东海区刺鲳生长与资源的研究

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1、mortalityparameterswereestimatedbyusingELEFANItechnologybasedlength·frequencydata，vonBertalanffygrowthequationwasanalogized，andweestimatedtheresourceutilizingstatusofbutterfishbyBeverton·Holtdynamicpoolmodel．TheresultsindicatedthatthegrowthparametersofvonBertalanffy

2、growthequationwasL。=267．8mm：K=0·45；to=-0．63a；Totalcoefficient∞was3．55，got1jromlength-convertedcatchcurvewithbiologydatabyusingtheFiSATandnaturalcoefficient㈤was0．81fromPaluyequationaccordingtogrowthparametersandaveragewatertemperatureandZhanBingyilinearityregressione

3、quationofMandthemostaget^．Thefishingcoefficient(刃wasequalto2．74．Theexploitationrateofbutterfishinrecentyearswas0．77．Theageofgrowthinflectionpoint(芒0was1．91a，thecorrespondingweightandforklengthwasrespectively137．49，182mm；Ageofrecruitment(乙)was0．67aandcorrespondingfor

4、klengthwas18ram；Theageatfirstcapture(妨was1．10aandcorrespondingforklengthwas145mm：Criticalagewas1．78a，andcorrespondingforklengthwas177mm：Theforklengthoftheleastreproductiveindividualwas18mmandit'sagewas0．67a．Sothecatchingageofbutterfishshouldbebetween0．67aand1．78a．Ac

5、cordingtothecurveofequalcatchusingtheBeverton—Holtmodel，thepresentfisherypointatF=2．74and铲1．10alocatesinsideofoptimal4yieldsection．Theresultofassessmentindicatesthatthestockofbutterfishhasbeenexploitedrationallyatpresentandisclosetomaximumcontinuousyield．Toincreasef

6、ishingeffortandpostponetheageatthefirstcapturetooptimalageatthefirstcapture，1．25a，wouldincreaseyield，butincreaseonlyabout2．81％atmost．Sotakingintoaccounteconomicrequirementandfeasibility,thispapersuggeststhatkeepingthepresentfishingeffort伊=2．74)andtheforklengthatfirs

7、tcaptureas145mmwouldgetstabileyieldsandprotectstockofbutterfish．TheprofessionalbottomtrawlmonitoringdataintheEastChinaSeafrom2001to2005showthattheannualcatchofbutterfishisfluctuant，buttheproportioninthetotalcatchintheEastChinaSeaincreasedpersistentlyandgot4．4％in2005

8、．TheorderkeptfourthinallspeciesandcatchingweightwasevenmorethanPampusargenteusin2003and2005．Themaximumcatchperuniteffort(CPUE)was167．3kg／h