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Research about the nutrition of 363 specimens of Halte, 79 of Bogue, 282 of Striped mullets and 259 species of Pandora, has been carried on the bisis of the trawler catches which were realised during 1963/64 year in the bay of Kastela. Examinations were performed in relation to the qualitative and quantitative composition of the food, seasonal changes of food, as well as the influence of the temperature to the change of food quantity in the stomach. By the qualitative analysis of the food structure it was oftenly possiblr to determine the organisms up to the genus or species. In order to find out the quantity of food in the stomach we used the degree of stomach fullness according to which: A empty stomach, B = very little amount of food, C = half of the stomach filled with food, D = completely stomachfull with food, E = the wall of stomach thin owing to the abundance of food. The material for the xamination was immcdiately preserved in 10% formalin on thc vessel and few days later the qualitative-quantitative analysis was performed in the laboratory. ....