Influence of hydraulic construction on reproduction of Atlantic salmon of the Tuloma River
The data on habitat and abundance of Atlantic salmon of the Tuloma River are generalized. It is shown that construction of Nizhnetulomsky and Verhnetulomcky dams resulted in reduction in Atlantic salmon habitat (8,8% and 14,3%, respectively). After closing Verhnetulomcky fishway only 24% of spawning grounds is accessible for Atlantic salmon. Since Atlantic salmon reproduction took place mainly in the rivers located down Verhnetulomcki dam, this dam construction and closing of Verhnetulomcky fishway has not affected the salmon abundance. Opening of Verhnetulomcky fishway would give a real opportunity to increase the Tuloma stock of Atlantic salmon considerably.