墨西哥湾扇贝新品系选育过程中关键技术的分析

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1、bymixedcrossingofmorethan50individuals，thetotalselectionpressurewas0．1％．Theresultsshowedthatjuvenilesurvivalrateofpositiveselectiongroup，negativeselectiongroupandcontrolgroupwere12．04％士0．60，8．61％士O．55，10．28％士0．13respectively；dailygrowthofbodyweight(mg．d一)were60．

2、589土1．412，40．889士1．225，48．244士1．346respectively；dailygrowthofediblepartweight(mg．d叫)were22．544士1．203，13．01l士1．076，16．978士1．114respectively；dailygrowthofadductorweight(mg．d_)were10．383士O．672，5．428士O．663，8．078士O．598respectively．Theoffspringofpositiveselectiongroup

3、displayedobviousadvantageintermsofjuvenilesurvivalrate，dailygrowthofbodyweight，dailygrowthofediblepartweightanddailygrowthofadductorweightanalysisofvarianceandmultiplecomparison媾

4、weightoftheoffspringofpositiveselectiongroupanditalsoenhancedtheeffectofartificialreproduction．4．IndividualswiththeshellheightlargestsizewerechosenfromthelargecultivatedpopulationasthebreedingpopulationanditwasbasedonthetraitofshellheightofF3generation，then12sel

5、f-fertilizationfamilylineswiththelarge—sizeshellheightwereestablished(theoffspringofA4wasdead)，whoseparentswerechosenatradomfromthebasepopulation，andeachhaditscontrolgroupreproducedmixedcrossing(L0)，thentheevaluationwasconductedtoself-fertilizationfamilylinesins

6、pectingindexsuchasgrowthandsurvivaloftheoffspring．Theresultsshowedthatthefertilizationratehadinsignificantdifferencesbetweenself-fertilizationfamilylinesandthecontrolgroups，buthatchingratewassignificantlydifferentfromthem(P

7、helllengthofveligerofB3，C2familylineswashigherthanthatinthecontrolgroupandtheotherself-fertilizationfamilylineswerelessthanthecontrolgroup；Thesurvivalrateinallgroupsvariedfrom21．67％to80．33％acrosstheadultstagein4months；duringthisperiod，B3，C2self-fertilizationfami

8、lylinesdisplayedmoresignificantgrowthadvantagethantheothersintheshelllength，shellheight，shellwidthandbodyweight(P<0．05)．Thecomprehensiveevaluationofthefourtraitsofdif