七鳃鳗，八目鳗一种七鳃鳗科的原始细长淡水或溯河产卵鱼，特点是长有无。
Any of various primitive elongated freshwater or anadromous fishes of the family Petromyzontidae, characteristically having a jawless sucking mouth with rasping teeth.
被捕获的鱼的平均重量也在减小，这正是研究机构大为担忧的，尽管产卵鱼的总存量从1985年以来已略微增加。
The mean weight of fish caught is also dropping, which worries the research institute greatly, though the biomass of spawning stock has increased slightly since 1985.
这种鱼一次产卵数千个。
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.
三文鱼设法游到上游产卵。
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.
建堤坝来阻断河流，既阻挡了回流产卵的鱼，又阻碍了下游淤泥肥沃土壤。
Blocking a river with a dam blocks the movement both of fish upstream to spawn and of silt downstream to fertilise fields.
从细小的卵开始， 翻车鱼再次进入“吉尼斯世界纪录”：它们是世界上产卵最多的脊椎动物。
They start as little eggs, and they're in "The Guinness World Book of Records" again for having the most number of eggs of any vertebrate on the planet.
另外中国也是世界上二氧化硫排放最多的国家，由此产生的酸雨正在侵蚀韩国和日本的森林面积，甚至日本渔民也受到了中国环境污染问题引起的影响：大型海蜇在漂游到日本北部之前会先在中国沿海产卵，这破坏了大麻哈鱼和黄鱼的捕捉，渔网和轮桨也因此受损。
The country is also the world's biggest emitter of sulphur dioxide. The resulting acid rain is damaging Korean and Japanese forests.
有些在水坝上活动的鱼被安上了无线电标签，可以追踪查看它们是否返回出生地产卵。
Some fish are radio-tagged, moved above a dam, and tracked to find out if they return to their birthplaces to spawn.
一些鱼在成熟之前是不产卵的：在些之前逮住它们，就不需要担心下一年鱼籽的产量。
Some fish do not spawn until maturity: catch them before that and you've no baby fish produced for the next year.
这个湖泊是欧亚大陆上最大的，红三文鱼的产卵场所。 也是野熊最爱呆的地方。
The lake is the largest spawning ground for red salmon in Eurasia and the best place for bears.
一个主要目的是保护产卵的鱼和幼鱼。
当鲱鱼前往产卵地时，这种20厘米长的鱼会很快聚集，并形成一个规模堪比曼哈顿区的鱼群。
As they headed for their spawning grounds, the 20m fish quickly came together in a school the size of Manhattan.
某些内行人常常喜欢喂养产卵型观赏鱼，像天使鱼、斑纹鱼、和霓虹脂鲤。
Some hobbyists often turn to egg-laying types like the angel-fish, the striped zebras, and the neons.
去年加利福尼亚和俄勒冈海域的大鳞大马哈鱼的绝迹也是如此，在产卵季节鱼群数量比2003年的峰值低88%。
So could the disappearance of Chinook salmon from the waters off California and Oregon last year; the population during the spawning season was 88% below its all-time high in 2003.
用于向库页岛南岬输送石油和天然气的两条管道将穿过1000多条河流和小溪，其中很多都是大马哈鱼的产卵地。
The twin pipelines that will deliver the oil and gas to the island's southern tip cross around 1,000 rivers and streams, many of which are used by spawning salmon.
Anchorage西南250英里(400公里)的McNeil河流域，形势尤其紧张，在那里，每年都有成百上千的游人慕名而来，看熊捕食产卵的大马哈鱼。
Tension is particularly high at the McNeil river, 250 miles (400km) south-west of Anchorage, where bears catching spawning salmon draw hundreds of visitors each year.
由原始的本能所驱动，大马哈鱼会奋力逆流而上在它们出生的同一个安静的水池内产卵。
Driven by primordial instinct, the salmon hurl themselves upstream to spawn in the same tranquil pools where they themselves were born.
鸟下蛋，鱼和昆虫产卵。
鱼，一些两栖类和原始的产卵的哺乳动物，如鸭嘴兽，使用类似的凹陷获得附近的动物产生的电场。
Fish, some amphibians and primitive egg-laying mammals such as the duck-billed platypus use similar pits to pick up electric fields generated by nearby animals.
内行人喜欢产卵型观赏鱼。
本地鱼的数量同样在降低，因为引诱它们来产卵的洪水变得更加不常见。
The number of indigenous fish was falling, since the floods that induce them to spawn were becoming rarer.
主要以昆虫为食。春季在浅水区产卵。由于溪流受到污染，使这种极佳的食用鱼数量减少。
They feed primarily on insects and spawn in shallow water in the spring. Pollution of streams has reduced the Numbers of this excellent food fish.
从海洋向上游到河流中，并在淡水中产卵的。用于指鱼。
Migrating up rivers from the sea to breed in fresh water. Used of fish.
某些内行人常常喜欢喂养产卵型观赏鱼，像天使鱼、斑纹鱼、和霓虹脂鲤。奇特的金鱼现在也被更多喂养。
Some hobbyists often turn to egg-laying types like the angel-fish, the striped zebras, and the neons. Fancy goldfish, too, are collected more now.
如果亲鱼成功产卵，我将进行更多的科学探讨。
If the fish spawned, then I would adopt a more scientific approach.
虽然作为淡水鱼类，三文鱼大部分时间都生活在海洋里，它们只在产卵期间回到淡水中，这种生活习性被称为溯河产卵。
Salmon spawn in fresh water, but in many cases, the fish spend most of their lives at sea, returning to the rivers only to reproduce. This lifecycle is described as anadromous.
虽然作为淡水鱼类，三文鱼大部分时间都生活在海洋里，它们只在产卵期间回到淡水中，这种生活习性被称为溯河产卵。
Salmon spawn in fresh water, but in many cases, the fish spend most of their lives at sea, returning to the rivers only to reproduce. This lifecycle is described as anadromous.
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