The biological characteristics of eels from the Asi River, Turkey, were assessed between December 2017 and November 2018. Eels were sampled monthly using fyke nets (operated by professional fishermen), yielding a total of 509 specimens. Total length and weight were measured, sex, age and maturity stages (silver or yellow eel) were determined. Catch Per Unit Effort (CPUE) was calculated for both biomass per unit effort and numbers caught on a monthly and annual basis. The length‐weight relationships (LWRs) of silver and yellow eel was W = 0.009*TL^3.22 (n = 262) and W = 0.0106*L^3.09 (n = 247), respectively. The age of the sampled fish ranged from year class II to VI. Von Bertalanffy growth parameters were estimated as L_∞=69.25 cm, K = 0.43 1/year, t₀= −0.41 and phi prime index (ǿ)= 3.31 for all samples. The overall eel fishing mortality rate (F) was 0.31 year^‐1, and the exploitation and survival rates of silver stage eels were estimated with 30% and 39%, respectively.

中文翻译：

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来自土耳其东北地中海地区阿西河的欧洲鳗鱼的生物参数和现况（Anguilla anguilla Linnaeus，1758）

在2017年12月至2018年11月之间评估了土耳其阿西河的鳗鱼的生物学特性。使用fyke网（由专业渔民操作）每月对鳗鱼进行采样，共获得509个标本。测量总长度和体重，确定性别，年龄和成熟阶段（银鳗或黄鳗鱼）。计算每单位工作量的生物量以及每月和每年捕获的数量的单位工作量捕获量（CPUE）。银鳗和黄鳗鱼的长度与体重的关系分别为W = 0.009 * TL ^3.22（n  = 262）和W = 0.0106 * L ^3.09（n  = 247）。采样鱼的年龄范围为II级到VI级。冯·贝塔兰菲的生长参数估计为_L∞对于所有样品，其＝69.25cm，K ＝ 0.43 1 /年，t ₀＝ -0.41，并且phi初始指数（（）＝ 3.31。鳗鱼捕捞的总死亡率（F）为0.31年- ^1年，据估计，白stage鳗的开发和存活率分别为30％和39％。