A PRELIMINARY HISTOLOGICAL STUDY ON OVARIUM DEVELOPMENT IN MIRROR CARP AND SCALED CARP (Cyprinus carpio L., 1758) INTRODUCED INTO GELINGÜLLÜ RESERVOIR, TURKEY

Yıl 2016, , 185 - 192, 29.07.2016

Belda Erkmen Şerife Gülsün Kırankaya

https://doi.org/10.3153/JAEFR16020

Öz

Carp
(Cyprinus carpio) is the most common species of the Cyprinidae family
and is among the important species commercially caught in the Gelingüllü
Reservoir, Yozgat, Turkey. In this study, the reproductive biology of mirror
carp and scaled carp in Gelingüllü Reservoir was studied in terms of the
gonadosomatic index (GSI), fecundity, and ovarian histology. Ovaries were
classified into 5 maturity stages based on histological data, as follows: 1.
Chromatin-nucleolus stage (oocyte diameter is 20-60 µm); 2. Peri-nucleolar
stage (oocyte diameter is 60-200 µm); 3. Cortical alveolar stage (oocyte
diameter is 200-600 µm); 4. Vitellogenic stage (oocyte diameter is 600-1000
µm); 5. Maturation stage (oocyte diameter is 1000-1400 µm). When ovulation was
completed, post-ovulatory follicles and atretic follicles were noted in the
ovaries. The spawning period in both populations extended from April to July,
but peak-spawning activity occurred in April and May. Absolute fecundity
reached 2.133 million eggs in mirror carp and 1.628 million eggs in scaled
carp. Ovaries that contained both yolk stage oocytes and postovulatory
follicles indicated that carp is a multiple spawner. Histological
analysis in the present study showed that female mirror carp and scaled carp
had mature eggs that contributed to sustaining the both populations in
Gelingüllü Reservoir.

Anahtar Kelimeler

Cyprinus carpio, Spawning season, Fe-cundity, Gonadal development, Gelin-güllü Reservoir, Introduced fish

Kaynakça

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