Euthynnus lineatus

Black skipjack tuna
Euthynnus lineatus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Scombriformes
Family: Scombridae
Genus: Euthynnus
Species:
E. lineatus
Binomial name
Euthynnus lineatus

Euthynnus lineatus, the black skipjack tuna or black skipjack, is a species of ray-finned bony fish in the family Scombridae. It belongs to the tribe Thunnini, better known as the tunas.[2]

Description

E. lineatus has a total of 10-15 spines in its dorsal fins with the anterior spines of the first dorsal fin being much taller than the middle spines which gives this fin a concave outline. The anal fin has 11 - 12 soft rays and it has a vertebra count of 37. Its body is almost entirely scaleless except for the lateral line and a "corselet", and there is no swim bladder. It is generally iridescent blue in colour with black markings on its back made up of 3 to 5 horizontal stripes, as well as a variable amount of black or dark grey spots above the pelvic fins. Occasional specimens have extensive longitudinal stripes of light grey on their belly while other individuals have few or no such markings.[3]

Distribution

Eastern tropical Pacific from San Simeon, California to northern Peru and the Galápagos Islands.[4]

Fisheries

No targeted fishery exists for this species, though it is taken incidentally in the course of other fishery operations.[1]

Biology

E. lineatus is a pelagic and oceanodromous species which is rarely recorded where the surface temperature falls below 23 °C (73 °F). The larvae are most commonly found at temperatures higher than 26 °C (79 °F). It is generally distributed in surface waters which are no more than 386 kilometres (240 miles) from land. E. lineatus will form multi-species schools with yellowfin tuna and skipjack tuna. It shows opportunistic predatory behaviour, sharing its feeding pattern with other tunas, as well as dolphins and other large predatory fish, with which it also competes.[1]

The spawning of this species has a wide geographical and temporal distribution, and in the eastern tropical Pacific it has been shown to occur over a wide area from coastal to oceanic waters.[1]

References

  1. ^ a b c d Collette, B.; Acero, A.; Canales Ramirez, C.; et al. (2011). "Euthynnus lineatus". The IUCN Red List of Threatened Species. 2011: e.T170320A6747016. doi:10.2305/IUCN.UK.2011-2.RLTS.T170320A6747016.en.
  2. ^ "Euthynnus lineatus". Integrated Taxonomic Information System. Retrieved 2 November 2012.
  3. ^ Froese, Rainer; Pauly, Daniel (eds.). "Euthynnus lineatus year-2018". FishBase.
  4. ^ "Scombridae on research.calacademy.org" (PDF). Archived from the original (PDF) on 2010-07-05. Retrieved 2010-08-03.
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