Growth Characteristics of Long-Nosed Skate <i>Dipturus oxyrinchus</i> (Linnaeus, 1758) Inhabiting the Northeastern Mediterranean Sea
Nuri Başusta | Fatih Volkan Ozel
This study aims to determine the age and growth characteristics of <i>Dipturus oxyrinchus</i> 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 12.2–93.5 cm and weight of 8.34–3828 g were collected as non-target species from a commercial fishing boat. The male−female ratio was determined as 1:1.27. Using the von Bertalanffy equation and the Gompertz or logistic growth models, the growth parameters of <i>Dipturus oxyrinchus</i> were estimated as L∞ = 154.0, K = 0.064, t<sub>0</sub> = −1.622; L∞ = 104.0, K = 0.35, <i>I</i> = 4.99; L∞ = 128.40, K = 0.19, <i>I</i> = 4.39 for all individuals, respectively. Maximum absolute growth was calculated as 9.33 cm at 5–6 years of age. Maximum relative growth at 1–2 years of age was estimated as 36.39%. Both absolute and relative growth were minimal in the 11–12 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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