Abstract: A feeding apparatus includes an inner compartment having a first opening; and an outer compartment having a second opening. At least one of the inner compartment and the outer compartment is configured to be movable relative to the other one of the inner compartment and the outer compartment from a first position in which the first opening is out of alignment with the second opening to a second position in which the first opening is aligned with the second opening.

Abstract: The invention describes novel preparations and their use for reducing the acute damaging effect of ammonia in organisms living in the keeping water of aquariums, garden ponds, or aquaculture systems. The preparations consist of adducts of sodium hydrogen sulfite at an aliphatic aldehyde of the general formula X—(CH2)n—CO—H, wherein n means the numbers 0 to 3, and X means an —OH, —COOH, or —CO—H group, wherein X cannot be —OH, if n=0. The preparations are used in the keeping water with a concentration of 10 to 140 mg/l.

Abstract: The invention describes novel preparations and their use for reducing the acute damaging effect of ammonia in organisms living in the keeping water of aquariums, garden ponds, or aquaculture systems. The preparations consist of adducts of sodium hydrogen sulfite at an aliphatic aldehyde of the general formula X—(CH2)n—CO—H, wherein n means the numbers 0 to 3, and X means an —OH, —COOH, or —CO—H group, wherein X cannot be —OH, if n=0. The preparations are used the keeping water with a concentration of 10 to mg/l.

Abstract: The invention describes novel agents und methods thereof for removing chloramine, chlorine, and other active chlorine compounds from water used for keeping organisms living in aquariums, garden ponds, or other aquaculture systems. The agents consist of sodium hydrogen sulfite, salts and organic derivatives thereof, or adducts of sodium hydrogen sulfite, preferably an adduct of aliphatic aldehydes of the general formula X—(CH2)n—CO—H, wherein n means the numbers 0 to 3 and X means a —OH, —COOH or —CO—H group, wherein X may not be —OH if n=0.

Abstract: The invention relates to agents for the removal or reduction of inorganic nitrogen compounds, especially nitrate, from biological aquarium waters, containing a biologically degradable polymer, preferably polycaprolactone (PCL) and to the utilization of said agents.

Abstract: The invention relates to feedstuff for aquatic animals, which contains at least two feed mixes of different composition in single-piece units and which is characterized in that the single-piece units comprise at least two contiguous and merging zones that contain the feed mixes separately from each other. Most preferably, the feedstuff consists of bi- or multicolored feedstuff flakes that contain different feed mixes or drugs in individual separate zones. The invention also relates to a method for producing the feedstuff. The flakes prevent the aquatic animals from selective feeding and allow the simple adjustment of a desired density and speed of descent.