Effect of different Photoperiod and light intensity on the pineal gland size in broodstock of white spotted rabbit fish (Siganus sutor)

This research carried out to study the effects of light intensity and photoperiod on the size of pineal gland of siganus sutor. Nine experimental treatments of artificial lighting conditions including of three different photoperiods (16L/8D), (12L/12D), (8L/16D) and three levels of light intensity including 1000, 2000 and 3000 lux arranged. Natural light sued for control treatment and duration of experiment was 60 days, and research carried out in Persian Gulf Ecological Fisheries Research Center in Bandar Abbas. At the end of study, pineal organs extracted and size and volume of gland measured by using stereomicroscope. The results showed that, volume of control treatment was higher than other treatments, but the difference was not significant (P>0.05).