南海13种岛礁鱼类的种群动态评估及开捕规格建议

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1、‘islandswhichleadanourishingfishgroundasaveryimportantcoralreefecosystem．Amongthem，Nansha，XishaandZhongshawhichhavehighernumbersinreefsandlargerwaterareasaretraditionalfishingcenterinSouthChinaSea．DevelopmenttofisheryresourcesinXisha,ZhongshaandNanshaaregettingmoreandmor

2、eattention，withtheSouthChinaSeainshorefisheryresourcesoverfishingandhuman’Sincreasingdemandtonaturalaquaticproducts．StudyonthefishbiologyinreefareasinSouthChinaSeaisthepracticeofguidelinethat“developmentofNansha，fisheryisfirst”，alsosatisfytheneedofcreationofdatabaseorpro

3、tectionareawithgermplasmresource．Inthispaper,accordingtothedataoftwicefisheryresourcessurveyin2004—2005，fishscalessamplesof13specieshavebeencollected．Afterobservingofannualcharacteronscales，theagestructureof13speciesareconfirmed．Growthequationsof13speciesaredeterminedacc

4、ordingtothebodylength，weightandagestructure．Then，thecurvegraphsofequalcatchof13specieshavebeengotwiththepopulationdynamicsestimatemethod．Andthenwithproductionoffisheryandfishitselfgrowthrules，suggestionofspecificationatfirstcaptureof13specieshasbeengot．Researchresultssho

5、wasfollows1、Theannualcharacterofscales：themostcommontypeoffingsisthecuttingringsandfracturerings．Thecharacterofannualringwasusuallyobservedclearlyinthelateralareaofscales．2、Therelationshipbetweenlengthandweight：theparameterbofpowerexponentmodelfortherelationshipbetweenle

6、ngthandweightisfrom2．5to3．5in1species，andthesespeciesbelongstotheconstantgrowthfishornearconstantgrowthfish；theparameterboftwospeciesislessthan2．5，andwhichrelatedtolowfishingofyoungfishandsmallextentoflengthbygillselective．3、ThegrowthparameterKofVon—Bertalanffygrowthequa

7、tionhasbeenshowedastheaveragegrowthrateoffisheswhichwasfromO．120to0．313．4、Optimumfishingmortalitycoefficientandthespecificationatfirstcapture(includingageatfirstcaptureandlengthatfirstcapture)of13fishspecieshasbeengotbasedonthedynamicpoolmodel(alsocalledyieldperrecruitme

8、ntmodel)，consideringreproductionoffishandfullexploiting．Keywords：Specificationatfirstcapture，dynamicpoo