EFFECT OF PHOTOPERIOD ON GROWTH INDICES, STRESS AND BIOCHEMICALS LEVELS IN ONE YEAR OLD REARED BELUGA STURGEON (HUSO HUSO)

摘要

Beluga ( Huso huso ) is one of the most important species of sturgeon in Caspian sea . The production of them for meat has been increasing recently in Iran (Bahmani, 1998) because of their high growth rate (Keyvan, 2003). Potoperiod has been considered one of the most important growth promoting factor in several fish species (Boeuf and Le Bail, 1999). More information is required about the different techniques and physiological condition of its culture to contribute to a better management and development . This study was designed to examine the effect of photoperiod on growth rate in one year old reared beluga and their physiological responses to different light regimes for the first time.