The study on food and feeding habit of the Japanese whiting, Sillago japonica, were conducted. Stomach contents were examined from 442 fish (varied from 115 mm to 245 mm total body length) collected using encircling trammel net from October 1993 to January 1995 in Tateyama Bay. All samples were distinguished to be male (n=227) and female (n=215). Monthly changes on the index of stomach contents (ISC) indicated that feeding became active from April (0.39) to September (0.45) and decreased during

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... October to March. Four phyla of organisms were found in the stomach of the samples, which were Arthropoda, Mollusca, Annelida and Chordata. Major diets of fish were Natantia (shrimps) and Polychaeta which constituted of 44% and 33% in female and 40% and 34% in male, respectively. Stomach contents of male and female were similar. They varied according to the sampling month and season. The feeding incidence on Natantia increased corresponding to size in both female and male.