南海鸢乌贼水声学测量和评估相关技术研究

106201412SouthChinaFisheriesScienceVol.10No.6Dec.2014doi10.3969/j.issn.2095－0780.2014.06.0012014-03-062014-05-202013BAD13B06NFZX20132014TS182013ZD03“”2009－20141984－。[e-mail]1975－。[e-mail]111112121.5103002.11602338kHz、120kHzSimradEK6070kHz120kHz2SimradEY602013SthenoteuthisoualaniensisTS、、。TS220010～50m55～80m220010～35m、50～75m115～155m。S932.4A2095－0780－201406－0001－11HydroacousticdetectionandestimationtechniquesofsquidSthenoteuthisoualaniensisintheSouthChinaSeaZHANGJun1CHENZuozhi1CHENGuobao1QIUYongsong1LIUShigang12YAOZhuang121.ScientificObservingandExperimentalStationofSouthChinaSeaFisheryＲesources＆EnvironmentsMinistryofAgricultureSouthChinaSeaFisheriesＲesearchInstituteChineseAcademyofFisherySciencesGuangzhou510300China2.DalianOceanUniversityDalian116023ChinaAbstractAccordingtotheacousticsurveydataofsquidSthenoteuthisoualaniensisintheSouthChinaSeain2013obtainedbySim-radEK6038kHz120kHzandSimradEY6070kHz120kHzscientificechosoundersweinvestigatedthetargetstrengthTSandspatialdistributionofsquidinterferenceofzooplanktonpotentialofdBdifferencetechniqueintheacousticidentification.TheresultsrevealthattheTSofsquidcouldbemeasuredbyinsitumethodwithlight-fallingnetasbiologicalsamplingdevice.Squidechowasnotobviousundernaturallightconditionbutthedensityofsquidincreasedsignificantlywhenthelightwason.Before2200thesquidsmainlyassembledinlayersat10～50mand55～80mwhileafter2200thesquidsassembledinlayersat10～35m50～75mand115～155m.Zooplanktonandpelagicfishcausedconsiderableinterferenceintheacousticestimationespe-ciallyatnightsodifferentthresholdsshouldbeselectedduringdifferenttimeperiods.ThedBdifferencetechniquewhichmightbeim-portantindiscriminatingsquidechogramshouldbestudiedfurther.KeywordsSthenoteuthisoualaniensistheSouthChinaSeafisheriesacousticstargetstrengthvolumebackscatteringstrength210Sthenoteuthisoualaniensis、、、、1－3。、、4－8。9。“”、、10－13。206014－18。targetstrengthTS、、、。11.1SimradEY60SimradEK6020136～71Fig.1SamplingstationsofS.oualaniensis。1。SimradEY6021.5m6.0knots。SimradEK60“”。19。SimradEY60201393。SimradEK60201368。SimradEY60SimradEK6012。1SimradEY60Tab.1SettingofmainparametersofSimradEY60echosounderparameterparametersettingoftransducer70kHz120kHzunittransducertypeES70-7CES120-7Ctransducergain27.0027.00dBtransmittingpower800500Wpulseduration0.5120.512msalongship3dBbeamwidth7.007.00degreeathwartship3dBbeamwidth7.007.00degreeabsorptioncoefficient0.0180.045dB·m－1equivalentbeamangle－21.00－21.00dB632SimradEK60Tab.2SettingofmainparametersofSimradEK60echosounderparameterparametersettingoftransducer38kHz120kHzunittransducertypeES38BES120-7Ctransducergain26.5027.00dBtransmittingpower2000500Wabsorptioncoefficient0.00660.046dB·m－1alongship3dBbeamwidth7.087.00degreeathwartship3dBbeamwidth7.037.00degreeequivalentbeamangle－20.6－21.0dB3Tab.3SettingofsomeparametersconcerningsingletargetechoescollectionsforS.oualaniensistarget-strengthmeasurementsparametersettingunitpinginterval1srange300mTSthreshold－74dBpulselengthdeterminationlevel6.00dBminnormalizedpulselength0.75maxnormalizedpulselength1.5maxbeamcompensation4dBminimumecholength0.8maximumecholength1.8maximumphasedeviation4Echo-view4.9。3TS。TSTSσσσTSTS=10lg∑ni=1σin20。TSmantlelengthMLTS=algML+bab。Mi-crosoftExcel2010SPSS16.0。TS。TS90%。1900210040min。2000～210010～50mcell100ping×5m。1.2。4601kW230、1。290m85m36mm20mm50m。2SE-58。、、、。1.3SimradEK60。SimardPI444.0～4.3kn4。4104Tab.4Mainparametersofnettrawlsingle-vesselsinglecodmidwatertrawlnet/mstraightenmouthperimeter176/mstraightennettotallength110.9/mheadropelength59.52mouthmeshnumber220/mmmouthmeshsize800/mmcodendmeshsize501.4SimradEY6070kHz120kHz。。22.1TSTS。TS21221－22。Nv“”NvbaddataregionTS23。2。32013TSNv70kHz。4Nv＞0.16TS。54ML。Nv=0.16TSNv0.16TS。TSMLTS≥－70dBTS。20139TS56270kHzFig.2Echogramshowingsingle-fishechotracesfor70kHzThetwogreenlinesarestartinglineandendlineofanalysisrespectively.370kHzNvSimradEY602013992000～210010～50mFig.3EchostrengthasafunctionofNvindexforS.oualaniensisfor70kHzTheacousticdatawerecollectedbySimradEY60during2000～2100onSeptember92013inthemiddleofSouthChinaSeawaterlayersat10～50m.65470kHz2Fig.4Target-strengthdistributionofselectedsingle-fishechotracesfor70kHzTheacousticdatawerethesamewiththoseinFig.2.532013992100～213010～50mFig.5MantlelengthdistributionofS.ualaniensiscorrespondingtoFig.3Thebiologicalsampleswerecaughtbylightfalling-netsamplingduring2100～2130onSeptember92013inthemiddleofSouthChinaSeawaterlayersat10～50m.TSML。70kHzTSMLTS70kHz=19.13lgML－77.84n=9Ｒ2=0.8782ML7.5～25cm120kHzTSMLTS120kHz=26.68lgML－88.00n=9Ｒ2=0.8521ML7.5～25cm。670kHz120670kHz120kHzTSMLFig.6ＲelationshipbetweentargetstrengthandmentallengthofS.oualaniensisforfrequenciesof70kHzand120kHz7abSimradEY60120kHzFig.7EchogramofsquidswithnormalconditionaandlightconditionbDatawerecollectedbySimradEY60120kHzkHzTSML。2.27。8SvdB。97TS。20139201600～240013.02°N、6105Tab.5ProportionofS.ualaniensisbynumberandweightforeachsiteallbiologicalsampleswerecollectedbyfalling-netsitegeographiclocationnumberofsquid%weightofsquid%No.115.00°N114.45°E454597.2429161997.69No.215.00°N115.53°E