Apparatus which preferably is usable for fish breeding by means of string bags and which is intended to pump up water of a watercourse from a low level to a higher level, at which the string bag intended for fish breeding is positioned, preferably to a level just below the water-line. The apparatus is characterized by the combination of the following features: the apparatus comprises an electrically driven motor (1), which is stationarily arranged above the water-line (4) and which is intended via an essentially vertical shaft (2), journalled freely from oil, to drive a device (3), which is positioned below the water-line (4) at a relatively large distance from this one for pumping up water; the device (3) is intended to be positioned at a lower part of an essentially vertically extending pipe (7) which is open at both of its ends, and through which the water, pumped up, is intended to stream; the pipe (7) is designed in that way at its upper end that the water stream through the mentioned pipe end can be controlled so that it is directed towards the string bag intended for fish-breeding.
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