Snakehead (fish) |
| Genera |
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| Channa Parachanna |
A family with two genera (Asia: Channa, Africa: Parachanna) which consists of 30 scientific valid species of freshwater fish. The predatory fish is distinguished by a long dorsal fin, small head with large head scales on top, large mouth and teeth. One of its main features is its physiological necessity to breath atmospheric air. It does so with its suprabranchial organ which is a primitive form of a labyrinth organ. In both continents, they are considered a valuable food fish. Larger species like Channa striata, Channa maculata or Parachanna obscura are breed in aqua cultures. The snakehead feeds on plankton, aquatic insects, and mollusks when small. When an adult, it mostly feeds on other fish or frogs. In rare cases, small mammals such as rats are taken. The size of the snakehead species differs greatly. So-called dwarf snakeheads like Channa gachua grow to 10 inch maximum. Most snakeheads grow up to 2 or 3 ft.. Only two species (Channa marulius and Channa micropeltes) can reach a length of more than 1 meter and a weight of more than 6 kilograms.
Snakeheads are also sold as pets.
Snakeheads prompting fears that it could become an invasive species and cause ecological damage.
Snakehead fish became infamous in the US because of their appearance in a pond in Crofton, Maryland (2002). They are prohibited in several other countries like Australia because their introduction to new ecosystems may displace indigenous species. Humans have been introducing snakeheads to non-indigenous waters for over 100 years. In parts of Asia and Africa, the snakehead is considered a valuable food fish and is produced in aquacultures. Due to this fact it was introduced either on purpose (fisheries motivation) or by ignorance (as was the case in Crofton).
Some examples of the introduction of snakeheads to non-indigeneous waters include:
A comprehensive work on the dangers of the introduction of snakeheads to non-indigeneous waters is the work of Prof. W. Courtenay.
On October 9, 2004 a fisherman caught one in Lake Michigan at Burnham Harbor in Chicago, Illinois. In July 2005 a snakehead was spotted in the waters of Flushing Meadows Park in Queens, New York City. They have also been spotted in Washington, California, Texas, Alabama, Florida, North Carolina, Virginia, Rhode Island, Maine, Massachusetts, and Pennsylvania.
When the process begins, officials will apply the herbicides diquat dibromide and glyphosate (tradenames such as Roundup, Rodeo) to the pond to eliminate aquatic vegetation. These chemicals cause oxygen levels to drop, and a subsequent fish kill occurs. The herbicides are sprayed on and into the water from boats.
Approximately one to two weeks after the application of the herbicides, application of the piscicide Rotenone eliminates remaining fish. Dead fish are removed daily; however, unpleasant odors from decaying organic material are to be expected. Like the herbicides, Rotenone will be sprayed on and into the water from boats.
http://www.biodiversitypartners.org/state/fl/snakehead.shtml
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http://www.biodiversitypartners.org/state/fl/snakehead.shtml. The most prominent ones are:. Like the herbicides, Rotenone will be sprayed on and into the water from boats. Open is applied to open (as in anybody, amateur or professional, American or non-Americans can compete) United States national championships in a particular sport. Dead fish are removed daily; however, unpleasant odors from decaying organic material are to be expected. The term U.S. Approximately one to two weeks after the application of the herbicides, application of the piscicide Rotenone eliminates remaining fish. Open (pool). The herbicides are sprayed on and into the water from boats. U.S. These chemicals cause oxygen levels to drop, and a subsequent fish kill occurs. Women's Open (golf). When the process begins, officials will apply the herbicides diquat dibromide and glyphosate (tradenames such as Roundup, Rodeo) to the pond to eliminate aquatic vegetation. U.S. They have also been spotted in Washington, California, Texas, Alabama, Florida, North Carolina, Virginia, Rhode Island, Maine, Massachusetts, and Pennsylvania. Open (golf). In July 2005 a snakehead was spotted in the waters of Flushing Meadows Park in Queens, New York City. U.S. On October 9, 2004 a fisherman caught one in Lake Michigan at Burnham Harbor in Chicago, Illinois. Open (tennis). Courtenay. U.S. W. A comprehensive work on the dangers of the introduction of snakeheads to non-indigeneous waters is the work of Prof. Some examples of the introduction of snakeheads to non-indigeneous waters include:. Due to this fact it was introduced either on purpose (fisheries motivation) or by ignorance (as was the case in Crofton). In parts of Asia and Africa, the snakehead is considered a valuable food fish and is produced in aquacultures. Humans have been introducing snakeheads to non-indigenous waters for over 100 years. They are prohibited in several other countries like Australia because their introduction to new ecosystems may displace indigenous species. Snakehead fish became infamous in the US because of their appearance in a pond in Crofton, Maryland (2002). Snakeheads prompting fears that it could become an invasive species and cause ecological damage. . Snakeheads are also sold as pets. Only two species (Channa marulius and Channa micropeltes) can reach a length of more than 1 meter and a weight of more than 6 kilograms. Most snakeheads grow up to 2 or 3 ft. So-called dwarf snakeheads like Channa gachua grow to 10 inch maximum. The size of the snakehead species differs greatly. In rare cases, small mammals such as rats are taken. When an adult, it mostly feeds on other fish or frogs. The snakehead feeds on plankton, aquatic insects, and mollusks when small. Larger species like Channa striata, Channa maculata or Parachanna obscura are breed in aqua cultures. In both continents, they are considered a valuable food fish. It does so with its suprabranchial organ which is a primitive form of a labyrinth organ. One of its main features is its physiological necessity to breath atmospheric air. The predatory fish is distinguished by a long dorsal fin, small head with large head scales on top, large mouth and teeth. A family with two genera (Asia: Channa, Africa: Parachanna) which consists of 30 scientific valid species of freshwater fish. Student writes article on Snakehead problem in Florida. ITIS entry. Overview of Northern Snakehead biology. snakeheads.org world's largest website for snakeheads. Its introduction to Czechoslovakia by the government in the 1960s failed due to cold winters. It was introduced to Japan about 100 years ago due to fisheries motivations. Channa argus, which is native to northern China (Amur River), was introduced to Central Asia (Kazakhstan, Turkmenistan, Uzbekistan). In this case the origin and reason of the introduction is unknown, but most probably due to human intervention. Channa asiatica, which is native to southern China, was introduced to Taiwan and to southern Japan. In Fiji, the introduction failed. Channa striata was introduced to islands east of the Wallace line by governmental programs in the later half of the 20th century. It can still be found there today. Channa maculata was introduced to Madagascar and to Hawaii around the end of the 19th century. |