The Israeli Journal of Aquaculture Bamidgeh 57(3), 2005, 156-163           
 
EFFECTS OF PHOTOPERIOD ON GROWTH AND FEED UTILIZATION OF JUVENILE BLACK SEA TURBOT (PSETTA MAEOTICA)

Ali Turker*

Department of Aquaculture, Faculty of Fisheries, Ondokuz Mayis University, Sinop 57000, Turkey
 
(Received 11.1.05, Accepted 20.5.05)

Key words: feed utilization, growth, juveniles, photoperiod, Psetta maeotica, turbot
 
Abstract


A study was conducted to determine the effect of different photoperiods on the growth and survival of juveniles of the Black Sea turbot (Psetta maeotica ). Juvenile turbot (32.170.1 g) were reared under one of three experimental photoperiod regimes: natural, continuous light, or extended light (18 h light:6 h dark). The turbot were held in sea water (18 ppt) at 15-24C from May 27 to July 29, 2004. The maximum growth rate, feed efficiency, and specific growth rate were recorded in the fish exposed to the extended light period(p<0.05). Continuous light may have acted as an irritant, inducing stress, suppressing growth, and reducing feed intake.


* E-mail: alit@omu.edu.tr

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