protandry
Form of sequential hermaphroditism in which male offspring become female at some point during their life cycle.
Results for “cycling”
Ichthyological terms, not general ones.
protogyny
Form of sequential hermaphroditism in which female offspring become male at some point during their life cycle.
undergravel filter
A filter which works by drawing water down through the substrate, where the cycle bacteria colonies are located, before returning it to the aquarium. Difficult to keep clean and now considered old fashioned.
worms (parasite)
Any species of nematode worm which spends part of its life cycle as an internal parasite within a fish's intestinal system.