Reproductive Biology of Spiny Dogfish Squalus acanthias, in the North Aegean Sea

Year 2013, Volume: 13 Issue: 1, - , 01.02.2013

C. Cigdem Yigin Ali Ismen

https://doi.org/10.4194/1303-2712-v13_1_20

Abstract

A total number of 620 Squalus acanthias was sampled from the bottom trawl catches in the North Aegean Sea, Saros Bay from February 2005 to September 2008. The overall F/M ratio was 1.26:1. Females ranged from 17.1 cm to 117.5 cm in total length (TL) and males from 20.8 cm to 121.6 cm. Females showed positive allometric growth (b>3) while males indicated negative allometric growth (b<3). There were statistically significant differences in the relationship for total mass versus TL, and liver mass versus TL between males and females. The smallest sexually mature female was 54.5 cm in TL, while the smallest sexually mature male was 52 cm in TL. Mean length at 50% maturity was estimated at 56.4 cm for females and 52.8 cm for males. The diameter of the yolky oocytes ranged between 0.5 mm and 46 mm, while the mass ranged between 0.01 and 36.24 g. Hepatosomatic index (HSI) and gonadosomatic index (GSI) significanly increased with size in both males and females. While the ranges of HSI and GSI values for males ranged between 1.93-14.09% and 0.01-34.35%, those for females ranged between 1.63-17.17% and 0.01-96.50%, respectively. HSI reached the highest values in both sub-adult and adult specimens, reflecting the role of the liver in the gonadal production.

Keywords

Elasmobranchii, Saros Bay, maturity, reproductive cycle. Kuzey Ege Denizi’ndeki Mahmuzlu Camgöz (Squalus acanthias)’ün Üreme Biyolojisi

Reproductive Biology of Spiny Dogfish Squalus acanthias, in the North Aegean Sea

Abstract

Kuzey Ege Denizi, Saros Körfezi’nde, Şubat 2005-Eylül 2008 tarihleri arasında, dip trolü ile toplam 620 adet Squalus acanthias örneklenmiştir. Örneklerin tümünde cinsiyet oranları 1.26:1’dir. Dişilerin toplam boyları 17,1’den 117,5 cm’e, erkeklerin ise 20,8’den 121,6 cm’e değişim göstermiştir. Dişiler pozitif allometrik büyüme (b>3), erkekler negatif allometrik büyüme göstermiştir (b<3). Erkekler ve dişiler arasında, toplam boy-toplam ağırlık ve karaciğer ağırlığı-toplam boy ilişkileri istatistiksel olarak önemli derecede bulunmuştur. Cinsi olgunluğa erişen en küçük dişi 54,5 cm toplam boya sahipken, cinsi olgunluğa erişen en küçük erkek 52 cm toplam boydadır. Bireylerin %50’de ulaştığı ilk cinsi olgunluk boyu dişilerde 56,4 cm iken, erkeklerde 52,8 cm’dir. Oositlerin ağırlıkları 0,01 ile 36,24 g arasında değişim gösterirken, çapları 0,5 mm ve 46 mm arasında olduğu belirlenmiştir. Hepatosomatik indeks (HSI) ve gonadosomatik indeks (GSI) değerleri, hem dişi hem erkeklerin boyları ile önemli derecede artış göstermiştir. HSI ve GSI değerleri sırasıyla, erkeklerde 1,93-14,09% ve 0,0134,35% arasında değişirken, dişilerde 1,63-17,17% ve 0,01-96,50% arasında değişim göstermiştir. Karaciğerin üreme dönemine etkisinden dolayı, HSI değerleri hem yetişmekte olan hem de yetişkin bireylerde en yüksek değerine ulaşmıştır.

Keywords

Kıkırdaklı balıklar, Saros Körfezi, olgunluk, üreme zamanı.

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