Estimation of Growth and Mortality Parameters for the Annular Seabream Diplodus annularis (Linnaeus, 1978) in the Southern Aegean Sea
2024
Ali Uyan
The growth and mortality parameters were examined for the annular seabream Diplodus annularis collected from the Didim coast, Southern Aegean Sea. A total of 654 annular seabream individuals, 263 female (40.21%) and 391 male (59.79%), were sampled by commercial trawlers and gillnets from September 2022 to January 2024. The total length varied between 9.0 and 24.3 cm for females, 8.6 and 24.0 cm for males, and the weight varied between 8.60 and 146.57 g for females, 7.00 and 128.96 g for males. The length-weight relationships were calculated for females, males, and all individuals as W = 0.0115 x L2.9641, W = 0.0131 x L2.8995, and W = 0.0118 x L2.9440, respectively. The growth pattern was determined as negative allometric. The maximum age class was V for both females and males. The von Bertalanffy growth parameters were L∞ = 25.27 cm, k = 0.424 year-1, t0 = -0.308 years for females; L∞ = 25.63 cm, k = 0.338 year-1, t0 = -0.935 years for males; L∞ = 27.43 cm, k = 0.283 year-1, t0 = -1.121 years for all individuals. The growth performance index (Φ´) for females, males, and all individuals were 2.432, 2.347, and 2.329, respectively. This study provides the first information on the growth and mortality parameters of D. annularis along the Didim coast, southern Aegean Sea.
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