金枪鱼生活在海里,为何一生都要不停的游动?

2025-02-27 16:48:16
推荐回答(5个)
回答1:

看过电影《阿飞正传》的人都知道“有一种鸟没有脚,它一生都在飞翔,累了就睡在风中,它只落地一次,就是它死的时候。”那就是无足鸟,其实有一种鱼,也有着无足鸟一样的宿命。它一生不能停止游动,停止,便是死亡…它就是金枪鱼。今天带大家了解一下金枪鱼~

金枪鱼类属鲈形目鲭科又叫鲔鱼,华人世界又称为“吞拿(鱼)”。是大洋暖水性洄游鱼类,主要分布于低中纬度海区,在太平洋、大西洋、印度洋都有广泛的分布。同金枪鱼最相似的是鲣属鱼类,最简单的区分方法是鲣属腹部有4~6条黑色纵带,其它相近鱼种如舵鲣、狐鲣等有暗色纵带等。而金枪鱼类,鱼体无任何黑斑,或深色纵纹。

金枪鱼体呈纺锤形,具有鱼雷体形,其横断面略呈圆形。强劲的肌肉及新月形尾鳍,鳞以退化为小圆鳞,适于快速游泳,一般时速为每小时30~50公里,最高速可达每小时160公里,比陆地上跑得最快的动物还要快。金枪鱼若停止游泳就会窒息,原因是金枪鱼游泳时总是开着口,使水流经过鳃部而吸氧呼吸,所以在一生中它只能不停地持续高速游泳,即使在夜间也不休息,只是减缓了游速,降低了代谢。 

科学研究表明,大多数金枪鱼栖息在100~400米水深的海域,幼体的大眼金枪鱼和黄鳍金枪鱼以及鲣鱼都栖息在海洋的表层水域,一般不超过50米水深,而成体的大眼金枪鱼和黄鳍金枪鱼栖息水层比较深,大眼金枪鱼的栖息水层深于黄鳍金枪鱼。 

金枪鱼的温度会比周围水温高,它身体两侧有皮肤肌肉血管网丛,经科学家周密研究,金枪鱼的体温比周围水温高出9℃。这种不知疲倦的快速游泳者,肌肉收缩力量是使它们体温升高的主要原因。沿金枪鱼脊柱两侧强有力的肌肉和皮肤上大量的血管网丛,表明这些部分的新陈代谢特别旺盛,因而金枪鱼的鱼肉似牛肉,是紫红色的。其中血红索含量很高,低脂而高强蛋白,所以营养价值高。 

金枪鱼和旗鱼同属大洋洄游性“候鱼”,每年的初夏、秋末,它们举家合群都要作上万里程的北上南归的生殖、索饵洄游。冬春季,它们聚集于大西洋、印度洋和太平洋赤道线附近的多珊瑚礁深水域,待到来年夏季到赤时,那些“身怀六甲”的亲鱼,便迫不及待地纷纷远涉重洋,奔赴它们各自的出生地去产卵生子、哺育儿女、休息生息,直至秋后,再举南迁。

希望这篇文章能让更多的人了解金枪鱼! 

回答2:

鱼若停止游泳就会窒息。金枪鱼的鳃肌已退化,总是开着口,不停地游动,借由新鲜的水流流过鳃部获取氧气。金枪鱼若停止游动,就会因缺氧窒息死亡。

回答3:

因为金枪鱼身体内有很多有毒的物质,所以必须要依靠不停的游动来摆脱这些物质。

回答4:

金枪鱼只有不停游动才可以不断的进食,维持身体的的能量消耗,满足身体的正常需求。

回答5:

因为它的鳃肌退化了,如果停止游动就获取不了氧气,就会死亡。

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