Scientia Marina, Vol 79, No 4 (2015)

Seasonal variation in reproductive activity and biochemical composition of flat oyster (Ostrea edulis) in the Homa Lagoon, Izmir Bay, Turkey

Sefa Acarli
Canakkale Onsekiz Mart University, Faculty of Marine Sciences and Technology , Turkey

Aynur Lök
Ege University, Fisheries Faculty, Department of Aquaculture , Turkey

Ali Kirtik
Ege University, Fisheries Faculty, Department of Aquaculture , Turkey

Deniz Acarli
Canakkale Onsekiz Mart University, Gökceada School of Applied Sciences, Department of Fisheries Technology , Turkey

Serpil Serdar
Ege University, Fisheries Faculty, Department of Aquaculture , Turkey

Aysun Kucukdermenci
Ege University, Fisheries Faculty, Department of Aquaculture , Turkey

Selcuk Yigitkurt
Ege University, Fisheries Faculty, Department of Aquaculture , Turkey

Harun Yildiz
Canakkale Onsekiz Mart University, Faculty of Marine Sciences and Technology , Turkey

Asiye Nur Saltan
Canakkale Onsekiz Mart University, Faculty of Marine Sciences and Technology , Turkey


The reproductive cycle of the flat oyster, Ostrea edulis Linnaeus, 1758, in Homa Lagoon, Izmir Bay, Turkey was examined from August 2008 to July 2009. Gonad samples were analysed histologically in order to determine the sex ratio and gonad development stage. Overall, the sex ratio was recorded as 2.2% female, 42.6% male, 37% hermaphrodite and 17.9% inactive. Glycogen content showed considerable variations between August and February, but decreased gradually thereafter. However, glycogen did not directly affect the reproductive cycle. Total lipid content was positively correlated with temperature and inversely correlated with salinity. In addition, this parameter was influenced by the reproductive activity, which is correlated with the fluctuation of the condition index and gonad index (P < 0.05). However, the relationship between the protein index and the gonad index was negative (P < 0.05). The results of this study showed that protein was the major energy resource. The condition index varied between 2.69±0.91 (February) and 12.29±1.45 (April) during the year. With respect to meat yield, oyster quality changed from “fine” to “special”, except in December and February.


flat oyster; Ostrea edulis; reproductive cycle; biochemical composition; Aegean Sea; Homa Lagoon

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