Jerzy SZYPUŁA1,
Jerzy Ostrowski2,
Piotr
Margońskii2
and Alina Krajewska-Sołtys2
1Academy
of Agriculture, K. Królewicza 4, 71-550 Szczecin, Poland
2Sea
Fisheries Institute, Kołłątaja 1, 81-332 Gdynia, Poland
Key words: herring, sprat, Baltic, food composition, feeding intensity, food selectivity.
Abstract.
The research related to the influence of the seasons and depth of making
a catch, as well as the size of feeding fish, upon the amount and composition
of their food. The second basic objective was to determine the availability
of particular food components by comparing the food composition of herring
and sprat with the set of species constituting the so-called food complex
of the fish examined (species potentially being food components). Food
investigations were aimed at a possibly precise determination of the utilization
rate of forage reserves of herring and sprat in the southern Baltic.