killifish
Noun: 1. A small, often brightly colored, freshwater or brackish water fish belonging to the family Cyprinodontidae (order Cyprinodontiformes). They are characterized by their egg-laying habits and are popular in aquariums. Some species are also used for biological mosquito control. 2. Any of various similar small fish.
The word "killifish" is used to refer to the fish itself, either as an individual or as a species/group. It is a countable noun.
- The biologist studied the breeding behavior of the killifish.
- I added three colorful killifish to my freshwater aquarium.
- Some species of killifish have a very short lifespan.
- Killifish are effective at controlling mosquito populations because they eat the larvae.
- The term is often used in ecological and aquarium hobbyist contexts. In scientific classification, it refers specifically to fish within the families Cyprinodontidae, Fundulidae, Rivulidae, and others within the order Cyprinodontiformes.
- Annual killifish: A specific type of killifish whose life cycle is adapted to temporary pools; the adults die when the pool dries up, and the species survives via drought-resistant eggs.
- Killifishes: The standard plural form.
- Cyprinodont: A more technical term for fish belonging to the order Cyprinodontiformes, which includes killifish, pupfish, and others.
- Topminnow (for some North American species, especially in the genus )
- Pupfish (a closely related group within the same order, often found in similar habitats)
The primary meaning refers to the specific group of small, egg-laying fish popular in aquariums. The secondary, more general meaning can apply to any similar small fish, though this is less common in technical usage. The name "killifish" is thought to come from the Dutch word "kil," meaning a small stream or channel, referring to their typical habitat.
- small mostly marine warm-water carp-like schooling fishes; used as bait or aquarium fishes or in mosquito control