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.