三文鱼设法游到上游产卵。
这种鱼一次产卵数千个。
大多数爬行动物通过在陆地产卵进行繁殖。
鱼群在前往上游产卵的途中被捕获。
Fishes are caught when they are on the way upstream to lay eggs.
它们在河床上挖巢产卵。
尽管生活在不同的水域，所有的鳗鱼都在海里产卵。
Despite living in different waters, all eels spawn in the sea.
这些有毒物质会限制毛毛虫的生长，减少雌蛾产卵的数量。
These noxious substances limit caterpillars' growth and reduce the number of eggs that female moths lay.
安吉利斯港的木材和造纸厂也封锁了通往上游产卵场的通道。
The lumber and paper mills in Port Angeles also block access to upstream spawning beds.
整个州都有生物学家在成年鱼出来产卵的时候持续监测着它们。
There are biologists throughout the state constantly monitoring adult fish as they show up to spawn.
它把叶子缝合成杯状，然后在杯子里面铺上一层稻草，在那里产卵。
It sews leaves together in the shape of a cup, then it adds a layer of straw to the inside of the cup and lays its eggs there.
没有人知道它们如何做到那么准确，或是鳗鱼为什么要在大海里产卵。
Nobody knows how they do it with such accuracy, or why eels spawn where they do.
这种光来自雌性萤火虫乌贼，它们在春天产卵，然后死亡，被冲到岸上。
The light comes from female firefly squids, which spawn in spring, then die and wash ashore.
清除淤泥，发现鱼类产卵的砾石层，找到合适的鲑鱼种类来重建种群是一项艰巨的任务。
Removing the mud, uncovering gravel beds where fish spawn, and finding suitable salmon types to rebuild the population is a daunting task.
有些鱼要到成熟期才产卵。如果你在成熟期之前就开始捕捞，那么你明年就没有鱼籽了。
Some fish do not spawn until maturity. If you catch them before that and you've no baby fish produced for the next year.
这些水坝阻断了6种鲑鱼的上游产卵地，而这条河曾是世界上鲑鱼产量最高的河流之一。
These dams blocked access to upstream spawning beds for six species of salmon on what once was one of the most productive salmon rivers in the world.
海龟产卵的狭长海滩一边受到开发的挤压，另一边受到海平面上升的威胁，因为海洋变暖。
The narrow strips of beach on which the turtles lay their eggs are being squeezed on one side by development and on the other by the threat of rising sea levels as the oceans warm.
然而，从某种程度上讲，海龟并没有像鲸鱼或儒艮一样完全回到水中生活，因为它们依旧在海滩上产卵。
However, they are, in one respect, less fully given back to the water than whales or dugongs, for turtles still lay their eggs on beaches.
有一种假说认为，这是一种自然现象；在特别适合产卵的那几年后，刺冠海星自然会经历种群数量的波动。
One hypothesis is that it's a natural phenomenon, that the starfish naturally undergo population fluctuations following particularly good spawning years.
因此，直到最近发现蜥脚类恐龙筑巢地的化石之前，科学家们还不能确定蜥脚类动物到底是产卵还是胎生。
Until the recent discovery of fossilized sauropod nesting grounds, scientists were thus uncertain whether sauropods laid eggs or gave birth to live young.
夏天，鳟鱼从Koocanusa湖逆流而上50英里，到不列颠哥伦比亚威格沃姆河的排水系统产卵。
In the summer, bull trout forge 50 miles upstream from Lake Koocanusa to spawn in the Wigwam River drainage in British Columbia.
这些大坝建于近一个世纪以前，是为洛杉矶港的木材和造纸厂提供电力的，大坝阻断了6种鲑鱼的上游产卵地。
Built nearly a century ago to provide power to lumber and paper mills in the town of Port Angeles, these dams blocked access to upstream spawning beds for six species of salmon.
可以预见的充足的鲑鱼数量让一些本土文化得以繁荣发展，濒死的产卵者喂养了熊、鹰和其他动物，并最终喂养了土壤本身。
The predictable abundance of salmon allowed some native cultures to flourish and dying spawners feed bears, eagles, other animals, and ultimately the soil itself.
鸭嘴兽（Ornithorhynchusanatinus）是仅有的两种卵生的哺乳动物之一，另一种为食蚁兽（spiny anteater），它产卵。
The platypus (Ornithorhynchus anatinus) is one of only two mammals, the other is the echidna (spiny anteater) that lays eggs.
证据只有产卵量大小和产卵的数量？
Based only on evidence of clutch volume size, the number of eggs?
它们途中产卵，然后死去。
雌蝴蝶在植物的叶片上产卵。
几周后，这只成年蝴蝶产卵，其生命循环又开始了。
After a few weeks, this adult butterfly lays her eggs, and the cycle begins all over again.
如果第二年有足够的雨水形成另一个湖泊，卵就会孵化，小虾会再次快速地经历生长、成年、产卵和死亡的循环。
If sufficient rain falls the next year to form another lake, the eggs hatch, and once again the shrimps pass rapidly through their cycle of growth, adulthood, egg-laying, and death.
正如我们讨论过的，鸟类显然是恐龙的后代，与一些恐龙物种有许多共同之处，比如羽毛，甚至飞行，当然还有产卵。
As we've discussed, birds are apparently descendants of dinosaurs and shared many commonalities with some dinosaur species, like feathers and maybe even flight and of course egg laid.
因为通常只有一只雌性在一个特定的幼虫中产卵，所以它只会产生一只雄性，因为这只雄性可以在孵化时使它所有的姐妹受精。
Since only one female usually lays eggs in a given larva, it would pay her to produce one male only, because this one male could fertilize all his sisters on emergence.
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