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Two physical factors light or substrate (fibre glass, artificial vegetation, gravel and mud) were determined in a 24 m long artificial channel to have importance on the distribution of 33 tench 2+, mean size 11.8±0.9 cm S.L. For this purpose in five trials tench could select between the half of the channel occupied by their preferred light intensity (inferior to 10 lux) combined with the less preferred...
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