底层鱼类

目前我国淡水水域的养殖对象大多为中、底层鱼类，仍主要采用传统渔具捕捞。

The culture species of freshwater fisheries in China are most midwater and demersal fishes caught by traditional fishing gears and drug .

渤海重要底层鱼类食物重叠系数与鱼类增殖

The dietary overlap coefficient and food resources of enhancement species among demersal fishes in Bohai Sea

近底层鱼类25种，占总数的18.25%；

The near demersal fish , with 25 species ( 18 . 25 % ) .

东海深海底层鱼类群落及其结构的研究

A study on the deep sea demersal fish communities and their structures in the East China Sea

全球金融危机及底层鱼类价格低迷，影响了罗非鱼市场。

Tilapia markets were influenced by the difficult economic situation and by low groundfish prices in all major markets .

黄、东海冬季底层鱼类群落结构及多样性变化

The change of structure and diversity of demersal fish communities in the Yellow Sea and East China Sea in winter

结果表明：渔获物以底层鱼类为主，但是中上层鱼类也占有一定的比例；

The results indicated that the demersal fish was the dominant species , but the pelagic fish possesses a definite proportion .

南海北部大陆架底层鱼类资源密度概率分布型的研究

The pattern of probability distribution on the density of demersal fishes stock in the northern continental shelf of the South China Sea

虽然底层鱼类仍然保持低价位运行，但是很多罗非鱼贸易商及生产商还是期望在2010年，罗非鱼价格能进一步上扬。

Traders and producers are expecting higher prices for2010 , although groundfish prices are forecast to stay at their present low levels .

中国团扇鳐分布于中国、朝鲜西南部和日本本州中部以南水域，为小型底层鱼类。

Platyrhina sinensis is a minitype fish that lives on the sea bottom of China , southwest of Korea , south of central Japan .

淡水蚌类是食物链上的重要环节和淡水生物群落的重要组成部分，可作为小型动物、底层鱼类和一些鸟类的食物。

Freshwater mussels which can be used as food for the small animals , groundfish and birds is an important part of the food chain and important component of the freshwater biomes .

根据1991年1～2月东、黄海冬季底层鱼类资源调查资料，分析了该海域的鱼类群落结构。本次调查共捕获鱼类4562.49kg，72935尾，198种。

Studies on the characteristics of fish communities structure and diversity are conducted , based on data from bottom trawl surveys during January ~ February 1991 in the East China Sea and the Yellow Sea .

这种网具能更好地开发利用近底层和中上层鱼类资源。

Using the new type trawl can better exploit and utilize the fish resource both on the sea bottom and in the middle and upper sea water layer .

中上层鱼类占16.0%，底层、近底层鱼类占84.0%。南海北部大陆架外海区底拖网鱼类资源现存量及可捕量的探讨

The pelagic species accounts for 16.0 % , while the demersal species amounts to 84.0 % . AN EXPLORATION OF THE STOCK AND POTENTIAL HARVEST OF DEMERSAL SPECIES IN THE SEA AREA OFF THE NORTHERN CONTINENTAL SHELF OF THE SOUTH CHINA SEA