Some biological properties of Kura goby, Ponticola cyrius (Kessler, 1874) (Gobiiformes, Gobiidae) from Kura River, Turkey

Erdogan Cicek, Selda Öztürk, Sevil Sungur

Abstract

This work presents some biological properties, including length-frequency, length-weight relationships, Fulton’s condition factor, growth parameter, and growth performance and mortality indices of Kura goby, Ponticola cyrius. A total of 73 specimens were collected from the Çot Creek a tributary of Kura River, from May to September 2015. Age of P. cyrius varied from 0 to III age with age group I as the most frequent (56.16%). The total length and weight ranged 4.3-16.4 cm, and 1.10-50.10 g, respectively. The length-weight relationship was W=0.0145L2.9795 with b-value indicating isometric growth pattern. The estimated von Bertalanffy growth parameters are L¥ = 26.36 cm, k = 0.187 year-1 and to = -1.33 year. Growth performance index (Φ') and mean Fulton’s condition factor were estimated as 2.115 and 1.43, respectively. Instantaneous rate of total, natural and fishing mortalities were 0.588, 0.371 and 0.217 year-1, respectively and the exploitation rate was calculated as 0.369.

Keywords

Growth parameters, Ardahan, Çot Creek, Caspian Sea.

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