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Macroscopical and Histological Analysis of Gonadal Development of Squalius cephalus (L., 1758) in Tödürge Lake, Turkey
B. Ünver* and S. Ünver Saraydın1
Cumhuriyet University, Department of Biology, 58140 Sivas, Turkey; 1Cumhuriyet University, Department of Histology-Embriology, 58140 Sivas, Turkey
*Corresponding author:


This study was carried out with the aim to analyze the gonadal development of S. cephalus in Tödürge Lake, Sivas, Turkey.  Anatomical and histological structures of gonads, oogenesis and spermatogenesis processes along with the determination of sexual maturity age of female (n=43) and male (n=27) individuals and spawning periods of the species were determined. Seasonal variations of gonads were illustrated. Five different oogenesis phases (chromatin nucleolar, perinucleolar, cortical alveolar, vitellogenic and maturation) and three different spermatogenesis phases (immature, maturing and mature testis) were identified. Results indicated that chub has a group syncrone type ovary, has a short reproduction season and spawn at once or twice times per year. Males reached to sexual maturity at II and III ages, and females reached to sexual maturity at III age. In addition, spawning period started at the end of May and went on through the end of June. Both oocyte and spermatocyte development and maturation were similar with the species belong to the subfamily Leuciscinae.

Key words: Chub, Gonad development, Oogenesis, Spermatogenesis


ISSN 0253-8318 (Print)
ISSN 2074-7764 (Online)