南太平洋智利竹筴鱼cpue标准化及其时空动态演变规律

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1、上海海洋大学硕士学位论文StandardizationofCPUEandSpatial－temporalDynamicChangeforChileanJackMackerel(Trachurusmurphyi)intheSouthPacificOceanABSTRACTChileanjackmackerel(Trachurusmurphyi)isoneofthemostimportantmarineeconomicfishspeciesintheworld.Chileanjackmackerelwasmainlycaughtbypu

2、rse-seinefleetsofChileinthe1970s.InternationalmidwatertrawlfleetsfromChinaandothercountrieshavetargetedChileanjackmackerelonthehighseasintheSouthPacificRegion.HowevertheproductionofChileanjackmackerelhasgreatchangesoverthepast20years.Resourcesshowedatrendofgradualdecli

3、ne.Soithasgreatsignificancetostudythespatiotemporalchangesandtofindthereasonofthechanges.ThestatusofthisfishresourcehasbeenassessedbyChileanJackMackerelsub-groupoftheScienceWorkingGroupsince2009.However,thefishery-dependentabundanceindexdataoftheinternationalfisheryuse

4、dinthestockassessmentmodelwerenotstandardized,andlargevarianceswereobservedbetweentheestimatedandobservedannualCPUEofChinesetrawlfishery.SotheCPUEmustbestandardizedandadjustedforfactorssuchashistoricalchangesinvessels,fishingfactorsandenvironmentalfactorstoserveasindic

5、esofabundance.Forthesereasons,thispaperstudythefishinggroundofChileanjackmackerelfromthetwopartsinordertoassesstheresourceofChileanjackmackerelandfindthereasonthatleadtothechangesoftheresource.Atthefirstpart,basedonthefishingdataofTrachurusmurphyifrom2008to2012whichpro

6、videdbyShanghaiDeepseaFisheriesCorporationwhosevesselsincludingKAISHUN,KAILI,KAIFUandKAIYUoperatedbeyondexclusiveeconomiczoneofChile,aswellastheenvironmentalfactorssuchasseasurfacetemperature(SST),chlorophyllconcentration,andNino3.4indexinthefishingground,thispaperbuil

7、dfourmodelstostandardizeCPUEbyGAMmodelsinordertoassessthestatusofthisfishresource.Inthesecondpart,basedonthefishingdataofTrachurusmurphyifrom2002to2011whichprovidedbyChinesevesselsoperatedbeyondexclusiveeconomiczoneofChile,aswellasthedataofseasurfaceIII万方数据上海海洋大学硕士学位论文

8、temperature(SST),weanalysistheinterannualvariationoftimeandspacedistributionoffisheriesbyusingthemethodofclusteringan