东海区小黄鱼资源评估与其管理策略的研究

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1、◆●上海海洋人学硕士学位论文渔业的可持续利用。关键词：东海区，小黄鱼，渔业资源评估，渔业资源管理III●上海海洋人学硕士学位论文StudyonthefishstockassessmentandmanagementstrategyofLarimichthyspolyactisintheEastChinaSeaAbstractSmallyellowcroaker,asoneofourcountry’Seconomyfisheryspecies，alwaysoccupiesaveryimportantpositioninourcountry’Sfisheryindustry．Itsre

2、sourceshaveundergonethreephasesincludingprosperity,declineandrecovery．Duringrecentyears，althoughtheresourcesofsmallyellowcroakergetsomerelativerecovery,thephenomenoncontainingitsindividualminiaturization，advancedfirstmaturity,juvenilefishcompositionamongcatchesbecomeincreasinglyprominent．Ther

3、esourcestructureisratherfragile．Inordertohaveabetterunderstandingofthecurrentsituationofsmallyellowcroaker’resources，andtoreasonablyuseandmanagesmallyellowcroaker，sfisheryresourcesundertheavailablefisheryresources，thedatausedforthisstudyareobtainedfromthefourquarters’demersaltrawlinginvestiga

4、teddocuments，FisheryStatisticsYearbookandseaconditions(temperature，runoffandwindspeedetc．)from1999to2008inEastChinaIV●上海海洋人学硕士学位论文Sea．Thepapersystematicallyanalyzessmallyellowcroaker’Sresourcesfromdifferentangels，usingmathematicalstatisticsandstockassessmentmodel，inordertoprovidereferablevalu

5、eforthecontinuousdevelopmentofsmallyellowcroaker’SresourcesintheEastChinaSea．Firstly，thispaperstudiesonthesmallyellowcroaker’SresourcevolumeinEastChinaSeafrom1999to2008．Accordingtotheresultoftheverificationandresearch，theusageoftheEastChinaSea’Ssmallyellowcroakerisonahighdevelopedlevel．Theave

6、rageannualresourcevolumefrom1999to2008doesn’tchangegreatly,buttheresourceofearlyfishingseasonvariesinacertainlevelwhichisrelatedtochangeofeachyear’sfishingmortalitycoefficient．Basedonthecomparisonbetweeneachyear’scatchesandMSY,theannualcatchesallexceedMSY．Butfromtheincreasingtrendofsmallyello

7、wcroakers’productivequantityinrecentyears，itisfoundthattheresourcesofsmallyellowcroakerdon’tdecline．Thispaperthinksthatsincethefirstcaptureafterthesummercloseseason，thejuvenilefishisservedasmaincatcheswhichresultsinthecatcheskeepahighincreasi