Changes of gonadosomatic index (GSI) and egg diameter in the grayling Thymallus thymallus (L.) in annual cycle
oleh: A. Witkowski, J. Błachuta, B. Kokurewicz, M. Kowalewski
| Format: | Article |
|---|---|
| Diterbitkan: | Pensoft Publishers 1989-12-01 |
Deskripsi
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.