. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. JUNE SEPTEMBER OCTOBER NOVEMBER [HUPhytoplankton ISSS Rotatoria dZlPolychaeta larvae ESPolychaeta DUCIadocera â â Copepoda '""ICirripedia larvae HillMysidacea SEPTEMBER OCTOBER :23Mollusca larvae 5SZ! Hydrobia ^H3Fish larvae ANCHOVY SEA OF AZOV. MARCH APRIL- MAY BAY OF TAGANROG AUGUST SEPTEMBER APRIL-MAY AUGUST CLUPEONELLA SEPTEMBER OCTOBER NOVEMBER DECEMBER [â ]â¢'] Phytoplankton Щ Rotatoria pq Polychaeta larvae Ol Cladocera IB Copepoda ÑÑ] Cirripedia larvae E3 Mysidacea E*3 Amphipoda L
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. JUNE SEPTEMBER OCTOBER NOVEMBER [HUPhytoplankton ISSS Rotatoria dZlPolychaeta larvae ESPolychaeta DUCIadocera â â Copepoda '""ICirripedia larvae HillMysidacea SEPTEMBER OCTOBER :23Mollusca larvae 5SZ! Hydrobia ^H3Fish larvae ANCHOVY SEA OF AZOV. MARCH APRIL- MAY BAY OF TAGANROG AUGUST SEPTEMBER APRIL-MAY AUGUST CLUPEONELLA SEPTEMBER OCTOBER NOVEMBER DECEMBER [â ]â¢'] Phytoplankton Щ Rotatoria pq Polychaeta larvae Ol Cladocera IB Copepoda ÑÑ] Cirripedia larvae E3 Mysidacea E*3 Amphipoda LD Mollusca larvae ШРFish larvae SEPTEMBER Fig. 248. Food spectra of (A) anchovy and (B) Clupeonella in the Sea of Azov and their changes during the year. The area of the circle corresponds to the value of the repletion index. White sector within the circle is the percentage of empty stomachs (Okul, 1941). 40 per cent in anchovy, 56-5 per cent in Atherina). For herring, however, Copepoda are not an important item of diet. In spring Rotifera constitute a large part of the food of fish, ranging from 25 to 63 per cent for Clupeonella and up to 21 per cent for anchovy. For a short period in June (at the time of their mass occurrence) Cirripedia larvae may acquire an important place in the nutrition of plankton-eating fish; anchovy food includes 33 to 37 per cent of them, that of Clupeonella 25 per cent, of Atherina 10 to 14 per cent and of herring 4 per cent. In spring and autumn Mysidacea (mainly Macropsis slabberi) plays an important role in the nutrition of Atherina and herring, forming 31 to 47 per cent and 21 per cent of the whole content of stomachs of herring and Atherina respectively. Mollusc larvae have little feeding value for fish (1 to 4 per cent). Herring eat large numbers of fish fry and young Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of the
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