INTERNAL REPORT 155 THE FOOD AND FEEDING CHRONOLOGY OF YELLOW PERCH

The food habits of yellow perch in Lake Washington were studied over a period of nine months. ' Altogether, 549 yellow perch were examined for the stomach contents. The food consisted mainly of cottids, mysid shrimp, and chiron-omid pupae and larvae; the predominant food item being the mysid shrimp. There was no difference in the food consumed between the different sexes and between the different size groups. However, a considerable seasonal vari-ation in the consumption of different food items was seen. Maximum feed-ing by perch during the day was observed just before dusk, and the daily ra-tion was calculated to be about 0.014 grams per gram of body weight