Reproductive Biology of the Elegant Cuttlefish (Sepia elegans) in the Eastern Mediterranean

Bu çalışmada S.elegans'a ait toplam 924 birey (432 erkek; 492 dişi) Ege Denizi'nden Mayıs 2008' den Nisan 2009 tarihleri arasında aylık olarak örneklenmiştir. Laboratuvara getirilen örneklerin manto boyları ölçülmüş, ağırlıkları tartılmış ve daha sonra üreme sistemleri çıkarılarak olgunluk safhaları belirlenmiş ve tartılmıştır. Elde edilen bireylerden populasyonun olgunlaşma boyları (ML50) erkekler için 42 mm ML, dişiler için ise 41 mm ML olarak tespit edilmiştir. Mevsimsel gonasdosomatik indis değerlerinden bölgedeki populasyona ait bireylerin Temmuz ve Ekim ayları olmak üzere iki üreme piki oluşturdukları gözlenmiştir. Gonadlardaki yumurta ovulasyonunun ise asinkronik yapıda olduğu ve buna bağlı olarak yumurtlamanın sürekli olduğu tespit edilmiştir. Her iki cinsiyetteki bireylerin doğurganlıkları dişi bireylerde 513-1190 yumurta rasında iken erkek bireylerin ise 167-486 spermatofor arasında olduğu hesaplanmıştır. Ege Denizi'nde tespit edilen bireylerin manto boyları doğu Akdeniz'deki bireylerden daha küçük olduğu ve bunun başlıca sebebinin ise primer productivitenin batı Akdeniz'den daha az ve suların ise daha sıcak olmasından kaynaklandığından ileri gelebileceği düşünülmektedir

Doğu Akdeniz'de Küçük Mürekkep Balığının (Sepia elegans) Üreme Biyolojisi

Reproductive biology of Mediterranean cuttlefish Sepia elegans has been studied in the Aegean Sea from total of 924 animals (432 males, 492 females) caught during monthly trawl surveys from May 2008 to April 2009. Cuttlefishes were measured, weighed, maturity assessed, and reproductive systems were removed and investigated in the lab. The size at maturity (ML50) were 42 mm (males) ML and 41mm ML (females) respectively. Seasonal changes in a gonadosomatic index suggest extended reproductive period of the population with two peaks of spawning; once in July and in October. The ovulation pattern of S. elegans is asynchronous and spawning occurs continuously. The female potential fecundity was 5131190. The spermatophore counts for mature males ranged 167-486. Size of adult individuals in the East Mediterranean was smaller than that in the Western Mediterranean probably due to lower productivity and high temperatures (hence expenses on metabolism)

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