The tiger trout (Salmo trutta X Salvelinus fontinalis) is a sterile, intergeneric hybrid of the brown trout (Salmo trutta) and the brook trout (Salvelinus fontinalis). In Biology, hybrid has two meanings The first meaning is the result of interbreeding between two animals or plants of different taxa. The brown trout ( Salmo trutta morpha fario and S trutta morpha lacustris) and the sea trout ( S The brook trout, Salvelinus fontinalis, (sometimes called the eastern brook trout, Adirondack coaster lake trout) is a Species of Fish The name derives from the pronounced vermiculations, evoking the stripes of a tiger. The tiger ( Panthera tigris) is a member of the Felidae family the largest and the most powerful of the four " Big cats quot in the Genus It is a rare phenomenon in the wild, with the brook trout having 84 chromosomes and the brown trout 80. A chromosome is an organized structure of DNA and Protein that is found in cells. [1] Records show instances as far back as 1944. [2]
Artificially, tiger trout can be produced reliably enough to be grown by hatcheries. This is done by fertilizing brown trout eggs with brook trout milt, and heat shocking them, which causes creation of an extra set of chromosomes and increases survival from 5% to 85%. In most Birds and Reptiles an egg ( Latin ovum) is the Zygote, resulting from Fertilization of the Ovum. For the alternate meaning of "milt" as "spleen" see Spleen. [3] Tiger trout have been reported to grow faster than natural species,[4] though this assessment is not universal,[5] and they have been widely stocked for sport fishing.
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Tiger trout: domestic vs. wild
Many states have had stocking programs for tiger trout. Wisconsin discontinued its program in the late 1970s. Tigers were exclusively stocked in the Great Lakes. After the stocking program was discontinued, a 20-pound-plus world-record tiger was caught in the Great Lakes.
Wisconsin, however, currently has no stocking program for tigers, but the hybrids show up naturally in the state's small streams. Given that water quality of small streams is the best it has been in 20 years, the brook trout population has boomed in recent years. Thus, more wayward male brook trout have been found around brown trout redds, perhaps accounting for the hybrids.
External links
- http://www.thejump.net/id/tiger-trout.htm
- http://www.fieldandstream.com/fieldstream/photogallery/article/0,13355,1604024,00.html
See also
Footnotes
- ^ Mark A. The splake ( Salvelinus namaycush X Salvelinus fontinalis) is a hybrid of two fish species resulting from the crossing of a male Brook trout ( Salvelinus fontinalis Nale When a Trout is a Tiger! Pennsylvania Council of Trout Unlimited. Retrieved 11 September 2006
- ^ Salmo x Salvelinus trutta x fontinalis USGS Nonindigenous Aquatic Species database. The United States Geological Survey ( USGS) is a scientific agency of the United States government. Retrieved 11 September 2006
- ^ Thousands of tigers released in Utah (trout that is!) Utah Division of Wildlife Resources, 24 May 2005. Retrieved 11 September 2006
- ^ Watch out, Utah chubs: Tiger trout placed in Scofield Reservoir Utah Division of Wildlife Resources, 24 May 2005. Retrieved 11 September 2006
- ^ Tiger Trout & Hybrids Pennsylvania Fish & Boat Commission. Retrieved 11 September 2006
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