资源描述：
《第10卷第4期上海水产大学学报vol》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、第10卷第4期上海水产大学学报Vol.10,No.42001年12月JOURNALOFSHANGHAIFISHERIESUNIVERSITYDec.,2001文章编号:1004-7271(2001)04-0307-06赤点石斑鱼仔稚幼鱼的形态发育和生长王涵生,方琼珊,郑乐云(福建省水产研究所海水养殖研究室,福建厦门 361012)摘 要:通过赤点石斑鱼各个发育期的仔稚幼鱼连续取样,系统地观察了仔稚幼鱼各个发育期的形态变化及生长特征,并进行描图。赤点石斑鱼初孵仔鱼全长1.35～1.45mm。稚鱼第6～7d长出特别伸
2、长的背鳍第2鳍棘和腹鳍棘,其长度与全长之比在第16～18d、全长11mm左右时达到最大值,接近50%。这一形态特点是石斑鱼属仔稚鱼期特有的。以后随着个体的生长和其他鳍棘的伸长,这一比例逐渐减小,直至小于其他鳍棘,这是稚鱼完成变态成为苗种的重要标志。最早完成变态的稚鱼须在孵化后第35d,全长30mm以上,但到第45d时,全长24mm的个体也可以完成变态。即使在相同的环境条件下,仔稚幼鱼的个体大小差异也很大,且越到后期差异越大。关键词:赤点石斑鱼;仔鱼;稚鱼;幼鱼;形态发育;生长中图分类号:S965.334文献标识码
3、:AMorphologicaldevelopmentandgrowthofthelarvae,juvenilesandyoungfishofEpinephelusakaaraWANGHan2sheng,FANGQiong2shan,ZHENGLe2yun(TheMaricultureDepartmentoftheFujianFisheriesResearchInstitute,Xiamen361012,China)Abstract:Thenewlyhatchinglarvae,juveniles,youngfis
4、hofEpinephelusakaaraweresampledevery325daysalongwithgrowthofthefishtotranceandobservethecharacteristicsandgrowth.Thenewlyhatchinglarvaewere1.3521.45mminT.L.andmightbethesmallestoneofthenewlyhatchinglarvaeofthemarinefishwhichartificialpropagationhadbeencarried
5、out.Themostcharacteristicfeatureofthefish(andallspeciesbelongingtothegenusEpinephelus)wasextraordinaryprolongationofdorsalsecondandventralspinesappearingwhenthelarvaewere728daysoldandabout425mminT.L.TheratioofthesespinestoT.L.attainitsmaximum(about0.5)whenthe
6、fishwere16218daysoldand11mminT.L.Thereaftertheratiodecreasedalongwithgrowthoffishandelongationofotherspinestillthedorsalsecondandventralspineswereshorterthanotherspinesandthiswastheimportantsymbolmoanedmetamorphosiswascompleted.Theearliestcompletingofmetamorp
7、hosisoccurredwhenthefishwereabout35daysoldandmorethan30mminT.L.,butwhenthefishwere45daysold,individualslessthan24mminT.L.couldcompletemetamorphosis.Theindividualsshowedremarkabledivergencesingrowthevenunderthesamerearingconditionandtherewerethelaterstagethemo
8、reremarkabledivergences.Undertheconditionof25℃229℃inwatertemperaturethefishwhoseshowedrapidestgrowthattained2.5mm,2.9mm,5.1mm,9.2mm,15.7mm,25.8mm,28.2mm,35.5mm,41.2mm,70.4mm,83.5mminT.L.i
