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In biology, the electric organ is an organ that an electric fish uses to create an electric field. Electric organs are derived from modified muscle or in some cases nerve tissue , called electrocytes, and have evolved at least six times among the elasmobranchs and teleosts .
Active electrolocation is practised by two groups of weakly electric fish, the Gymnotiformes (knifefishes) and the Mormyridae (elephantfishes), and by Gymnarchus niloticus, the African knifefish. An electric fish generates an electric field using an electric organ, modified from muscles in its tail. The field is called weak if it is only enough ...
The main organ is the first electric organ to develop, followed by Sachs' organ and then Hunter's organ. All the electric organs are differentiated by the time the body reaches a length of 23 cm (9.1 in). Electric eels are able to produce electrical discharges when they are as small as 7 cm (2.8 in). [54]
Electric organ discharges are two types, pulse and wave, and vary both by species and by function. Electric fish have evolved many specialised behaviours. The predatory African sharptooth catfish eavesdrops on its weakly electric mormyrid prey to locate it when hunting, driving the prey fish to develop electric signals that are harder to detect.
Knollenorgans are sensitive to electrical stimuli at frequences between 20 hertz and 20 kilohertz, with electric fields as small as 0.1 millivolt per centimetre. They are used to detect the weak electric organ discharges of other electric fish, usually of their own species. [2] [3] [4] [5]
Crab sign on Tamashiro Market. Tamashiro Market is a family-run seafood market located in Downtown Honolulu on North King Street for over 60 years. [1] It was founded by Walter Tamashiro after a tsumani hit Hilo in 1946, where the Tamashiro family previously lived. Fresh fish sales are 75 percent of the market's business. [2]
Electric eels, for example, have three pairs of abdominal organs containing electrolytes that can produce electricity: the main organ, the hunter's organ and the sach's organ. The EOD can be species specific and can even sometimes be unique to each individual. [28] Electric fish can also modify the frequency, amount, duration, silent periods ...
This electric field enables the fish to navigate and find prey as nearby objects distort this field, and it can sense the distortion on its skin. [18] The electric organ is derived from striated muscle in a developmental process which makes the filaments thicker, loses the striations, and creates positive and negative ends of the constituent ...