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The early history of signal crayfish introducion into Europe
Svärdson G 
Published Online: 6/1/2020
Abstract
In the mid-1950s, there was a sudden paradigm shift in Swedish freshwater fisheries management. Apart from legal restrictions -- such as size and gear limitations, and closed seasons -- the release of newly, hatched fry or fingerlings had been the standard method of fisheries management. The number of annually released fry culminated from 5 million in 1905 to 235 million in 1939 (Hannerz, 1956). Ecologically-based criticism mounted, however, and the stockings declined to about 163 million in 1954.
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Svärdson G. (1995). The early history of signal crayfish introducion into Europe. Freshwater Crayfish 8(1):68-77. doi: 10.5869/fc.1995.v8.068
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Published Online: 6/1/2020
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