Reproductive Biology of the bobtail squid rossia macrosoma (Cephalopoda: sepiolidea) from the eastern Mediterranean

Bu çalışmada doğu Akdeniz’de Rossia macrosoma’nın yumurtlama stratejisi, yumurtlama verimliliği (PF) ve ilk olgunlaşma boyları incelenmiştir. İncelenen dişi bireylerin yumurta verimliliği 126-931 arasında iken erkek bireylerde spermatofor verimliliği ise 15-103 arasında tespit edilmiştir. Dişi bireylerdeki yumurta çapları 0,2-10,0 mm arasında, erkek bireylerin spermatofor boyları ise 12,3-18,8 mm arasında ölçülmüştür. Çalışmamızda incelenen bireylerin batı Akdeniz'deki akrabalarına göre daha erken boyda olgunlaştıkları ve bununla birlikte maksimum boyunda batıdaki bireylere göre daha küçük olduğu tespit edilmiştir. R. macrosoma’nın gonadlarındaki yumurta çaplarının dağılımına bakarak asenkronik ovaryum olgunlaşması olduğu tespit edilmiştir. Bu da R. macrosoma’nın diğer sepiolidler gibi aralıklı yumurtlayan bir tür olduğunu göstermektedir.

Anahtar Kelimeler:

Akdeniz, döllenme gücü, üreme

Doğu Akdeniz’de Rossia macrosoma’nın (Cephalopoda: sepiolidea) üreme biyolojisi

Rossia macrosoma was investigated based on material collected from the eastern Mediterranean Sea, to determine potential fecundity (PF), reproductive strategies and size at maturity. The female potential fecundity ranged between 126 and 931, while the value was 15 to 103 for male spermatophores. Egg sizes varied from 0.2 to 10.0 mm, and spermatophore lengths ranged from 12.3 to 18.8 mm. Animals became mature at smaller sizes than those from the western Mediterranean, thus, their maximum sizes were smaller either. According to egg diameter distributions in gonads, R. macrosoma has asynchronous ovary maturation, spawning more than once. Therefore, R. macrosoma is an intermittent spawner similar to other sepiolid species.

Keywords:

Mediterranean Sea, fecundity, reproduction,

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