killifish


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killifish,

any of more than a thousand species of small fish of the several families of the order Cyprinodontiformes (toothed minnows or toothed carps), a group that includes also the topminnows and many popular aquarium fishes (e.g., the guppy or rainbow fish, Poecilia reticulata) among its brightly colored tropical species. Most North American toothed minnows are oviparous, i.e., bearing young hatched from eggs, and some are quite colorful; however, the tropical viviparous species (i.e., bearing live young) are preferred for aquariums, since they are easier to raise. Killifishes average from 2 to 4 in. (5–10 cm) in length and have compressed bodies, small mouths with projecting lower jaws, unforked tails, and large scales. They live in ponds, streams, ditches, and salt marshes throughout the United States and feed on insect larvae, crustaceans, and small water plants. The banded killifish is found in the Mississippi basin; the common killifish (5 in./12.5 cm) is an eastern species. Guppies can survive temperatures of up to 100°F; (38°C;) as can certain topminnows of the W United States. The greenish-gray female guppy (1 1-2 in./3.75 cm) produces from 12 to 25 live offspring every few weeks; in captivity they must be separated from the cannibalistic adults. The rainbow colors of the male guppy (1 in./2.5 cm) are marked with black spots and bars. Like the guppy, the 2-in. (5-cm) Gambusia, a topminnow of the S Atlantic and the Gulf, bears live young and is important in controlling mosquitoes, on whose larvae both the guppy and the minnow feed. Killifishes are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Actinopterygii, order Cyprinodontiformes.
References in periodicals archive ?
Looking at the genetic analyses of the nearly 400 Atlantic killifish, researchers surmised the fish already carried the genetic variation that allowed them to adapt to the toxicity, even before the sites they were collected from were polluted.
Genetic variation at aryl hydrocarbon receptor (AHR) loci in populations of Atlantic killifish (Fundulus heteroclitus) inhabiting polluted and reference habitats.
Expression of aquaporin 3 in gills of the Atlantic killifish (Fundulus heteroclitus): effects of seawater acclimation.
Teleostei: Cyprinodontiformes: Rivulidae): a new annual killifish from the Mirim Lagoon basin, southern Brazil.
Also known as Desert Killifish, this tiny fish has become an eco-friendly and economical tool for the civic body's Pest Control Department in combating mosquito larvae that breed in irrigation basins and water bodies in different areas across the emirate.
Northern studfish, Blackstripe topminnow, Banded killifish, Food habits, Diet overlap
9:00 MYOGLOBIN CONTENT IN VENTRICLES OF MANGROVE KILLIFISH (KRYPTOLEBIAS MARMORATUS) DURING EMERSION **.
nebulosus (Johnson & Seaman 1986), striped killifish Fundulus majalis (Abraham 1985), M.
The wet jeans and muddy faces couldn't hide the big smiles on the girls' faces, and the nets and traps yielded a school of mummichogs, small killifish whose name means "goes in crowds.
Salts of lead, copper, mercury, beryllium, cadmium, and silver have a detrimental effect on liver enzymes in the killifish (Jackim et al.
Biologists have identified a new species of killifish, four centimetres in length, in the waters, while those water buffalo-originally introduced 130 years ago by Chechen families who had migrated from Russia--help to stop vegetation choking off the open water.
In Delaware, we use small tidal minnows, known as killifish or 'bull minnows.