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The effects of food, temperature, salinity, and rearing density on the survival and growth of the swimming crab Portunus trituberculatus, were studied. With regard to food, the larval survival rate to zoea IV was the highest (53.9%) in the mixed feed group (rotifers+ Artemia), followed, in order, by the rotifer, commercial feed, and Artemia groups. The growth of young crabs reared on different diets was the highest in group VI. The survival rate to zoea II at 20 to 30℃ ranged between 77.2% and 83.1%, and was the highest for crab I (17.3%) at 25℃. When young crabs were cultured individually at four different temperatures (20, 25, 30, and 35℃), the growth did not differ significantly at 25 to 30℃, but was higher than at 20℃. The survival rate of larvae to crab I was 12.7 and 11.4% at 25 and 28 psu, respectively, while all of the larvae died at 15 psu. For young crabs, there was no significant difference in growth and survival from 20 to 30 psu. The survival rate decreased with increasing rearing density from zoea I to crab I. Each molting cycle took 1 month from crab I to VIII. Subsequently, the interval increased with growth. The mean body weight of crab XV after 24 months was 428.05± 57.63 g.

Effects of Culture Conditions on the Survival and Growth of Larvae and Young Swimming Crabs Portunus trituberculatus (Miers)