Rainbow trout

maximum Length observed: 120 cm for the male.
maximum Weight observed: 25 kg.
maximum Longevity observed: 11 years.

It is about common trout of the North-American sub-continent. Its genetic differentiation of with European common trout (the Trout fario) was done at the time of the continental drift.

Its introduction into the European biotopes has an unfavourable impact on watery fauna: it enters in competition with the Truite fario on the same ecological niches. But although generally not reproducing in the lakes and European rivers, its behavior (more gregarious) and its dietary habits (rate of higher annual enlargement) do of them one of the causes of the fall of manpower of the Truite fario in Europe (of the years of uncontrolled discharges in our lakes and rivers).

In its biotope of origin, it reproduces naturally out of interstitial water as soon as the female reaches a size of about thirty centimetres. In Europe, the conditions of a natural reproduction are not met. It is however difficult to affirm that this species will never reproduce in the European rivers. This anomaly is explained partially of the facts why the period of abrasion of the rainbow trout coincides with the period of opening of the fishing of salmonidés, that the introduced fish, resulting from piscicultures, are of modest size, known as “the portion” is 23 to 24 centimetres (they will seldom reach 30 centimetres before being captured) and that they were not selected for the reproduction.

With less selective dietary habits (rate of higher annual enlargement) and a better resistance to water of bad quality, the rainbow trout is armed better than the species autochtones to face the slow qualitative degradation of the rivers.

The fish being particularly combative, he is sought by the sporting fishermen who appreciate his fishing, in No-kill most of the time and except normal season of fishing (introduction into the " water closes").

Its surface of distribution is limited normally to the North-American sub-continent: South America, having its own fish autochtones, has trouts in its rivers only recently. The sporting fishermen of all continents having carried out poisonings, one finds in South America Oncorhynchus mykiss (which was poured by the North-Americans) and, especially, Salmo trutta fario poured primarily by French emigrants originating in the the Limousin and Basque Country (the two species besides adapted remarkably well to their new environment).

See too

External references

Simple: Rainbow Trout

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