中文摘要：

2009年5、8、10和12月,利用浅水Ⅰ型浮游生物水平和垂直拖网对葫芦岛海域鱼卵、仔稚鱼种类组成与数量分布进行了4个季度的调查。调查结果表明：4个季度共采到鱼卵44粒,仔稚鱼79尾,共鉴定出13个种,隶属于6目10科11属,其中有2种舌鳎类的鱼卵未能鉴定到种。优势种为赤鼻棱鳀（Thrissa kammalensis）、沙氏下鱵鱼（Hyporhamphus sajo-ri）、绯（Callionymus beniteguri）。春季垂直拖网采集到5粒鱼卵、8尾仔稚鱼。鱼卵、仔稚鱼的出现频率分别为25%和33.33%,平均密度分别为24.272和38.835ind/100m3;夏季水平和垂直拖网分别采集31粒鱼卵、47尾仔稚鱼和5粒鱼卵、24尾仔稚鱼,鱼卵、仔稚鱼的出现频率分别为100%、66.67%和20%、73.33%,平均密度分别为4.463、6.767ind/100m2和17.934、86.083ind/100m3;秋季和冬季都仅在水平拖网采到鱼卵,出现频率分别为10%和25%,密度分别为0.259和0.324ind/100m2。分析结果表明：随着季节的变化,暖水种、暖温种、冷温种间出现交替。春、秋、冬季鱼卵、仔稚鱼群落Margalef丰富度指数（D）、Shannon-Wiener多样性指数（H′）和Pielou均匀度指数（J′）平均值均较低,且各值均低于夏季,说明夏季种类结构相对其余3季稳定,多样性指数高、种类组成复杂、种间分布较均匀。本研究结果与该海域1998年同期（5、8月）调查结果在数量分布上有明显差异,鱼卵、仔稚鱼的种类组成与数量分布发生了显著变化。

英文摘要：

The species composition and distribution of ichthyoplankton surveys were carried out in the coastal waters of Huludao during May,August,October and December 2009.It was found that 44 eggs and 79 larvae of 13 taxa were collected during this period.Twelve taxa were taken as species,belonging to 11 genera,10 families,6 orders.Two sole fishes were only identified as family.The dominant species were Thrissa kammalensis,Hyporhamphus sajori and Callionymus beniteguri.In Spring,a total of 5 eggs and 8 larvae were captured.The occurrence frequencies of eggs and larvae were 25% and 33.33% in the horizontal tows.The average density were 24.272 and 38.835 ind/100m3 in the horizontal tows.In summer,a total of 36 eggs and 71 larvae were captured.In the vertical tows 31 eggs and 47 larvae were captured,and in the horizontal,5 eggs and 24 larvae were captured.The occurrence frequencies of eggs and larvae were 100% and 66.67% respectively in the vertical tows,20% and 73.33% in the horizontal tows.The average density of eggs and larvae were 4.463 and 6.767 ind/100m2 respectively in the vertical tows,17.934 and 86.083 ind/100m3 in the horizontal tows.In autumn and winter,2 eggs and 1 egg were captured only in the vertical tows.The occurrence frequencies of eggs were 10% and 25%,the average density of eggs were 0.259 ind/100m2 and 0.324 ind/100m2.Further analysis showed that four seasonal ecological groups could be distinguished and the warm-water species,warm-temperate species and the cold-temperate species appeared alternately in different seasons.The average community index（H′,D,J′） of the egg and larvae were low during the spring,autumn and winter,which were also lower than that in the summer.The result indicated that the community structure of ichthyoplankton was relatively stable;the diversity index of species and the uniformity of interspecific distribution in summer was relatively higher than any other seasons.The category composition and distribution patterns of ichthyoplankton in the Liaodong Bay Estuary changed ev