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Molluscs are one of the most preferred ingredients for marine lobster feed because the mollusc has a higher protein content. Therefore, this material has the potential to substitute the fish meals and reduce the cost for feeding lobsters. The objective of the present study was to investigate digestive enzyme activities and growth performance of painted spiny lobsters fed with a combination of mollusc meal and fish meal in the diet. Four experimental diets were formulated to contain 20% sardine fish meal and 20% mackerel fish meal (Diet A). 10% Telescopium muscle meal (TMM) + 15% golden snail meal (GSM) + 15% scallops muscle meal (SMM) (Diet B). 15% TMM + 10% GSM + 15% SMM (Diet C) and 15% TMM + 15% GSM + 10% SMM (Diet D). A total of 24 juvenile painted spiny lobsters were distributed into twelve plastic tanks (two lobsters/tank) with a size of 60 × 45 × 60 cm³ and reared in a recirculating system for a 50-day rearing period. The lobster was fed only one time a day (05:00 pm) with a dosage of 3% biomass weight. The results showed that the enzyme activities of lobsters fed with combined mollusc meals were higher than the enzyme activity in the lobsters fed with the fish meal combination diet. The weight gain of the painted spiny lobster fed with mollusc meal was higher than the lobster fed with a fish meal diet. Based on results of enzyme activities and growth performance. It was concluded that the combination of mollusc meal in the formulated diet was more suitable than the combination of fish meal for optimum enzyme activities and growth performance of painted spiny lobster

Spiny lobster is an economically important marine fish commodity that has a high price and one of the important protein source for people worldwide. The quality of the protein is strongly depending on the amino acid compositions and concentrations. This study aimed to determine of amino acid profiles and growth of spiny lobster (Panulirus ornatus) fed with the diet contained combination of three mollusk meal. Four experimental diets were prepared to contain of 40% fish meal,FM (Diet A), 15% telescopium meal, + 15% gold snail meal + 10% scallops meal (Diet B), 15% telescopium meal + 10% gold snail meal + 15% scallops meal (Diet C), 10% telescopium meal + 15% gold snail meal + 15% scallops meal (Diet D) in the test diet. A total of 36 spiny lobster juvenile (initial weight : 120± 15,38 g) were distributed into twelve plastic tanks (three lobster/ tank ) with sized of 60×50 ×50 cm. Feeding the lobster two times a day (08.00 a.m and 05.00 p.m) in dosage of 8% total biomass weight for 60 days of rearing period. The experiment was designed by using completely randomized design with four treatments and three replications. Collecting data included of weight gain, survival rate, and amino acid content in the fish body. The results showed that feeding the lobster with different feed test was significantly different in weight gain of spiny lobster. The weight gain of spiny lobster fed with combination of mollusk meal had higher than the feed contain fish meal. The highest amount level of amino acid in the lobster body was leucine , while the lowest one was tryptophan. The types and total number of some amino acid profiles in the fish body was similarly with amino acid profile in the diets which contained mollusk meal. This study concluded that the amino acid profiles in the diet contained mollusk meal were suitable for requirement to improve the growth of spiny lobster.