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Effects of gravel size and material concentrations on embryo survival and alevin emergence of brown trout salmo trutta



Effects of gravel size and material concentrations on embryo survival and alevin emergence of brown trout salmo trutta



Hydrobiologia 135(1-2): 9-14



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 (.gtoreq. 40%) of peat material resulted in low survival (.ltoreq. 65%). The proportion of the 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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Accession: 005306103

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