Fish migration the moving behavior developed of many fish types is called, which makes it for them possible to use different habitats optimally. For the reproduction about different factors are such as current, temperature, oxygen content of importance as for buildup or nutrition. Therefore fish - similar the migratory birds - move within connected water systems, in order to find the optimal conditions for the respective needs.

Most river fish types domestic in Europe are dependent on such migrations; above all the kinds, which accomplish Laichwanderungen, depend on the unanimity of their river and its cross-linking with all necessary partial habitats.

Most well-known example of the fish migration is probably the migration of the salmon, which pull for reproduction in large crowds from the sea into the upper runs of the rivers, abzulaichen over there. The salmon put enormous distances of many hundred kilometers back.

In the past decades by the science a dramatic decrease of the populations is determined by some - above all more laichwandernder - fish types. This development is attributed among other things to transverse sheetings such as river-run power plants, weirs into the upper run and the

The ecological example of an intact current landscape demands therefore the unhindered-biological constantness of the rivers, the so-called running waters continuum. To through-swim that is, that moving fish types must have the possibility, the running waters from the delta to the source including Since pilot weirs by moving fish not to be overcome not to be able, the blockade of the moving ways must over well working evasions, so-called fish ascent plants ("fish stairs ") is moderated.

These require founded knowledge over the moving behavior of the kinds as well as over their behavior patterns and orientation possibilities within the range of such obstacles. A comprehensive study of the fish migration, for example by monitorings by fish weirs is therefore a substantial component of the kind preservation of innumerable fish.

Articles in category "Fish migration"

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