In detail

The Rainbow Trout - Wanted Poster


Surname: Rainbow trout
Other names: /
Latin name: Oncorhynchus mykiss
class: Fishes
size: 30 - 90 cm
mass: 1 - 10 kg
Older: 6 - 11 years
Appearance: strongly dependent on the species
Sexual dimorphism: Yes
Nutrition type: Insectivore (insektivor) and fish-eater (piscivor)
food: Insects, worms, fish
distribution: Europe, North America, South America and Australia
original origin: Alaska, Canada, USA, Russia
Sleep-wake rhythm: daylight and dusk active
habitat: prefers cold streams
natural enemies: various predatory fish
sexual maturity: during the second year of life
mating season: December - June (depending on location)
social behavior: Young animals live as a swarm animal, adult trout as a loner
Threatened with extinction: No
Further profiles of animals can be found in the Encyclopaedia.

Interesting facts about the rainbow trout

  • The rainbow trout, or Oncorhynchus mykiss, describes a food fish that is counted among the salmon fish, which depending on its distribution area is subdivided into several subspecies.
  • The rainbow trout owes its name to its iridescent bands in many bright colors that run along both sides of the body.
  • Originally the rainbow trout was located in the northwest of the United States, Canada, Alaska and Russia. Through breeding and naturalization, it is now widespread on all continents and in a total of 45 countries and is considered one of the most common representatives of salmon fish.
  • In some countries of Southern Europe, South America and Australia, naturalization had negative consequences for ecosystems, as local trout species were gradually displaced and rainbow trout play a role in transmitting parasites to other fish species.
  • Depending on the subspecies, rainbow trout can reach body lengths of up to one meter, with an average length of between thirty and fifty centimeters.
  • They usually weigh one or two kilograms. In Europe, however, animals weighing more than ten kilograms have been caught, and some specimens caught in America weighed more than twenty kilograms.
  • The rainbow trout has an elongated body, which appears flattened laterally and is dark, mostly olive green or bluish in color.
  • The ventral side appears much brighter and is whitish on most specimens.
  • The entire body except the fins is littered with tiny black dots.
  • The eponymous lateral band is usually red and shimmering in all the colors of the rainbow.
  • As with all salmon fish, there is a fat fin between the tail and dorsal fin in the rainbow trout.
  • The rainbow trout prefers oxygen-rich rivers with low temperatures. Compared to other types of trout, it places significantly higher demands on the quality of the water. In trout farms with poor water quality, diseases such as the so-called "redmouth disease" can spread very quickly.
  • The rainbow trout likes to stick directly above the ground in the middle of the river and prefers strong currents.
  • Young trout live in swarms, adult specimens are solitary.
  • Wild rainbow trout feed on flying insects, crabs, snails and worms, amphibians and fish. Often rainbow trout, which live in breeding and are fed with fish pellets, consume also conspecifics.
  • The spawning time depends on the water temperature. At six to seven degrees Celsius rainbow trout find ideal breeding conditions.
  • The life expectancy of the rainbow trout is about eleven years.