Abstract This study determines the length distribution, length– weight relationship, age, growth parameters, mortality rate, sex ratios, length at first maturity and reproduction of saddled seabream (Oblada melanura) collected monthly by fishermen around the Northern Aegean Sea between November 2017 and October 2018. The length–weight relationship was calculated as W=0.0091×L3.11 (R2=0.95) and positive allometric growth was found. The condition factor and GSI varied between 0.81–1.58 and 0.01–9.61, respectively. The spawning season extended from May to July and peaked in June. Total lengths at 50% maturity were 18.97 cm for males and 18.83 cm for females. Parameters of the von Bertalanffy growth equation were: L∞ =29.91 cm, K =0.27 per year, t0 =−0.82 year and age varied between 1 and 8. The instantaneous rates of total mortality (Z) and natural mortality (M) were 1.36 and 0.58 per year, respectively. Rates for fishing mortality F and exploitation E were 0.78 and 0.57 per year, respectively. The mean absolute fecundity (F) was 117 075±23 243 oocytes, ranging from 19130 to 470 132.

中文翻译：

---

东地中海北爱琴海马鞍鲷 (Oblada melanura) 的年龄、生长和繁殖生物学

摘要 本研究确定了 2017 年 11 月至 2017 年 11 月至 2017 年 11 月至2018 年 10 月。长度-体重关系计算为 W=0.0091×L3.11 (R2=0.95)，发现正异速生长。条件因子和 GSI 分别在 0.81-1.58 和 0.01-9.61 之间变化。产卵期从 5 月延长至 7 月，并在 6 月达到高峰。50% 成熟度时，雄性的总长度为 18.97 厘米，雌性的总长度为 18.83 厘米。von Bertalanffy 生长方程的参数为：L∞ =29.91 cm，K =0.27 每年，t0 =-0.82 岁，年龄在 1 到 8 岁之间变化。总死亡率 (Z) 和自然死亡率 (M) 的瞬时率分别为每年 1.36 和 0.58。捕捞死亡率 F 和开发 E 的比率分别为每年 0.78 和 0.57。平均绝对繁殖力 (F) 为 117 075±23 243 个卵母细胞，范围从 19130 到 470 132。