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1.
美国红鱼繁殖习性及诱导产卵技术初探   总被引:2,自引:0,他引:2  
美国红鱼(Sciaenops ocellatus)亦称眼斑拟石首鱼,属鲈形目,石首鱼科,拟石首鱼属。原产于美国大西洋沿岸及墨西哥湾。此鱼肉质鲜美,生长迅速,是美国、台湾等地重要的养殖鱼种。1991年7月由国家海洋局第一海洋研究所从美国引进,1995年9月自然性成熟、产卵,在我国首次育出第一代红鱼幼苗。1996年、1997年和1998年连续3a,通过控制红鱼的饲养水温和日光照周期,成功地使其在2~9月份保持连续产卵。关于美国红鱼的繁殖习性和诱导产卵技术的研究,目前国内尚未见报道。1 材料和方法1 …  相似文献   

2.
BasedontheNanshalslands,clttselatollconoeption-rentotesenaingsystetninPutI,throughthesolutionoftheitfotmationfunctionvalueandisostaticvalueofclaaxlandquasi-closalatoll,andbyusingtopologicalandysisongrowthformandthecompaiteremotesensingquantbationdataastheculatingcefficients,thefaturevevectorsystemanditsmathematicalmodeloftwokindsofatollarebuilt,andthemultivariateanalysisismadewithsomeexamples.  相似文献   

3.
INTRODUCTIONBecausesalinityisanessentialfactorinoceanographicstudies ,andanimportantparameterinsaltchemicalindustriesandmaricultureaswellasecosystem ,thesalinitydefinitionanditsmeasurementarebeingcontinuouslystudied .Researchershavebeenconstantlyworking…  相似文献   

4.
INTRODUCTIONThegenusTetraselmisStein ( 1 878)isagreenflagellates (Prasinophyceae)thatconsistsofmanymarineaswellasafewfreshwaterspecies .Marinespeciesoftenoccurindensepopula tionscausingbloomsintidepoolsorbays ,therebybeingimportanttoanunderstandingofthedynam…  相似文献   

5.
Outer frequency spectrum of sea waves and its equilibrium range   总被引:3,自引:0,他引:3  
Thepresentpaperdefinesthegeneralizedapparentenergydistributionandderivestheanalvticalformoftheso-calledgeneralizedouterfrequencyspectrumornthorderapparentfrequencyspectrum.Itisshownthatthegen-eralizedouterfrequencyspectrumhasanequilibriumrangewithanexponent(n+3)andtheupperlimitoftheex-ponentis-3.TheresultsofthispaperareuniversalandareapplicableforanyotherwavephenomenaiftheraytheoryofwavesandtheLonguet-Higgins,linearrandomwavemodelareexactenoughfortheirdescziption.  相似文献   

6.
1 .IntroductionTheappraisalofagooddesignforaverylargefloatingstructure(VLFS)thatwillserveinaspeci fiedoceanarearequiresthatthestructuralsystembeeconomicallydesigned ,therequirementsforitsfunctionbesatisfiedandthestructurekeepsstableinitswholeserviceperio…  相似文献   

7.
1 .IntroductionWhenatankerisberthedormooredtoanoceanplatform ,whichisusuallyinopenseas,thetankerwillsufferforcesgeneratedbywaves ,windandcurrent.Inmostofthepreviousstudies ,thein fluenceofcurrentorthecombinedwaveandcurrentwasconsideredtobethemainobject.Ins…  相似文献   

8.
INTRODUCTIONProvenanceofmarinesedimentshasalwaysbeenafocusedprobleminmarinesedimentge ology.Recognitionofendmembersandestimationoftheirrelativeproportionsfrommixedsedimentshavebeenakeycontentinthestudyofprovenance .Forthisaim ,itisnecessarytoselectendme…  相似文献   

9.
INTRODUCTIONThelargediametercylindricalstructureisoftenusedasthewharfandthebreakwaterstructureofharbor.Sinceittakessometimetofillmaterialintothecylinderafterthecylindershellissunkentotheseabed ,thestabilityofthecylinderbecomescontrolconditionforthesaf…  相似文献   

10.
Chemistryofmarineresources-XIX.Themoleculedesignandsynthesisofcrow-linktypealkydresinanditsenrichmentbehaviourforpotassiumion...  相似文献   

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