The effect of different pH and photoperiod regimens on the survival rate and developmental period of the larvae of Portunus pelagicus (Decapoda, Brachyura, Portunidae)

摘要

Crustacean larval development occurs within a narrow range of environmental parameters (Sastry, 1983). Among the abiotic characteristics that influence the developmental period and survival rate of the larvae, p H and photoperiod are of great importance. High and low levels of p H are known to adversely affect the physiology of the animals due to the increased amounts of ammonia and nitrite (Oanh et al., 2000).