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

Yıl 2020, , 525 - 534, 01.12.2020

Sabri Bilgin , Hatice Onay

https://doi.org/10.22392/actaquatr.735868

Cited By: 1

Öz

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.

Anahtar Kelimeler

Reproduction biology, maturation, fisheries management, Life history

Destekleyen Kurum

Recep Tayyip Erdoğan University

Proje Numarası

2013.103.03.1 and 2010.103.02.

Teşekkür

We thank Sami Akmermer, Kazım Akmermer, Uğur Akmermer and Ahmet Kalkavan for their help during the field studies. We would like to thank two anonymous reviewers for their helpful comments. This study was supported by Recep Tayyip Erdoğan University with the project numbers 2013.103.03.1 and 2010.103.02.

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

Öz

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

Proje Numarası

2013.103.03.1 and 2010.103.02.

Kaynakça

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