Age, growth and reproduction of four-spotted goby, Deltentosteus quadrimaculatus (Valenciennes, 1837), in İzmir Bay (central Aegean Sea)

Authors: GÜLNUR METİN, AKIN TÜRKER İLKYAZ, OZAN SOYKAN, HASAN TUNCAY KINACIGİL

Abstract: Length distribution, sex ratio, length-weight relationship, age, growth, spawning period, age, and length at first maturity of four-spotted goby inhabiting İzmir Bay were investigated. A total of 1696 four-spotted goby were collected by trawl hauls between July 2004 and June 2007. The size of the fish sampled ranged from 3.1 to 9.2 cm total length. The samples were composed of 31.1% females, 27.7% males, and 41.2% juvenile individuals, with a female to male ratio of 1:0.89. The age of the fish ranged from 1 to 5 years. The length-weight relationship and the von Bertalanffy growth function were estimated for all individuals as: W = 0.0036L^3.45 and L_t = 10.29[1 - e^{-0.371(t + 0.502)}]. Spawning period started in February and continued until May. The lengths at first maturity of females and males were 6.15 ± 0.18 and 6.38 ± 0.20 cm total length, respectively.

Keywords: Four-spotted goby, Deltentosteus quadrimaculatus, age, growth, reproduction, first maturity length, Aegean Sea

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