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Gonado-somatic index (GSI) of Nemipterus japonicus was studied during the period August 2003 – January 2004. Size wise gonadal maturation was determined quantitatively by gonodo-somatic index in both sexes. A positive relationship between GSI values and stages of development of gonad was found. High GSI values at 230-260 mm TL in males and at 210 mm, 220 mm, 230-250 mm and 270 mm TL in females indicate the cent percentage maturation.

The pattern of food and feeding habits Cynoglossus bilineatus was studied during the period from June 2009 to May, 2010, using points methods. The composition of food of different size groups and seasons was calculated. Analysis of fullness of stomach revealed gorged – full constituted 2.02 %, 3/4 full 2.95 %, 1/2 full 11.03 %, 1/4 full 27.64 %, barely full 53.42 % and empty 2.95 % in a year. Analysis of stomach contents showed the occurrence (in percentage) of polychaetes 17.96%, crustaceans 10.47%, mollusks 6.21%, fish 0.51%, sand-mud 9.53% and miscellaneous items 55.32%. Total points of fish were determined to be 16.89% for polychaetes, 7.71% for crustaceans, 4.92% for molluscs, 1.24% for fish, 4.30% for sand-mud and 64.94% for miscellaneous items.