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Definitions - K

Kalkwasser	literally, "chalk water," German for limewater, a solution of calcium hydroxide added to marine reef aquariums as a source of calcium ions

KH	"German hardness," a scale of measurement of alkalinity or carbonate hardness

Killifish	egg-laying fish in the Families Cyprinodontidae, Fundulidae, and Rivulidae, from temperate, tropical, and subtropical areas of North AMerica, South America, and Africa; they are the focus of interest for a substantial number of specialized aquarium hobbists

Kinorhynch	marine invertebrates, microscopic in size or nearly so, that are a component of the fauna of live sand and live rock

Koi	the common carp, Cyprinis carpio, cultivated for centuries in theFar East and more recently in Europe and the Western Hemisphere in garden ponds; they are notable for their vivid color patterns

Krill	any euphausid crustacean, but often Euphausia superba, harvested from the sea and sold in frozen or freeze-dried form as a food for aquarium fish