北黄海细纹狮子鱼摄食生态的初步研究

Preliminary study on feeding ecology of Liparis tanakae in north Yellow Sea

根据2007年秋季在北黄海进行的定点底拖网调查,对细纹狮子鱼(Liparis tanakae)的摄食生态进行了初步研究。北黄海的细纹狮子鱼在秋季主要以虾类和底层鱼类为食,属于底栖动物食性鱼类,其优势饵料生物是脊腹褐虾(Crangon affinis)。在调查海域最北部的1号站位,细纹狮子鱼还摄食了较多的大泷六线鱼(Hexagrammos otakii)鱼卵。典范对应分析(CCA)表明,水深、经度、纬度和体长对细纹狮子鱼的食物组成有显著影响(P<0.05),而性别和性腺成熟度则没有显著影响(P>0.05)。脊腹褐虾体长与细纹狮子鱼体长之间呈显著的正相关(r=0.326,P<0.05),而中华安乐虾(Eualus sinensis)体长与细纹狮子鱼体长之间没有显著的相关关系(r=0.219,P>0.05);脊腹褐虾(r=-0.372,P<0.01)和中华安乐虾(r=-0.799,P<0.01)体长与细纹狮子鱼体长的比率与细纹狮子鱼体长之间均呈极显著的负相关关系。细纹狮子鱼的胃总质量和空胃质量均随着体长的增加呈指数增长。

Based upon survey data collected from north Yellow Sea during autumn in 2007,feeding ecology of Liparistanakae was investigated.The results showed that shrimps and demersal fishes were the most important preys of L.tanakae,which indicated that L.tanakae could be classified as a benthic carnivorous predator.At the species level,Crangonaffinis was the most important prey species.At one station in the north part of this investigating area,large amounts of eggs of Hexagrammosotakii were found in the stomachs of L.tanakae.The ordination technique of canonical correspondence analysis（CCA）was applied to study the association of available explanatory variables to the diet composition of L.tanakae.Depth,longitude,latitude and size were four important variables and significantly affected the diet composition of L.tanakae（P〈0.05）,whereas sex and gonad maturity stage had no significant impacts on diet composition（P〉0.05）.A strong positive relationship was found between the body lengths of Crangonaffinis and L.tanakae（r=0.326,P〈0.05）,whereas no significant correlation was found between the body lengths of Eualussinensis and L.tanakae（r=0.219,P〉0.05）.The length ratios between the two preys and L.tanakae both had significant positive relationship with the body length of L.tanakae（C.affinis：r=-0.372,P〈0.01;E.sinensis：r=-0.799,P〈0.01）.Regression analysis showed there were exponential relationship between stomach weight with contents,empty stomach weight and body length of L.tanakae.