND MUSCLE PROXIMATE
COMPOSITION IN JUVENILE HYBRID STRIPED BASS
(MORONE SAXATILIS x M. CHRYSOPS)


Fu-Guan Liu¹,², Shenn-DerYang² and Hon-Cheng Chen¹

1 Institute of Zoology, National Taiwan University, Taipei 107, Taiwan, R.O.C.

2 Chupei Branch, Taiwan Fisheries Research Institute, Chupei 303, Taiwan, R.O.C. Tel. 886-3-S551190 Fax 886-3-5552057

(Received12.2.98, Accepted 15.10.98)

Abstract

This study was carried out over a period of 64 days to examine the effects of three levels of environmental temperature (18, 23, and 28C) on the growth performance of hybrid striped bass (Morone saxatilis x M. chrysops). Sixty juveniles of 31 g were placed into each of six tanks (m³/tank) with two replicates per treatment. Fish were fed to satiation twice a day with a commercial floating pelleted diet. Specific growth rate (SGR) and feed intake both increased with increasing temperatures. The feed conversion efficiency (FCE) was much lower at 18C than at 23 C and 28C; the highest FCE was obtained at 23C and slightly dropped at 28°C. With increasing temperature, there was a significant decrease in muscle moisture, but an increase in lipid content. The liver glycogen at 28C was markedly lower than at other temperatures, while the hepatosomatic index and condition factor were slightly lower at 18C than those at the higher temperatures. The variance in harvest size distribution was much larger at 28C than at the lower temperatures. In terms of SGR and FCE, it can be concluded that the most economical temperature for aquaculture of this species is between 23 and 28C.


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