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electric catfish
Electric catfish is the common name for the catfish (order Siluriformes) family Malapteruridae. This family includes two genera, ''Malapterurus'' and ''Paradoxoglanis'' with 19 species. Several species of this family have the ability to produce an electric shock of up to 350 volts using electroplaques of an electric organ.〔 Electric catfish are found in tropical Africa and the Nile River.〔 Electric catfish are usually nocturnal and feed primarily on other fish, incapacitating their prey with electric discharges.〔 They can grow up to 1 m long.
==Description==
The Malapteruridae are the only group of catfish with well-developed electrogenic organs; however, electroreceptive systems are widespread in catfishes.〔 The electrogenic organ is derived from anterior body musculature and lines the body cavity. Electric catfish do not have dorsal fins or fin spines. They have three pairs of barbels (the nasal pair is absent).〔 The swim bladder has elongate posterior chambers, two chambers in ''Malapterurus'' and three in ''Paradoxoglanis''.〔
''Malapterurus'' is one of the few electric genera to have been conditioned by means of reward to discharge on signal. As reported in the New York Times, April 2, 1967, a researcher, Dr. Frank J. Mandriota of City College, NY, conditioned an ''M. electricus ''to discharge on a light signal for a reward of live worms delivered automatically. This is the first conditioning that modified neither glandular nor muscular responses.
They can grow as large as 100 cm (39 in) SL and about 20 kg (44 lb) in weight.〔 All ''Paradoxoglanis'' species are much smaller.〔 Most malapterurids are dwarf species less than 30 cm (12 in) long.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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