Growth Characteristics of Long-Nosed Skate Dipturus oxyrinchus (Linnaeus, 1758) Inhabiting the Northeastern Mediterranean Sea
2022
Nuri Başusta | Fatih Volkan Ozel
This study aims to determine the age and growth characteristics of Dipturus oxyrinchus living in the Northeastern Mediterranean Sea and to present data that can provide a comparison with previous studies on the same subject. A total of 255 long-nose skates at a total length of 12.2&ndash:93.5 cm and weight of 8.34&ndash:3828 g were collected as non-target species from a commercial fishing boat. The male&minus:female ratio was determined as 1:1.27. Using the von Bertalanffy equation and the Gompertz or logistic growth models, the growth parameters of Dipturus oxyrinchus were estimated as L&infin: = 154.0, K = 0.064, t0 = &minus:1.622: L&infin: = 104.0, K = 0.35, I = 4.99: L&infin: = 128.40, K = 0.19, I = 4.39 for all individuals, respectively. Maximum absolute growth was calculated as 9.33 cm at 5&ndash:6 years of age. Maximum relative growth at 1&ndash:2 years of age was estimated as 36.39%. Both absolute and relative growth were minimal in the 11&ndash:12 age group. The highest condition factor value was estimated as 0.416 in the 8-year-old group. As a result, the growth data of long-nose skates were obtained for the first time in the Northeastern Mediterranean Sea.
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