Pike and red swamp crayfish: a new case on predator-prey relationship between aliens in central Spain |
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| Authors: | B Elvira G Gnicola A Almodovar † |
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| Institution: | Department of Animal Biology I, Faculty of Biology, University of Madrid, E–28040 Madrid;Department of Ecology, Agricultural Research Service, Community of Madrid, El Encin, P.O. Box 127, E–28800 Alcaláde Henares, Madrid, Spain |
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| Abstract: | Pike in the Ruidera Lakes (central Spain) chiefly ate the recently introduced crayfish Procambarus clarkii . It was the dominant prey in occurrence, number and biomass for every size class and season. Likewise, number (up to 27) and total weight of ingested crayfish were directly related with pike size. The principal prey fish were all introduced species (except the endangered Blennius fluviatilis ), most native species having disappeared since pike were introduced in 1953. (c) 1996 The Fisheries Society of the British Isles |
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| Keywords: | pike Esox lucius Procambarus clarkii predation feeding Spain |
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