Studies On Protein And Lipid Requirement Of Babylonia Areolata Link

The gastropod Babylonia areolata Link is one of the important commercial marine animals in the southeast coasts of China, and much attention has been received in aquaculture in recent years. Firstly, the nutritional compositions of B. areolata Link and B. formosae habei Altena&Gittenberger were analyzed. And the ratio of flesh of Babylonia were determined, and muscle of nutritional compositions, amino acid compositions and contents, fatty acid compositions and relative contents were analyzed. Then, a 60-day growth experiment was conducted in order to investigate the protein requirement for the growth of B. areolata whose initial weight was 2.16±0.05g, at the temperature of 26.90±1.52℃and the salinity of 27.6±0.5‰. White fishmeal and casein were used as the main dietary protein source to formulate experimental diets at eight protein levels. After 60-day growth experiment, the nutritional compositions of flesh and the main digestive enzymes activities of B. areolata were analyzed. Lastly, based on the studies on protein requirement of B. areolata, a 60-day growth experiment was conducted in order to determine the dietary lipid requirement for the growth of B. areolata whose initial weight were 1.95g or so , at the temperature of 28℃to 30℃and the salinity of 25 to 28‰. White fishmeal and casein were used as the main dietary protein source and fish oil was used as the main lipid source to formulate experimental diets at five lipid levels. The results were showed as following:1. Analysis and evaluation of nutritional composition of B. areolata and B. formosae habeiB. areolata and B. formosae habei ratio of flesh were 48.94±2.01% and 45.12±2.29%, respectively. And with high protein and low fat, sugar near 10% and with rich variety of amino acids and with high essential amino acid relative contents, the essential amino acid indexs were over 43. The taste of flesh was delicious .The relative contents with EPA and DHA of muscle were high. The relative contents with n-3 and n-6 PUFA of muscle were high. They are rare and nutritional seafood.