Abstract
Five experiments described below related to growth and survival of Penaeus japonicus fed a 76.1.1.0 pelleted diet. Pellets were given at different hours of the day according to the behaviour of the species. The hour of food distribution played a major role on the loss of soluble nutrients from the pellets into water. Owing to effect of leaching, extended stay in water could decrease the nutritional quality and value of the pellet to shrimp and consequently reduce the level of food consumption by the shrimp. P. japonicus comes out from the sand at night, between 17.00 and 20.00 h, according to season or experimental photoperiod. It lives in burrows during day time. Food was given either at 17.00, 20.00 or 22.00 h by means of an automatic feeder or by hand. Water stability of pellets seems to be between 7 and 20% loss of dry matter after 1 h. Nevertheless the nutritional qualities and freshness of pellets were significantly improved when the time lag between food distribution and start of night time activities of the shrimp was shortened.
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