FIELD: agriculture.
SUBSTANCE: zone is created in a reservoir, with a gradient change in the content of oxygen dissolved in water by introducing the substances into the said zone, which reduce its content in water.
EFFECT: fish motion towards the reservoir parts with oxygen regime favourable for them or it stops their motion in the direction of the reservoir part with low oxygen content.
2 cl, 2 dwg, 1 tbl, 3 ex
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