第三千九百六十章 食人鱼的天敌
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就在众人看着吴雪莹紧张的样子大笑的时候,聚集在河边虎视眈眈盯着岸边的鱼群突然骚乱起来,无数条小鱼惊慌的向周围水中游去,水面上立即涌起了一片白色的涟漪。网址找回邮件:ltxsba@gmail.com众人赶紧凝神望去,一条细长的黑影突然从漆黑的河水中钻出,它细长的身子扭曲着向水中的鱼群冲来。
“哎呀,水蛇!”玲玲拉着吴雪莹惊叫着向后退了一步惊叫道。王教授凝神望去,他跟着说道:“这不是水蛇,这是电鳗,是这种食人鱼的天敌!”
话音中,水中密密麻麻的鱼群已经消失在周围漆黑的河水中,水面上飘荡着十几条已经翻着肚皮的食人鱼。水中那条细长的大鱼冷冷地望了一眼岸边的人群,它突然张开大嘴一口咬住飘在水面上的一条小鱼,跟着就迅速摇动尾巴向水中钻去,转眼时间已经消失在水中。
暗河中刚还密密麻麻的小鱼转眼之间已经不见了踪影,一圈圈正在扩大的水纹中漂浮着一片翻着肚皮的小鱼,吴雪莹惊愕的望着水面叫道:“王教授,这些食人鱼怎么瞬间就死了,这条长蛇般的大鱼怎么弄的?太厉害了!它怎么只吃了一条呀?”
王教授盯着翻上水面的那十几条小鱼回答道:“这条长蛇样的大鱼叫电鳗,是地球上最令人恐惧的淡水动物之一,它能在瞬间释放出一股强烈的电流,不但能将这种食人鱼电死,而且能将一个成年人当场电晕,产生的电压能达到伏,这种电鳗就是这些食人鱼群的天敌。它不是只吃一条,而是看到我们站在岸边受到了惊吓,一会儿它还会钻出来吃掉剩下的鱼。”话音中,水中突然“哗啦”响了一声,紧跟就看到另一条小鱼被迅速拽进了水中。
玲玲几人望着水中泛起的涟漪,玲玲惊愕的问道:“王教授,一条鱼怎么会产生这高的电压?”小雅、温梦和吴雪莹也都不解的向王教授望来。
王教授解释道:“电鳗之所以会放电,是因为它尾部有一个发电器,而这个发电器就来源于它的肌肉组织。这种鱼身体两侧的肌肉组织里有很多肌肉薄片,这些薄片就像一块块电池一样,电鳗的尾巴是正极,头是负极,它的身体就像无数个串联起来的‘电池’,所以电鳗能在瞬间产生很高的电压。”
玲玲听完摇摇头惊骇的说道:“这天下真是无奇不有,这要是在水中被这么高的电压电一下,就是不被电死也会溺水而亡,这种电鱼太吓人了!”
站在一旁的余静看到玲玲几人惊愕的样子,望着已经平静下来的水面说道:“这就是自然界的生态平衡。这种食人鱼十分凶残,如果让它们无限制的大量繁殖,水中的所有生物都会它们蚕食干净,所以电鳗这类食人鱼天敌的出现,正好可以控制它们的数量。”她跟着看着王教授说道:“王教授,你是研究生物的专家,您说是不是?”
王教授扭头看着余静点了点头说道:“对,这就是大自然中的生态平衡。余研究员,你在国外生活过很多年,对这种食人鱼应该很了解。我从相关资料中看到过,这类食人鱼的生存条件十分苛刻,它们只生活在大约二十摄氏度的水中,超出这个水温,它们的繁殖能力就会变得极弱,而且在它们所在水域中也伴生着电鳗这类天敌,所以我们在外面很少能看到这么大群的食人鱼。”
余静感叹道:“对,我在境外旅游的时候确实见到过这种食人鱼。说起来这就是物竞天择吧,物种之间及生物内部之间都存在着相互竞争,任何一个物种的无序发展都会破坏自然界的这种平衡,电鳗和自然条件抑制这种凶残鱼类的规模,这就是一种生态平衡的表现。”
她跟着看着万林说道:“豹头,眼前这条河水看着十分平静,可里面却是杀机四伏,大家行动的时候都要小心一点,一定要尽量远离河水!”
万林立即回答道:“好!”他跟着看着周围的队员大声说道:“大家都记住余总和王教授他们的叮嘱,尽量远离河水。”说着,他有些担心的抬头向前面漆黑的山洞望去,跟着喊道:“小花、小白。”
万林的喊声在寂静、幽深的山洞中响起了一片回声,前面漆黑的山洞中跟着就隐隐传来了小花和小白的吼声,整个山洞中都回荡着一阵阵“嗡嗡”的回音。
万林听到两只花豹发出的声音,脸上的神色立即平静了下来,他看着周围众人命令道:“大家都小心点,出发!”说完,他举着手电和风刀踩着岸边湿滑的岩石向山洞深处走去。小雅几人立即抓住余静的手臂跟了上去,大力和大壮也分别抓住了王教授和肖教授的手臂,搀扶着他们一同向前走去。
前面的山洞黑暗崎岖,岸边的凸起的一块块岩石十分湿滑,万林和风刀手扒着洞壁凸起的石块或者裂缝,一边缓缓向洞内深处行进、一边仔细观察着岸边。其他队员也都动作十分小心的跟在后面。
这里的河水距离两侧洞壁虽然有两三米的距离,可岸边的坡度陡峭,稍不注意就有可能在湿滑的岩石上失足,滑进旁边那片危险的河水中,所以大家的动作都变得小心,行进的速度也变得缓慢了下来。
众人一边小心翼翼的向前走去,一边举起手电向两侧黑漆漆的洞壁上照去,期盼着能着早些寻找到通往外面山间的裂缝或者山洞。
万林一群人满怀期望的连续向前行走了七八个小时,可漆黑的山洞中依旧没有发现通往外界的通道,一直在前面黑暗中的小花和小白也悄无声息。
这时,万林走到前面一块巨大的岩石旁停住脚步,他举起手电向远处漆黑的山洞中照去,山洞和反射着亮光的暗河在前面数百米处斜着向左侧拐去,前面洞壁上深深的裂缝和凸起的岩石,已经清晰地出现在手电光柱中。
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