Tiger trout

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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). The name derives from the pronounced vermiculations, evoking the stripes of a tiger. It is a rare phenomenon in the wild, with the brook trout having 84 chromosomes and the brown trout 80.[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%.[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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[edit] 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.

[edit] External links

[edit] See also

Splake

[edit] Footnotes

  1. ^ Mark A. Nale When a Trout is a Tiger! Pennsylvania Council of Trout Unlimited. Retrieved 11 September 2006
  2. ^ Salmo x Salvelinus trutta x fontinalis USGS Nonindigenous Aquatic Species database. Retrieved 11 September 2006
  3. ^ Thousands of tigers released in Utah (trout that is!) Utah Division of Wildlife Resources, 24 May 2005. Retrieved 11 September 2006
  4. ^ Watch out, Utah chubs: Tiger trout placed in Scofield Reservoir Utah Division of Wildlife Resources, 24 May 2005. Retrieved 11 September 2006
  5. ^ Tiger Trout & Hybrids Pennsylvania Fish & Boat Commission. Retrieved 11 September 2006
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