Marine Biology Research ( IF 1.1 ) Pub Date : 2019-09-07 , DOI: 10.1080/17451000.2019.1662448 Sofía Ortega-García 1 , Alberto Abad-Uribarren 1 , Ulianov Jakes-Cota 1 , Nurenskaya Vélez-Arellano 2
Ovaries of bluefin tuna, Thunnus thynnus, from organisms measuring 247.62 ± 3.54 cm fork length collected within the Mexican Exclusive Economic Zone in the Gulf of Mexico, were examined. The highest gonadosomatic index was recorded in April (1.6 ± 0.28), coinciding with the presence of oocytes with a migratory nucleus (oocyte diameter 439 ± 32.84 µm); fully developed gonads were also observed in two females and two males (ovaries or testes, respectively) caught in late April when sea surface waters exceeded 26 °C. The microscopic examination of the gonads sampled showed structures that evidenced spawning in females measuring 280 cm FL.
中文翻译:
蓝鳍金枪鱼(Thunnus thynnus Linnaeus,1758)在墨西哥湾墨西哥专属经济区内水域产卵的组织学证据
检查了在墨西哥湾的墨西哥专属经济区内收集的叉长为247.62±3.54 cm的生物的蓝鳍金枪鱼(Thunnus thynnus)的卵巢。4月记录的最高性腺体指数(1.6±0.28),与卵母细胞带有移动核(卵母细胞直径439±32.84 µm)相符;4月下旬,当海表水温度超过26°C时,在两名雌性和两名雄性(分别为卵巢或睾丸)中也观察到了性腺的完全发育。显微镜检查的性腺样本显示出在280 cm FL的雌性中产卵的结构。