Reproduction and Seasonal Growth Estimates of the Black Goby, Gobius niger (Osteichthyes: Perciformes: Gobiidae) in the Southeastern Black Sea Region of Turkey

Authors : Sabri BİLGİN, Hatice ONAY

Pages : 466-474

Doi:10.35229/jaes.764827

View : 57 | Download : 13

Publication Date : 2020-12-31

Article Type : Research Paper

Abstract :Seasonal growth pattern and reproductive biology of the black goby, Gobius niger, were studied in southern Black Sea between December 2012 and November 2013. The seasonal von Bertalanffy growth parameters, computed from ELEFAN, were estimated as L∞ = 11.90 cm TL, K = 0.701 year-1, C = 0.633, and WP = 0.492 for the Hoenig seasonal model and as L∞ = 12.14 cm TL, K = 0.680 year-1 for non-seasonal von Bertalanffy model. The size at sexual maturity insert ignore into journalissuearticles values(TL50); was estimated as 8.9 cm TL. The GSI ranged 0.60 in December and 8.57 in April insert ignore into journalissuearticles values(mean 3.82±0.818); for females and between 0.61 in October 2013 and 2.90 in May 2013 insert ignore into journalissuearticles values(mean 1.70±0.260); for males. The seasonal growth was pronounced probably due to reproduction activity which extended investment of energy in reproduction causing slower growth. The GSI development was related to photoperiod and the monthly variations of GSI values indicating that the intensive spawning occurred between April and August. During spawning time, the mean GSI value of females insert ignore into journalissuearticles values(6.04±1.177); was 2.9 times higher than the mean GSI values of males insert ignore into journalissuearticles values(2.08±0.423); insert ignore into journalissuearticles values(P < 0.05);. The results of this study were offered as biological input parameters regarded as a reference for the conservation and management of the Black Sea stocks of the black goby.
Keywords : Black goby, Gobius niger, reproduction, seasonal growth

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