Changes of gonadosomatic index (GSI) and egg diameter in the grayling Thymallus thymallus (L.) in annual cycle
Дата
Авторы
Witkowski,A.
Błachuta,J.
Kokurewicz,B.
Kowalewski,M.
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Pensoft Publishers
Аннотация
Описание
The most intense growth of grayling ovaries takes place in autumn and winter (September-March), of testes-in summer (July-September). Older females and males all seasons have a higher GSI, and the diameter of developing eggs is higher.