Effects of gravel size and peat material concentrations on embryo survival and alevin emergence of brown trout,Salmo trutta L. |
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Authors: | Tommy I Olsson Bo-Göran Persson |
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Institution: | (1) Institute of Ecological Zoology, University of Umeå, S-901 87 Umeå, Sweden |
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Abstract: | Embryo survival and alevin emergence pattern of brown trout were studied in simulated redds with different homogeneous gravel sizes and different concentrations of peat material. Optimal survival (95%) occurred in 18 mm gravel and survival decreased with decreasing gravel size. High concentrations (40%) of peat material resulted in low survival (65%). The proportion of premature emerging alevins increased in finer gravels and at high peat concentrations. Premature alevins had a large yolk sac and are probably very vulnerable to predators. |
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Keywords: | brown trout embryo survival alevin emergence gravel size peat material |
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