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Freshwater fishes like the electric eel require a high voltage to give a strong shock because freshwater has high resistance; powerful marine electric fishes like the torpedo ray give a shock at much lower voltage but a far higher current. The electric eel produces its strong discharge extremely rapidly, at a rate of as much as 500 Hertz ...
The Piscataqua River (Abenaki: Pskehtekwis) is a 12-mile-long (19 km) tidal river forming the boundary of the U.S. states of New Hampshire and Maine from its origin at the confluence of the Salmon Falls River and Cochecho River to the Atlantic Ocean. The drainage basin of the river is approximately 1,495 square miles (3,870 km 2), including the ...
Usually pulsed direct current (DC) is applied, which causes galvanotaxis in the fish. Galvanotaxis is uncontrolled muscular convulsion that results in the fish swimming towards the anode. Teams of at least two people are recommended for an effective electrofishing crew: one to operate the anode, and the other to catch the stunned fish with a ...
Jeremy Wade in 2011. Jeremy John Wade (born 23 March 1956) is a British television presenter, an author of books on angling, and a biologist. He is known for his television series River Monsters, Mighty Rivers and Dark Waters. He is regarded as one of the most accomplished fishermen of all time, having traveled the world and caught a multitude ...
At its mouth, the Eel River produces an estimated annual runoff of 6.9 million acre-feet (8.5 km 3) per year, or about 9,500 cu ft/s (270 m 3 /s). [4] The Eel's maximum recorded flow of 936,000 cu ft/s (26,500 m 3 /s) on December 23, 1964, was the largest peak discharge of any California river in recorded history, and one of the largest peaks ...
The Atlantic goliath grouper can grow to lengths of 2.5 meters (8.2 feet) and weigh up to 363 kilograms (800 pounds). [9] The species ranges in coloration from brownish yellow to grey to greenish and has small black dots on the head, body and fins. Individuals less than 1 meter (3.3 feet) in length have 3 to 4 faint vertical bars present on ...
A study conducted on captive otters revealed they preferred larger fish, ranging from 15 to 17 centimeters (5.9 to 6.7 in), more than smaller fish, ranging from 8 to 10 centimeters (3.1 to 3.9 in), and they had difficulty catching fish species less than 10 centimeters (3.9 in) or larger than 17 centimeters (6.7 in). [27]
Aquatic locomotion. A great cormorant swimming. Aquatic locomotion or swimming is biologically propelled motion through a liquid medium. The simplest propulsive systems are composed of cilia and flagella. Swimming has evolved a number of times in a range of organisms including arthropods, fish, molluscs, amphibians, reptiles, birds, and mammals.