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The Tuna - Wanted Poster


Characteristics

Surname: Tuna
Latin name: Thunnus
class: Fishes
size: 0.5 - 5m
mass: up to 700kg
Older: 10 - 35 years
Appearance: silver scales
Sexual dimorphism: No
Nutrition typePhotos: Fish eater (piscivor)
food: Grouper, mackerel, sardines, herring, crustaceans
distribution: worldwide
original origin: unknown
Sleep-wake rhythm: ?
habitat: Sea, ocean
natural enemies: Shark, whale
sexual maturity: about the age of five
mating season: ?
oviposition: up to 10,000,000 eggs
social behavior: Swarmfish
Threatened with extinction: No
Further profiles of animals can be found in the Encyclopaedia.

Interesting facts about the tuna

  • Tunas or Thunnus describe a total of eight species of fish within mackerel.
  • Tuna are native to the oceans and seas of all climatic zones except polar areas.
  • They live in coastal areas as well as in the open sea, where they can be found in water depths of up to a thousand meters.
  • However, tuna fish prefer mild temperatures of at least ten degrees Celsius, and thus, especially in warmer areas just below the water surface. The largest populations are found on the coasts of Central and South America, around China and Japan, in the Indian Ocean and in the Mediterranean.
  • Nearly all types of tuna are now considered endangered due to global overfishing. In recent decades, stocks worldwide have fallen by almost ninety percent, a trend that will continue in the future.
  • Tuna are extremely fast swimmers that can reach speeds of up to eighty kilometers per hour. They owe this to their spindle-shaped slim physique and up to twelve pairs of tassels, which are located between the dorsal and caudal fin on the upper and lower sides. These allow the tuna to consistently avoid eddies during fast locomotion.
  • With a body length of up to five meters, the red tuna is considered the largest member of this genus. The white tuna reaches a length of up to 1.40 meters. Depending on the species, tuna fish can weigh up to seven hundred kilograms.
  • Tunas join together to form small flocks and cover several thousand kilometers every year as part of their hikes. Scientists observed marked migratory routes from the Bahamas to Norway and Iceland.
  • The tuna is a predatory hunter that primarily feeds on smaller shoaling fish such as sardines or mackerel, as well as small perches and lingers, herring, cuttlefish and crabs.
  • All species prefer certain spawning areas, where they meet each year at a fixed time. Depending on the species, the females can produce up to several million eggs per season, which they release to the open water.
  • The only a few millimeters larvae hatch after a few days. After a few weeks the juvenile fish are already several centimeters tall.
  • Because of their impressive size, tuna are very rarely sacrificed to other predatory fish. In addition to humans, their enemies include only large sharks, swordfish and toothed whales.
  • Depending on the country's cuisine, tunas are cooked as raw or roasted fish, as well as canned and fish pastes.