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Life History of Mediterranean Horse Mackerel Trachurus mediterraneus (Carangidae) from Crimea (Black Sea)
Journal of Ichthyology ( IF 0.7 ) Pub Date : 2021-04-30 , DOI: 10.1134/s0032945221020107
D. N. Kutsyn

Abstract

The sex ratio, body length–age structure, growth rate, maturity dynamics, and mortality are studied in Mediterranean horse mackerel Trachurus mediterraneus from the shelf zone of Crimea. The sex ratio is close to 1 : 1, the maximum body length of the females and males is 22.5 and 20.8 cm, respectively, and the maximum age of the representatives of both sexes is 6 years. The sexual dimorphism in the growth rate is not revealed. The von Bertalanffy growth equation parameters for both sexes are as follows: asymptotic length and weight 19.0 cm and 57.4 g and growth coefficient 0.44 year–1. The females (50%) reach sexual maturity by 10.72 cm, and the males reach maturity by 10.53 cm at the age 1+. The spawning is observed from June to September. The maximum values of gonadosomatic indeces of the males (2.37%) and females (3.84%) are registered in June, and July, respectively. The coefficients of the total, natural, and fishing mortality are 1.41, 0.89, and 0.52 year–1. Within the entire range, the strong positive relationships between maximum body length, linear growth rate index and mean annual surface water temperature are registered. The difference in horse mackerel growth rate between various regions of the Black Sea is small. Nevertheless, the growth rate and maximum body length of the Black Sea individuals are smaller than these parameters in the Mediterranean Sea that is connected with the adaptation of the Black Sea population to climate seasonality.



中文翻译:

克里米亚(黑海)地中海竹荚鱼Trachurus mediterraneus(Carangidae)的生活史

摘要

研究了来自克里米亚架子区的地中海竹Trachurus mediterraneus的性别比,体长-年龄结构,生长速度,成熟度和死亡率。性别比接近1:1,男女的最大体长分别为22.5和20.8 cm,男女代表的最大年龄为6岁。没有显示出生长速度上的性二态性。男女两性的冯·贝塔兰菲生长方程参数如下:渐进长和体重19.0 cm和57.4 g,生长系数0.44 – 1年。女性(50%)在1岁以上达到了10.72 cm的性成熟度,而男性达到了10.53 cm的性成熟度。从六月到九月观察产卵。分别在6月和7月记录了男性(2.37%)和女性(3.84%)的性腺指数最大值。总的,自然的,捕捞死亡系数为1.41,0.89,0.52年-1。在整个范围内,最大体长,线性增长率指数和年平均地表水温之间存在很强的正相关关系。黑海各个地区之间的竹荚鱼生长率差异很小。然而,黑海个体的生长速度和最大体长小于地中海中与黑海人口适应气候季节有关的参数。

更新日期:2021-04-30
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