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Population parameters of stargazer ( U ranoscopus scaber L innaeus, 1758) in the southeastern B lack S ea region during the 2011–2012 fishing season
Author(s) -
Erdoğan Sağlam N.,
Sağlam C.
Publication year - 2013
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.12305
Subject(s) - biology , fishing , fishery , population , zoology , demography , sociology
Summary The population parameters of stargazer ( U ranoscopus scaber L innaeus, 1758) were studied regarding age composition, sex ratio, growth, survival and mortality rates, and the exploitation rate in the southeastern B lack S ea near the coast of Turkey during the 2011–2012 fishing season. According to ageing analysis of the samples, age group 1 is the most abundant (47.76%), followed by age 2 (41.04%), age 3 (9.33%), age 0 (1.12%) and age 4 (0.75%). Mean totals as well as total lengths and weights for males and females were 14.5 ± 0.22 cm and 12.9 ± 0.19 g, 16.6 ± 0.24 cm and 62.1 ± 2.76 g, and 37.2 ± 1.92 cm and 87.1 ± 3.88 g, respectively. The mean condition factor was K = 0.0167, while the sex ratio was 53.98% female, 38.75% male and 7.27% immature. Length‐weight, age‐length and age‐weight equations were W = 0.014 × L 3.059 , L ( t ) =44.5*[1−e −0.148*( t +1.242) ] and W ( t ) =1544.4*[1−e −0.148*( t + 1.242) ] 3.059 , respectively. The computed survival rate (S), instantaneous total mortality rate (Z), annual mortality rate (A), natural mortality rate (M) and fishing mortality rate (F) were S = 28.94%, Z = 1.24 year −1 , A = 71.06%, M = 0.26 year −1 and F = 0.98 year −1 , respectively. The exploitation rate was 0.79, which is above the optimum exploitation levels.