Histological assessment of seasonal gonad maturation of red mullet (Mullus barbatus L., 1758) in Antalya Bay of Mediterranean in Turkey
Balci, Beytullah Ahmet | Aktop, Yusuf
In this study, gonadal changes of red mullet (Mullus barbatus L., 1758) were investigated by histologically in Antalya Bay of Eastern Mediterranean in Turkey. A total of 890 specimens were collected monthly between May 2015 and October 2016 from fishing boats. The age of 890 red mullets was found to range from 0⁺ to VI⁺. Their gonads were dissected and fixed in 10% neutral buffered formaldehyde. They were embedded in paraffin blocks after histochemical processes. The sectioned tissue samples were stained with Haematoxylin-Eosin and Masson Trichrome. Two different stages in females and in males were observed according to gonadal development. Histologically, female individuals had in immature female (66 fish, 0⁺-IV⁺ ages), chromatin-nucleolus (67 fish, I⁺-VI⁺ ages), perinucleolus (63 fish, I⁺-IV⁺ ages), cortical alveoli (55 fish, I⁺-V⁺ ages), vitellogenesis (50 fish, I⁺-V⁺ ages), maturity (39 fish, I⁺-VI⁺ ages) and post-ovulation stages (59 fish, I⁺-VI⁺ ages). Male individuals had in spermatogenesis (96 fish, 0⁺-VI⁺ ages), spermiogenesis (97 fish, I⁺-IV⁺ ages), spermiation (85 fish, I⁺-VI⁺ ages), sperm release (84 fish, I⁺-VI⁺ ages) and resting stages (116 fish, I⁺-VI⁺ ages). Results show that the spawning season of M. barbatus is between May and September, and that egg diameters range from 31.00 ± 15 to 428.00 ± 40 µm.
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