Manchester is a spawning ground for cutting - edge music 曼徹斯特是前沿音樂(lè)的發(fā)祥地。
Spawning ground of nemipterus bathybius in northern continental shelf waters of south china sea 南海北部陸架區(qū)海域深水金線魚(yú)的產(chǎn)卵場(chǎng)
The reasons of small resource are 1st , the fish eggs is lack of sticky and most spawning ground is not comfortable for spawning ; 2nd , the fish matures about 5 years old and fecundity is in low level on absolute or relative eggs amount ; 3rd , the shape is easier for catching with tall width and thin body 黑龍江魴資源量少的原因?yàn)椋汉邶埥櫈楫a(chǎn)弱黏性卵的魚(yú)類,對(duì)產(chǎn)卵場(chǎng)的要求較高。黑龍江魴的性成熟年齡較大( 5齡) ,而且無(wú)論是絕對(duì)懷卵量還是相對(duì)懷卵量都較低,因此生殖力較低。黑龍江魴由于體形高而側(cè)扁,極易被捕撈。
In this paper , zooplankton communities , their species composition and indicator species in the east china sea and the yellow sea were examined with multivariate methods . in the southern part of the yellow sea , where was known as an important spawning ground of anchovy , the seasonal variations of zooplankton were studied in details with respect to species composition , abundance , biomass and vertical distribution . furthermore zooplankton indication of the yellow sea warm current ( yswc ) in winter was discussed 本論文用數(shù)理統(tǒng)計(jì)方法(包括:雙向指示種分析、多維定標(biāo)序列分析、判別分析和多元回歸分析)對(duì)春、秋兩季東、黃海浮游動(dòng)物群落進(jìn)行了劃分、確定各群落的指示種;對(duì)南黃海浮游動(dòng)物的種類組成、分布及其時(shí)空變化進(jìn)行了研究,并與歷史資料進(jìn)行了比較;并探討了黃海冷水團(tuán)對(duì)某些浮游動(dòng)物的意義,以及浮游動(dòng)物對(duì)黃海暖流指示。