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    Institute for Informatics, Ludwig Maximilian University of Munich

    Analysis of sibling cannibalism among pike, Esox lucius, juveniles reared under semi-natural conditions

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    Sibling cannibalism in pike, Esox lucius , larvae and juveniles living in outdoor rearing ponds was studied using stomach contents analysis. For the two initial densities tested (6 and 18 larvae m super(-2), equivalent to 12 and 36 larvae m super(-3)), cannibalism was non-existent during the larval period (13 to 35 mm total length) and was observed only during the juvenile stages. At initial stocking densities of 18 larvae m super(-2) (36 larvae m super(-3)), cannibalism was observed from 21 days after the start of exogenous feeding (mean total length: 60 mm) onwards. At a mean total length of 100 mm and for initial stocking densities of 6 and 18 larvae m super(-2) (12 and 36 larvae m super(-3)), the average proportions of cannibals in the populations of juveniles were 7.8% and 41.3% and the cannibals accounted for 15.5% and 65.9% of the total pike biomass, respectively. In stomachs of cannibals, young pike were the dominant prey in terms of weight. There was a strong positive correlation between predator and prey size and the mouth size of a cannibal was found to be an important constraint determining maximum victim size. Prey size selection could be demonstrated for several length-groups of cannibals

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    Description

    Title : Analysis of sibling cannibalism among pike, Esox lucius, juveniles reared under semi-natural conditions
    Author(s) : Christian Bry, Edgar Basset, Xavier Rognon, François Bonamy
    Abstract : Sibling cannibalism in pike, Esox lucius , larvae and juveniles living in outdoor rearing ponds was studied using stomach contents analysis. For the two initial densities tested (6 and 18 larvae m super(-2), equivalent to 12 and 36 larvae m super(-3)), cannibalism was non-existent during the larval period (13 to 35 mm total length) and was observed only during the juvenile stages. At initial stocking densities of 18 larvae m super(-2) (36 larvae m super(-3)), cannibalism was observed from 21 days after the start of exogenous feeding (mean total length: 60 mm) onwards. At a mean total length of 100 mm and for initial stocking densities of 6 and 18 larvae m super(-2) (12 and 36 larvae m super(-3)), the average proportions of cannibals in the populations of juveniles were 7.8% and 41.3% and the cannibals accounted for 15.5% and 65.9% of the total pike biomass, respectively. In stomachs of cannibals, young pike were the dominant prey in terms of weight. There was a strong positive correlation between predator and prey size and the mouth size of a cannibal was found to be an important constraint determining maximum victim size. Prey size selection could be demonstrated for several length-groups of cannibals
    Subject : unspecified
    Area : Other
    Language : English
    Year : 1992

    Affiliations Institute for Informatics, Ludwig Maximilian University of Munich
    Journal : Environmental Biology of Fishes
    Volume : 35
    Issue : 1
    Pages : 75 - 84
    Url : http://www.springerlink.com/index/10.1007/BF00001160
    Doi : 10.1007/BF00001160

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