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| naked-back knifefishes | ||||||||||
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Electrophorus |
The naked-back knifefishes are a family (Gymnotidae) of knifefishes that do not have a dorsal fin. They are found only in freshwaters of Central America and South America. All have organs adapted to the exploitation of bioelectricity.
The family is small, with just 19 species in two genera. The sole member of Electrophorus is the electric eel, while Gymnotus includes some of the most abundant knifefish found in the Amazon.
The Gymnotus knifefishes live in the leaf litter along river banks, in root mats, and in flooded meadows. They are nocturnal predatorThis snapping turtle is trying to make a mealof a Canada goose, but the goose is too wary. A predator is an animal or other organism that hunts and kills other organisms for food in an act called predation . Most predators are carnivores. Some predators as feeding on insectSubclass Apterygota Symphypleona globular springtails Subclass Archaeognatha (jumping bristletails) Subclass Dicondylia Monura extinct Thysanura (common bristletails) Subclass Pterygota Palaeodictyoptera extinct Ephemeroptera (mayflies) Odonata ( dragonfls, crustaceanCrustaceans Hyalella azteca Scientific classification Kingdom: Animalia Phylum: Arthropoda Subphylum Crustacea Classes Remipedia Cephalocarida Branchiopoda Ostracoda Maxillopoda Malacostraca The crustaceans (Crustacea) are a large group of arthropods (55,s, and other fishAtlantic herring, Clupea harengus one of the most abundant species in the world Photo A fish is a poikilothermic (cold-blooded) water-dwelling vertebrate with gills. There are over 27,000 species of fish, making them the most diverse group of vertebrates.. They generate weak electric fieldIn physics, an electric field is an effect produced by an electric charge that exerts a force on charged objects in its vicinity. Definition and derivation The mathematical definition of the electric field is developed as follows. Coulomb's law gives thes that are still under study, but seem to be used in locating objects and possibly for communication.
Genus Electrophorus:
Genus Gymnotus: