TY  - JOUR
T1  - Growth and reproduction of the greater weever (Trachinus draco L., 1758) along the eastern coast of the Black Sea
AU  - Ak, Orhan 
AU  - Genç, Yasar 
PY  - 2013
DA  - April
JF  - Journal of Black Sea / Mediterranean Environment
PB  - Türk Deniz Araştırmaları Vakfı
WT  - DergiPark
SN  - 1304-9550
SP  - 95
EP  - 110
VL  - 19
IS  - 1
LA  - en
AB  - 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.
KW  - Key words: Greater weever
KW  - Trachinus draco
KW  - first maturity length
KW  - growth parameters
KW  - gonadosomatic index
KW  - Black Sea
CR  - Abdallah, M. (2002) Length-weight relationship of fishes caught by trawl off
CR  - Alexandria, Egypt. Naga ICLARM Q. 25 (1): 19-20. Ak, O. (2009) Fish egg and larvae distribution with egg production and distribution of economic demersal fishes whiting (Merlangius merlangus euxinus Nordmann, 1840) and red mullet (Mullus barbatus ponticus, Ess. 1927) in Trabzon coast. Ph.D. Thesis. Ataturk University, Department of Aquaculture,
CR  - Erzurum, 151 pp. (in Turkish). Ak, O., Kutlu S., Aydın, İ. (2009) Length-weight relationship of fishes caught
UR  - https://dergipark.org.tr/en/pub/jbme/article/121768
L1  - https://dergipark.org.tr/en/download/article-file/103626
ER  -