Biochemical Composition Of The Squid (Loligo Vulgaris) (Mollusca) From The Mediterranean Waters Off Alexandria, Egypt

Abstract

The seasonal biochemical variations of the squid Loligo vulgaris from the Egyptian Mediterranean waters off Alexandria were studied during November 1989 through August 1990. Water, lipid, protein and ash contents were determined in the mantles of 353 individuals representing a wide range of sizes of both males and females. Average monthly values of these parameters in both sexes followed approximately the same trends. An increase in body water was noticed in spring and early summer. Maximum mantle lipid values were recorded during August-November and minimum values in December-July. Lipid contents were positively correlated with mantle length except in summer where a negative correlation was found. A clear reverse relationship between water and lipid contents was evident. Protein contents were minimal during autumn and winter and showed an increase in spring and early summer. Ash contents of males and females showed irregular patterns. The relationships between body composition and animal size was discussed. The seasonal variations in those compositions in relation to gonads developments were also discussed.