Karadeniz’de Vatoz Balığının, Raja clavata (Linnaeus, 1758) (Elasmobranchii: Rajidae) Üreme Zamanı ve Cinsi Olgunluk Boyu

Karadeniz’de vatoz balığının üreme zamanı, cinsi olgunluk boyu (Lm), üreme yükü (Lm/Lmax) ve yeni birey katılım başına maksimum ürün boyunu (Lopt) belirlemek ve bu parametreleri diğer popülasyonlarda yapılan çalışma sonuçlarıyla kıyaslama için Ocak 2011 ve Aralık 2013 arasında 18 ay örnekleme yapılmıştır. Toplam 265 birey (160 dişi, 105 erkek) incelenmiştir. Dişilerin ortalama toplam boyu erkeklerden istatistiksel olarak büyük hesaplanmıştır (p<0,05). GSI değerleri üreme aktivitesinin yıl boyu devam ettiğini göstermiştir. Lm dişiler için 75,44 cm, erkekler için 71,71 cm olarak hesaplanmıştır. Her ikicinsiyet için tespit edilen Lm değeri Lopt değerinden büyük bulunmuştur (Lm > Lopt).

Anahtar Kelimeler:

Hayat döngüsü, üreme biyolojisi, olgunlaşma, balıkçılık yönetimi

Spawning Period and Size at Maturity of the Thornback Ray, Raja clavata (Linnaeus, 1758), (Elasmobranchii: Rajidae) in the Black Sea

To describe the spawning period, size at maturity (Lm), reproductive load (Lm/Lmax), length at maximum yield per recruit (Lopt) of thornback ray (Raja clavata); and to assess the differences in these parameters from other populations, a total of 18 months samplings were conducted between February 2011 and December 2013 in the southeast Black Sea. A total of 265 (160 females and 105 males) specimens of thornback ray were examined. The mean total length (L) of females was significantly greater than the mean total length of males (p<0.05). The GSI analysis revealed that thornback ray showed reproductive activities throughout the year. The Lm was estimated as 75.44 cm for females and 71.71 cm for males. The Lopt was estimated from the empirical relationships between the Lopt and Lm, and it was larger than Lm for both sexes.

Keywords:

Reproduction biology, maturation, fisheries management, Life history,

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