东黄海鲐鲹鱼资源丰度、作业渔场时空分布及其与表温关系的研究

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1、上海水产大学硕士学位论文groundinthisareaisbiggerthanthatofsouthernfishingground．Especiallyin1999，thecatchwasveryhigh．MaybeitwastheresultofthecycleaffectionbythechangeofScomberjaponicusresourceinYellowSea．2．BasedontheanalysisandresearchaboutfishinggroundinEastChinaSeaandYellowSeafrom

2、JulytoDecemberofeveryyear,itwasfoundoutthat：Insouthemfishingground，thegravitycenterofcatchfromJulytoSeptemberliesinwatersnear26030’～27。30'N、122030，～123。30EanditshowsUSatrendofmovingfromsouth．westtonorth。eastThegravitycenteroffishinggroundinJulyliesin123。09％，26。59rN，123。0

3、9『E，27。32％1inAugustand123。15，E，28。08NinSeptember．Innorthernfishingground，thegravitycenterofcatchcenterfromOctobertoDecemberbasicallyliesinwatersnear330～38。N、123。30’～124。30，EanditshowsUSatrendofmovingfromnorthtosouth．ThefishinggroundcenterinOctoberliesin37。057N．123。5TE；35

4、。36，N，124。02'EinNovemberand34。13'N，123。52'EinDecember．3．Theresultsontheresearchaboutfishinggroundgravitycenteraggregativeindicatethefollowing：insouthernfishingground，thecatchgravitycentersinJuly1998andinAugust，September2001weredifferentfromthoseinotheryears．Innorthemfish

5、ingground，themonthlyfishingcatchgravitycenterbetweendifferentyearschangesalot．Thechangeoffishinggrounddistributionisrelatedtothechangeof占塑查主查兰堡主堂垡丝塞——．strengthofwarmcurrentandcoldcurrentinYellowSea．InOctober,1998and2000，thefishinggroundmovednorthwardmorethan1。latitudebec

6、auseofthestrongwarmcurrentinthefirststageoffishingseRson．Fromthepointofwholeyear’ssituation，thefishinggravitycenterin2001，2003and2004ehangesalotcomparedwiththoseofotheryears-4．AccordingtotheanalysisofvariationofCPUE，weseethatapartfromthe14tonspernetin2000whichisrelativel

7、ylow,theaverageCPUEofthewholefishinggroundinotheryearsremainsstable，whichisaround20tonspernet．Butthereisartobviousdifferencebetweensouthernandnorthernfishinggrounds．TheaverageCPUEinnorthernfishinggroundis21tonspermetwhileitis17tonspernetinsouthernfishingground．Fromthemon

8、thlyaverageCPUE，CPUEinJuly’AugustandSeptemberisbetween10and20tonspernetwhileCPUEinOctober,NovemberandDe