Growth and reproduction of the greater weever (Trachinus draco L., 1758) along the eastern coast of the Black Sea

Orhan  Ak; Yasar  Genç

Makale detayları

Growth and reproduction of the greater weever (Trachinus draco L., 1758) along the eastern coast of the Black Sea

Yazarlar:

Orhan Ak | Yasar Genç

Yayıncı:

Türk Deniz Araştırmaları Vakfı

Dergi:

Journal of Black Sea / Mediterranean Environment 2013 Vol.19 Issue 1, pp.95-110

Belge Tipi:

Makale

Yayın Tarihi:

3/2013

Belge Dili:

İngilizce

Document ID (Org No.):

2000832537

Sıklık:

Üç Yıllık

pISSN:

1304-9550

Özet:

 

Abstract A total of 636 specimens of the greater weever, Trachinus draco, was collected monthly by bottom trawlers in the Eastern Black Sea. In order to identify some biological features of this species in the Black Sea, reproductive characteristics and growth parameters such as sex ratio, maturity stage, length at first maturity, spawning time, reproduction period, age, length-weight relationship, and condition factor were recorded. The female:male ratio was 1:1.04 (x2: 0.27, x20.05,1=3.84; P>0.05). Mean condition factors of females and males were 0.99055 and 0.95625, respectively. Taking into consideration of gonadosomatic index (GSI) and egg diameter, reproduction occurred in July and August. The age at first maturity was 1  year and the first reproduction length was 12.01 cm for females. The average diameter of mature egg was 0.91 ± 0.265 mm. Growth parameters of the von Bertalanffy equation were for females and males as follows: L∞ = 32.62 cm, K = 0.18 y-1, to = −1.74 year, and W∞ = 232.54 g, and L∞ = 29.31 cm, K = 0.17 y-1, to = −2.28 year, and W∞ = 232.54 g, respectively. The growth performance index (Ф) was 2.29, 2.17 and 2.36 for females, males and all specimens, respectively. The maximum age was 6  years for females and 5  years for males.

Makale detayları

Growth and reproduction of the greater weever (Trachinus draco L., 1758) along the eastern coast of the Black Sea

Yazarlar: Orhan Ak | Yasar Genç

Yayıncı: Türk Deniz Araştırmaları Vakfı

Dergi: Journal of Black Sea / Mediterranean Environment 2013 Vol.19 Issue 1, pp.95-110

Belge Tipi: Makale

Yayın Tarihi: 3/2013

Belge Dili: İngilizce

Document ID (Org No.): 2000832537

Sıklık: Üç Yıllık

pISSN: 1304-9550

Sayı

Yazarlar:

Orhan Ak | Yasar Genç

Yayıncı:

Türk Deniz Araştırmaları Vakfı

Dergi:

Journal of Black Sea / Mediterranean Environment 2013 Vol.19 Issue 1, pp.95-110

Belge Tipi:

Makale

Yayın Tarihi:

3/2013

Belge Dili:

İngilizce

Document ID (Org No.):

2000832537

Sıklık:

Üç Yıllık

pISSN:

1304-9550