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fish species

网络鱼种；鱼类种类；品种

fish species

fish species

fish species

鱼种

LONGSHENG AQUATIC PRODUCTS GROUPS ... WHITENESS 白度 FISH SPECIES 鱼种 GRADE 级别 ...

鱼类种类

鱼类,fish,音标,读音,翻译,英文例句,英... ... ) fish feeder 食鱼鱼类 ) fish species 鱼类种类 ) carangiform fish 鱼参科鱼类 ...

品种

2002年第8期水产品价格报告─中国国内淡水鱼类... ... 鲮鱼 DACE 品种 FISH SPECIES 产品形式、规格 PRODUCT ...

2

each fish species has a preferred water layer where it spends most of its time : near the surface , in the middle , or near the bottom .

每一种鱼都有偏好的水层，它们大部分时间都会呆在那儿：接近水面的上层水区、中层水区、或是接近水底的底层水区。

5

minimum size Legislated size below which individuals of some fish species are not to be retained after being caught .

最小大小制定法律在一定大小下一些鱼种的个体在被捕捉之后不能被保有的。

6

Lack of sediment has meant that local fish species have become extinct and the Grand Canyon 's beaches have been severely eroded .

泥沙的流失意味着本地鱼类物种灭绝和大峡谷河滩受到严重侵蚀。

7

The Danube delta hosts over300 species of birds as well as45 freshwater fish species in its numerous lakes and marshes .

多瑙河三角洲不计其数的湖泊和沼泽哺育着 300 多种鸟类和 45 种多瑙河及其支流中特有的鱼类。

10

The nematode 's mean prevalence, prevalence, mean abundance and intensity of infection varied in different fish species.

不同宿主中，杜父鱼驼形线虫的感染率、感染丰度和感染强度差异很大。

11

It thrived despite the introduction of different fish species as well as alien floating plants .

无论外来鱼种还是植物的引进，它都生机勃勃。

14

Overfishing , which depletes populations of commercial fish species .

捕捞过度，耗尽商业鱼品种的群集。

15

Which of following , if true, most help to explain the decline in the population of the fish species?

下列哪个选项如果是对的，最有效地解释了鱼的数量下降？

16

As is the way of evolution , however , some fish species have developed resistance to PCB poisoning.

然而，某些鱼种已经产生 PCB 抵抗，这就是进化。

18

19

Zebra mussels are not often eaten by native fish species so they represent a dead end ecologically .

斑马贻贝较少被当地鱼类吃掉，所以，它们就在生态上充当了一种终结者。

20

Indeed , over three-quarters of all marine fish species are below , or on the brink of falling below, sustainable levels .

的确，超过四分之三的海洋鱼种数量正降到可承受的水平边缘或之下。

22

It warns of the possible collapse of fish species important to the commercial food supply .

报告警告说，对鱼类可能崩溃重要的商业食品供应。

23

The number of fish species in Poyang Lake has already fallen by half .

鄱阳湖鱼的种类已经减少了一半。

24

The river has more than 100 other fish species , but their combined activity failed to compensate for the loss of the flannelmouth.

这条河拥有超过 100 种其它的鱼类，但是它们活动的总和无法补偿这种鱼的消失。

25

But the population plunged in the smallest fish species , the fathead minnow .

然而最小的鱼种，黑头呆鱼的数量却发生了变化。

26

There are significant monthly differences of catch quantity and also of fish species composition.

在各个鱼种的消长也有著显著的季节及海域的变化。

30

The reserve is home to 180 different fish species , including the already endangered Chinese sturgeon and the finless porpoise .

这个保护区是 180 种鱼类的栖息地，其中包括已经濒危的中华鳕和江豚。

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