Effect of photoperiod and light intensity on larval rearing of bluefin tuna Thunnus thynnus

One of the most important conditions affecting survival and growth in larval rearing are light conditions. In the case of bluefin tuna these factors are still more important so that Miyashita (2006) has mention the night time sinking death like one of the main reasons of early mortality and it is also well known the poor scotopic vision of bluefin tuna larvae (Ishibashi et al., 2009). This paper tries to find out the effect of the photoperiod and also light intensity on bluefin tuna larval rearing.