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首页> 外文期刊>Cybium >First information on biology of the needlefish Tylosurus acus imperialis (Belonidae) off the Tunisian coast (Central Mediterranean)
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First information on biology of the needlefish Tylosurus acus imperialis (Belonidae) off the Tunisian coast (Central Mediterranean)

机译:关于突尼斯海岸(地中海中部)的刺鱼Tylosurus acus imperialis(Belonidae)的生物学的第一个信息

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Sex ratio, age and growth, length and age at sexual maturity, and spawning season of the Mediterranean needlefish Tylosurus acus imperialis (Rafinesque, 1810) off Tunisian coast were investigated. A total of 126 individuals (54 females and 72 males) were sampled. The length weight relationships for females and males were W = 0.0027 L-2.832 (S.e.(a) +/- 0.004; s.e(.b) +/- 0.238) and W = 0.0026 L-2.827 (S.e.(a) +/- 0.002; s.e.(b) +/- 0.188), respectively. Otolith reading revealed that females belonged to age groups from 0 to 6 years and males from 2 to 4 years. Most of individuals were of age groups 3. The parameters of the von Bertalanffy growth function were L infinity=123.78 cm (s.e. +/- 17.93), k = 0.2 year(-1) (s.e. +/- 0.07) and t(0)= -2.28 year (s.e. +/- 0.57) for females and L infinity= 92.28 cm (s.e. +/- 5.93), k = 0.5 year(-1) (s.e. +/- 0.15) and t(0)= -1.16 year (s.e. +/- 0.45) for males. First sexual maturity was estimated at total length of 79.0 +/- 90.71 cm for females and 79.18 +/- 1.83 cm for males. Gonado-somatic index pattern indicated the spawning season extended from May to July.
机译:研究了突尼斯海岸外的地中海针鱼Tylosurus acus imperialis(Rafinesque,1810)的性别比,年龄和生长,性成熟时的长度和年龄以及产卵季节。总共采样了126个人(54位女性和72位男性)。女性和男性的长度重量关系为W = 0.0027 L-2.832(Se(a)+/- 0.004; se(.b)+/- 0.238)和W = 0.0026 L-2.827(Se(a)+/- 0.002; se(b)+/- 0.188)。耳石的读数显示,女性属于0至6岁的年龄段,男性属于2至4岁的年龄段。多数个体为3岁年龄段。von Bertalanffy生长函数的参数为​​L infinity = 123.78 cm(se +/- 17.93),k = 0.2 year(-1)(se +/- 0.07)和t(0 )= -2.28年(se +/- 0.57)(女性),L无限= 92.28 cm(se +/- 5.93),k = 0.5年(-1)(se +/- 0.15),t(0)=-男性1.16年(se +/- 0.45)。第一次性成熟的总长度估计为女性为79.0 +/- 90.71 cm,男性为79.18 +/- 1.83 cm。 Gonado体细胞指数模式表明产卵季节从5月延长到7月。

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