Abstract: A copolymer obtainable by polymerization of a) at least one compound of the formula (I) (monomer ?) where R1 and R2, independently of one another, are in each case H or CH3, R3 is C6-C10-aryl or C7-C12-aralkyl which can carry one or more identical or different C1-C9-alkyl and/or C1-C5-alkoxy substituents, and n is an integer from 0 to 100, b) at least one compound chosen from the group of N-vinylamides, N-vinyllactams, N-vinylimines and N-vinylamines with 2 to 15 carbon atoms (monomer ?), c) if appropriate one or more different difunctional crosslinker components and d) if appropriate one or more different regulators and e) if appropriate one or more further copolymerizable components (monomer ?) is useful for increasing the systemicity of a pesticide.

Abstract: A method of reducing the level of bacteria and viruses in a volume of water during aquaculture comprises:—(a) providing the volume of water to be stocked with farmed aquatic organisms or eggs thereof; (b) prior to the stocking, introducing into the water an aqueous solution of glutaraldehyde in an amount such as to provide in the water from 0.1 to 2 ppm of glutaraldehyde; (c) stocking the water with the farmed aquatic organisms or eggs thereof at a time when the concentration of glutaraldehyde is 0.1 to 2 ppm. (d) allowing the farmed aquatic organisms or eggs thereof to grow; and (e) optionally during a period of the growth, introducing into the water at least one further portion of an aqueous solution of glutaraldehyde in an amount such as to maintain the concentration of the glutaraldehyde at 0.1 to 2 ppm.

Abstract: A method of reducing the level of bacteria and viruses in a volume of water during aquaculture comprises: (a) providing the volume of water to be stocked with farmed aquatic organisms or eggs thereof; (b) prior to the stocking, introducing into the water an aqueous solution of glutaraldehyde in an amount such as to provide in the water from 0.1 to 2 ppm of glutaraldehyde; (c) stocking the water with the farmed aquatic organisms or eggs thereof at a time when the concentration of glutaraldehyde is 0.1 to 2 ppm. (d) allowing the farmed aquatic organisms or eggs thereof to grow; and (e) optionally during a period of the growth, introducing into the water at least one further portion of an aqueous solution of glutaraldehyde in an amount such as to maintain the concentration of the glutaraldehyde at 0.1 to 2 ppm.