Nitrogen compounds produced by the metabolism of proteins. The portion of water hardness which caused primarily by sulfates rather than carbonates. The pronounced forehead on certain types of male Cichlids. Flap of skin which protects the gills. A term used in the classification of organisms.
Related families make up an order.
Accounts for water losses through the skin of marine fishes, i.e. to the relatively stronger sea water, which they have to constantly drink to replenish these losses. A tube which, in egg laying species, protrudes from the body during spawning in order to deposit and fertilze the eggs. Producing eggs which hatch inside the body of the female. An oxygen-generating device that supplies the tank water with oxygen produced by a chemical reaction. The starting substance for the reaction is Hydrogen Peroxide, which breaks down into water and oxygen.