The invention concerns a device that is a cultivation tank for aquatic organisms.
Fish tanks are presently either made of plastic, steel, or concrete in a number of designs. The removal of excess feed, excrement and the like is usually done by emptying large volumes of water from the tank to allow technical staff to brush the bottom of the tank clean. If the water outlet and supply is forced to flow by means of a current, there is a better degree of self-cleaning. This however requires considerable amounts of water to be supplied.
Marine fish larva such as cod, turbot, halibut and plaice are too sensitive for such strong water current. Thus the cleaning of tanks for these species has to be done manually by technical staff vacuuming the bottom with a syphon that has a suitable nozzle fitted to the end. This operation is excessively time consuming. In cases where the water is recirculated it is disadvantageous to have a strong water current flowing through the tank.