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Finding a Profitabe Population Density in Rearing Summerlings of European Crayfish Astacus astacus L.
Keller M 
Published Online: 6/1/2020
Abstract
Our common interest is to save our native crayfish from extinction! The restoration of European crayfish populations in our country has brought a high demand for young crayfish of the species Astacus astacus (Edelkrebs). Restocking waters holding dense sportfish populations with newly hatched juveniles of crayfish is not very successful. On the other hand, it is not very easy to rear larger crayfish such as summerlings (one-summer-old crayfish) under profitable conditions. We all know that the growth and survival of crayfish depend on population density. But any commercial rearing of summerlings is only possible if one attains a certain growth rate at high densities and acceptable survival rates! In our 'First Bavarian Crayfish Hatchery' we have developed a method giving optimal results in breeding and rearing summerlings as there are: Length of summerlings (3 1/2 months old): 2-3 cm, Population density of juveniles: 400 per m,2, Survival rate: 70-80%.
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Keller M. (1988). Finding a Profitabe Population Density in Rearing Summerlings of European Crayfish Astacus astacus L. Freshwater Crayfish 7(1):259-266. doi: 10.5869/fc.1988.v7.259
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Published Online: 6/1/2020
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