Effects of Environmental Parameters on the Distribution of Bullhead Cottus gobio with Particular Consideration of the Effects of Obstructions

1. The bullhead Cottus gobio is a small-sized fish that occurs m stony streams and lakes in Switzerland. Its numbers have declined and its distribution has become narrower over the last 30 years, most probably due to chemical pollution and/or structural habitat deterioration, and at present it is cl...

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