1.Thetailcharacteristicsareunclear;pleaserefertothepictureforverification.ThefamilyRajidae,genusRaja,belongstothecartilaginousfishandhasmanyspecies.2.ThefollowingimageshowsRajaporosa,commonlyknownasthebossfish,Laobanfish,Huazifish,orcauldroncoverfish.Thebodydiscisslightlyroundorsquarish,withanaveragebodylengthof30to50centimeters.Thediscwidthisgreaterthanthelength,andtheweightrangesfrom1000to5000grams.3.Thetailisflatandelongated,withwell-developedpectoralfins.Thesnoutismediuminlength,withthetipprotruding.Injuvenilesandfemales,theleadingedgeisslightlyundulated,andthesnoutisslightlyprotruding;inmales,theundulationoftheleadingedgeismoresignificant,andthesnoutissignificantlyprotruding.4.Theeyesaresmallandelliptical,withthelengthofthesnoutbeing3.6to4.4timesthediameteroftheeye.Theblowholeislocatedbehindtheeye.Theanteriornostriliswideandextendstothelateralsideofthesnout,whiletheposteriornostrilishalf-ringshapedandprominentonthelateralside,formingtheinletnostril.5.Themouthisrelativelylargeandhorizontal;theteetharefineandnumerous,arrangedinapavingstonepattern.Themaleteetharesharp,whilethefemaleteetharesmooth.Thistypeoffishhabitatsincolderseaareaswithsandybottoms,oftenpartiallyburiedinsand,exposingonlytheeyesandblowholes.Theyrestduringthedayandareactivehuntersatnight.6.Themainfoodincludescrabs,shrimps,andothercrustaceans,mollusks,andsmallfish.Theirbreedingmethodisoviparous,with1to2youngbornatatime,followedbyrestandanotherpregnancywithinonetoseveraldays.7.Theeggshellisflatandrectangular,withangularprojectionsatthefourcorners,denselycoveredwiththread-likestickystrips,attachedtoalgae,fragmentedshellfish,orrocks.Theyoungfishmeasureabout9centimetersinlengthafterhatching.8.TheyaredistributedinthewesternNorthPacificOcean,theEastChinaSea,theSouthChinaSea,theYellowSea,andtheBohaiSea,buttheyieldsarenotconcentrated,andthefishingseasonisnotobvious.Theyareusuallycaughttogetherwithotherfish.9.Ifthetailispointedandflat,itmaybelongtotheDasyatidaefamily,theDasyatisgenus,whichincludesfishknownasthestingray.TheimagebelowshowsthesmoothstingrayDasyatisakajei,commonlyknownasthesmoothriverstingray,redbass,oryellowskate.