fish species composition

基本解釋

After 20 century 70s, fish species composition significant changed on the basis of the species composition of fish-scale-deposition.
通過魚鱗種類組成比例的改變，發(fā)現(xiàn)上世紀(jì)70年代後，魚類資源結(jié)搆發(fā)生了顯著的變化。
Fish species composition in seven Lakes of the Yunnan Plateau from 1990s to 2004 were compared to investigate variation and reasons for endangered native fishes.
根據(jù)七個(gè)雲(yún)南高原湖泊近年漁獲物的變化情況，探討了雲(yún)南土著魚類的變化特征和瀕危的原因。
According to the data selected from bottom trawl fishery resource monitoring in the East China Sea from 1997 to 2000, the species composition and seasonal variation of small-sized fish were analysed.
根據(jù)1997~2000年東海區(qū)底拖網(wǎng)漁業(yè)資源調(diào)查資料，分析和討論了東海區(qū)小型魚類的種類組成和季節(jié)變化。