Southwards cultivation and nutrition composition analysis of Marphysa maxidenticulata

In this paper, we investigated the growth condition and nutritional composition of Marphysa maxidenticulata cultured in Beihai by using the "northern worm and southern cultivation" method. The results show that the average body length of M. maxidenticulata grew up to (12.66±1.52) cm and the average body mass was (2.30±0.86) g within 240 d. The specific growth rate of M. maxidenticulata in mud sediments was significantly higher than that of the coarse sands at the early phase of culture, but the late phase of culture was just opposite. The results of nutrition composition analysis show that the nutritional composition contained 18 species amino acids in both cultured M. maxidenticulata in Beihai and wild M. maxidenticulata in Rushan, but their contents were significantly different (P<0.05). The contents of total amino acid, delicious amino acid, non-essential amino acid, semi-essential amino acid and essential amino-acid of cultured M. maxidenticulata in Beihai were higher than those of wild M. maxidenticulata in Rushan. In terms of fatty acid composition, 27 fatty acids had been determined in both cultured and wild M. maxidenticulata, and palmitic acid and oleic acid were the main fatty acids. There was no significant difference in the contents of saturated fatty acids and polyunsaturated fatty acids between cultured M. maxidenticulata in Beihai and wild M. maxidenticulata in Rushan. But the content of total monounsaturated fatty acids of cultured M. maxidenticulata in Beihai was significantly higher than that of wild M. maxidenticulata in Rushan (P<0.05).