简介:AsurveywasconductedintheequatorialareaofIndianOceanforabetterunderstandingofthedynamicsofhookdepthdistributionofpelagiclonglinefishery.Wedeterminedtherelationshipbetweenhookdepthandverticalshearofcurrentcoefficiency,windspeed,hookpositioncode,sineofwindangle,sineofangleofattackandweightofmessengerweight.Weidentifiedthehookdepthmodelsbytheanalysisofcovariancewithagenerallinearmodel.TheresultsshowedthatthewindeffectonthehookdepthcanbeignoredfromOctobertoNovemberinthesurveyarea;thesurfacecurrenteffectonthehookdepthcanbeignored;theequatorialundercurrentisthekeyfactorforthehookdepthinIndianOcean;andthereisanegativecorrelationbetweenthehookdepthandverticalshearofcurrentandangleofattack.Itwasalsofoundthatthedeeperthehookwasset,thehigherhookdepthshoalingwas.Theproposedmodelimprovestheaccuracyofthepredictionofhookdepth,whichcanbeusedtoestimatetheverticaldistributionofpelagicfishinwatercolumn.