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)
This study was carried out over a period of 64 days to examine the effects of three levels of environmental temperature (18°, 23°, and 28°C) 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 18°C than at 23° C and 28°C; the highest FCE was obtained at 23°C 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 28°C was markedly lower than at other temperatures, while the hepatosomatic index and condition factor were slightly lower at 18°C than those at the higher temperatures. The variance in harvest size distribution was much larger at 28°C 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 28°C.