Histological analysis of ovary development in narrow-clawed crayfish Astacus leptodactylus Esch. 1823 (Crustaceae, Decapoda, Astacidae), reared in ponds in South Bulgaria
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2009, Vol 2, Issue 3
Abstract
The study was carried out for determination the age and body weight in which the females of freshwater narrow-clawed crayfish Astacus leptodactylus Esch. reached maturity, as well as of the duration of the different stages of the annual reproduction cycles of the matured individuals in the conditions of carp ponds. The study was carried out on juvenile and matured female crayfish. As a result of the study it was found that female narrow-clawed crayfish reaches sexual maturity during the first year of its life (6-7 months old), at body weight above 9.5 g and body length above 7 cm. The annual ovarian cycle of sexually mature females in the region of South Bulgaria, is following: January-May - eggs incubation, resorption of unovulated oocytes in the ovary, presence of previtellogenic and early vitellogenic oocytes, endogenic vitellogenesis; June-November - exogenic vitellogenesis, active accumulation of vitellogenin into the oocytes from August till November; November-December - copulation, ovulation, fertilization of the eggs.
Authors and Affiliations
Tania Hubenova, Penka Vasileva, Angel Zaikov
Keywords
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