Open AccessAbnormalities in the ovaries of sockeye salmon spawners in the Kamchatka River in 2019
Author(s) -
S. B. Gorodovskaya,
L. N. Smorodina
Publication year - 2021
Publication title -
issledovaniâ vodnyh biologičeskih resursov kamčatki i severo-zapadnoj časti tihogo okeana/issledovaniâ vodnyh biologičeskih resursov kamčatki i severo-zapadnoj časti tihogo okeana
Language(s) - English
Resource type - Journals
eISSN - 2782-6236
pISSN - 2072-8212
DOI - 10.15853/2072-8212.2021.60.69-73
Subject(s) - vitellogenesis , resorption , biology , oocyte , fishery , fish <actinopterygii> , zoology , reproduction , mechanism (biology) , fertility , endocrinology , ecology , medicine , embryo , population , environmental health , philosophy , epistemology
Based on histological analysis of the ovaries of sockeye salmon spawners in the Kamchatka River, numerous abnormalities leading to resorption are shown in the structure of vitellogenic oocytes. Fertility of mature female sockeye salmon decreases due to the resorption of the vitellogenic oocytes. Presence of ovaries with abnormal oocytes implies oocyte resorption in fish being a phenomenon associated with mechanism of natural regulation of final fertility. Such mechanism is required in view of changing fish body length and weight in the sockeye salmon of the Kamchatka River. Numerous abnormalities in the ovaries indicate of a decreasing reproductive capacity of spawners and commercial quality of the eggs.