Thefollowingiswrittentohelpnon-marineBIOLOGistsuseseaurchinsoccasionallyinteaching;disregardifyouhaverunningseawatertanksinyourlab!

Gravidanimalscanbeobtainedvirtuallyyearround.Animalscanbeorderedtoarriveonthemorningrequired.Thisassuresthattheywillbefresh,butcanleadtonervouslywaitingaroundforFed.Ex.Also,anyanimalsnotusedarewasted.IprefertomaintaintheanimalsintanksofInstantOceanuntilneeded.IhavehadthebestluckwithLytechinuspictus,LytechinusvariegatusandArbaciapunctulata.Strongylocentrotuspurpuratusareverydifficult,butcanbestoredinthecoldroomwrappedinwetpaperforafewdays.

Ifyouplantodothis,setupyourtanksseveralweeksinadvance.Introducesomemarineorganismsintothetank;algaeorslimyrocksfromtheoceanorestablishedmarinetanksareideal.Ifslimyrocksarenotavailable,itispossIBLetogetdriedbacteriaforconditioningtanksfromfishstores.Askyoursupplierforthetemperatureandsalinitythatyouranimalswillbeaccustomedtoandadjustyourtankconditionsifnecessary.Salinitycanbeadjustedwitharefractometerorhydrometer.L.pictusandS.purpuratusneedtobemaintainedalowertemperatures(12-15°C);L.variegatusandA.punctulatacanbekeptatroomtemperature.Itisimportanttoplanonlotsofroomperurchin,especiallyforthelargerspecies;Iwillput20L.pictusper20gallontank,butonly6-8L.variegatus,dependingontheirsize.Itisalsoimportanttohaveadequatefiltrationandaeration;IuseaSkilterexternalfilterunitwithabubblefilter.Also,Illuminatethetankusingaquariumlightsorfluorescentlightsfor12-14hoursperday.

Whentheanimalsarrive,graduallyacclimatethemfromtheirshippingcontainersinyourtankwater.Ifanyanimalsarespawning,DONOTputthemintothemaintank.Theycanencourageotherstodothesame.Also,watchanimalscarefullyforsignsofillhealth-droopingspinesandlistlesstubefeet-andREMOVE.Dyingurchinswillreleasegametesand...(seeabove).Youcancollectgametesfromquestionableanimalsandstore.

Ifyoukeeptheanimalsformorethanafewdays,theywillneedtoeat.Thebestsolutionistorequestalgaeorkelpfromyoursupplier(MarinusandGulfSpecimenareverycooperativeaboutthis).Withliveplants,itisevenmoreimportanttolightthetank,otherwisetheplantswilldie.Ihavenothadmuchluckwithdriedseaweed,carrotsorlettuce.Changethefiltersfrequentlyandvacuumthedebrisfromthebottombysiphoning(andreplacingabout10%ofthewater)everyweek.Withcare,L.pictusanimalscanbekepthealthyandgravidformonths.

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