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Familj Atyidae

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Familj Atyidae Familj Atyidae I artikeln behandlas släktena Caridina och Neocaridina men det finns många fler atyida släkten. Det finns 359 beskrivna arter eller underarter. Familjen är representerad i hela världen förutom Antarktis men de flesta arterna återfinns i östra Asien, Australien och tropiska Afrika. Arterna inom akvariehobbyn kommer huvudsakligen från Asien och de flesta är odlingsformer. De flesta arterna lever i sötvatten även om vissa arter åter- finns i bräckt vatten. Yngel av vissa arter kan förekomma i marina miljöer. Familjen förekommer i alla slags habitat. De finns i ström- mar, under stenar i vattenfall, strandkanter och mattor av flytväxter. Flera arter lever endast i underjordiska vatten- drag. De första gångbenen eller klorna hos Atyidae är unika med komplexa borstar som de kan använda till att filtrera partik- lar ur vattnet eller plocka föda från biofilmen på botten. Limnocaridina iridinae från Tanganyikasjön lever inuti en levande mussla och Caridina spongicola från Lake Towuti, Sulawesi lever inuti en levande sötvattenssvamp. Många arter har förkortat yngelstadium och alla Neocari- White pearl, Neocaridina cf. zhangiiajiensis ”white”, hona med rom till dina har inget yngelstadium alls. Ur äggen kommer det fullt vänster och hane till höger. utvecklade räkor. Många grottlevande arter är hotade och minst en är utrotad Arter i släktet Caridina har ofta mycket begränsade utbred- eftersom deras miljö har påverkats eller helt enkelt försvun- ningsområden där de är endemiska. nit. Skulle det dyka upp grottlevande räkor i handeln ska man avstå från att köpa dem. Undantaget skulle vara om Viktoriasjöintresserade personer känner nog igen namnet man vet att de inte är hotade eller att de är odlade. Caridina nilotica. Det är denna räka som fullständigt exploderade i antal samtidigt som nilabborren gjorde det- Vuxna amanoräkor (Caridina multidentata, över 4 cm) går samma. bra att hålla med mindre ciklider som Pelvicachromis och Teleocichla. Neocaridina och Caridina cf. cantonensis är I flera gamla sjösystem på Sulawesi har caridinaräkor mer riskabelt men fullvuxna (2-3 cm) går ibland att hålla bildat små artflockar med färgglada räkor med specia- med fisk somPelvichachromis taenitaus och Apistogramma liserade klor. Dessa har jämförts med ciklidartflockarna i utan att de blir uppätna, men några yngel överlever sällan. Afrikas stora sjöar. Dessa räkor har extremt begränsade utbredningsområden och kostar mycket pengar i handeln. Ola Svensson Om dessa nyupptäckta räkor inte visar sig vara odlings- bara är risken stor att akvariehandeln blir ett hot mot deras Källor fortlevnad. Dessa sjöar är dessutom hotade av främmande De Grave S, Cai Y, Anker A (2008) Global diversity of shrimps arter som karp och tilapia, föroreningar samt avskogning (Crustacea: Decapoda: Caridea) in freshwater. Hydro- med efterföljande erosion och sedimentation i sjöarna. biologia 595:287-293. Fryer G (2006) Evolution in ancient lakes: radiation of Tanganyi- Utan information om artens situation och om den är möjlig kan atyid prawns and speciation of pelagic cichlid fishes att odla bör man nog inte köpa vildfångade Caridina från in Lake Malawi. Hydrobiologia 568:131-142. Sulawesi, särskilt inte om man inte har tänkt satsa allt på von Rintelen K, von Rintelen T, Glaubrecht M (2007) Molecular att odla dem. phylogeny and diversification of freshwater shrimps (Decapoda, Atyidae, Caridina) from ancient Lake Poso Även i Tanganyikasjön finns det en liten räkartflock med (Sulawesi, Indonesia) - The importance of being colour- små specialiserade atyider. Dessa är föda för ciklider och ful. Mol Phylogenet Evol 45:1033-1041. Altolamprologus compressiceps, Neolamprologus furcifer och N. toae har rapporterats nästan uteslutande leva på dessa räkor. FAKTA.
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