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The life history of rock gurnard (Trigloporus lastoviza , Brünn. 1768) in the Saronikos Gulf
Author(s) -
Papaconstantinou C.
Publication year - 1986
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/j.1439-0426.1986.tb00432.x
Subject(s) - biology , otolith , reproduction , fish measurement , fishery , sex ratio , fish <actinopterygii> , zoology , population , ecology , demography , sociology
Summary Age, growth and reproduction of rock gurnard in the Saronikos Gulf (Greece) were studied. Otoliths from 638 specimens (sex combined) were read for age determination. The body length‐otolith radius relationship was found linear (L = ‐18.0 + 4.99 x R; where L = fish length in mm, R = otolith radius 20 X). The life span of females seemed to be longer than that of males, indicating a differential mortality with sex. The growth was lower than that in the Catalane Sea. The maximum age of fish collected was VIII and the maximum fork length estimated by von B ertalanffy equation was 356 mm. Weight increased as the 3.054252 power or the length. Reproduction was observed to take place between winter and early spring and occasionally in early winter. Males began to mature after completion of the second year and the females after the third. The exploitation rate was rather high, which suggests that the rock gurnard stock was overfished in Saronikos Gulf. The male to female ratio was usually 1:1.