Slender tuna

Slender tuna
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Scombriformes
Family: Scombridae
Subfamily: Scombrinae
Tribe: Thunnini
Genus: Allothunnus
Species:
A. fallai
Binomial name
Allothunnus fallai
Serventy, 1948
Synonyms[2]

Gasterochisma fallai (Serventy, 1948)

The slender tuna, Allothunnus fallai, is a species of tuna, the only species in the genus Allothunnus, found around the world in the southern oceans between latitudes 20° and 50° South, although there are two records of probable vagrants, one in Los Angeles Harbour and the other from the North Pacific subarctic gyre.[1] It has a more elongated body than other species of tuna with which it is symaptric such as the albacore The colour is blue-black on the back with silvery greyish-white sides, however some individuals have a coppery sheen soon after capture. It has a small second dorsal and anal fins resembling a small albacore, but the slender tuna lacks the long sweeping pectoral fins characteristic of albacores.[3] The pectoral fins and pelvic fins are purple on their distal portions and black near their bases.[4] Its length is up to 1 metre (3.3 ft)[2] and it can weigh up to 12 kilograms (26 lb).[3] It occasionally forms schools and its main prey is krill but it is also known to prey on squid and smaller fishes,[2] such as jack mackerel.[5] It is a species of minor commercial importance, taken mainly as bycatch by fisheries for other tuna species.[1] It has rather oily flesh, paler than that of other tuna, but the flesh is palatable when cooked,[2] although it is suitable for canning.[4] The high oil content of the flesh is caused by the oily nature of its diet and varies over the tuna's life, fish which have just fed are high in oil but specimens caught at the end of their migrations will have relatively low oil content. The high concentration of omega-3 polyunsaturated fatty acids in the flesh of this species caused the CSIRO to declare that the slender tuna was Australia's healthiest seafood dish.[5]

References

  1. ^ a b c Collette, B.; Amorim, A.F.; Boustany, A.; et al. (2011). "Allothunnus fallai". The IUCN Red List of Threatened Species. 2011: e.T170349A6761139. doi:10.2305/IUCN.UK.2011-2.RLTS.T170349A6761139.en.
  2. ^ a b c d Froese, Rainer; Pauly, Daniel (eds.). "Allothunnus fallai". FishBase. February 2018 version.
  3. ^ a b Gary Wilson (2 April 2017). Alan Burgess (ed.). "Slender Tuna – Allothunnus fallai". New Zealand Sea Fishes. fishingmag.co.nz. Retrieved 7 May 2018.
  4. ^ a b Dianne J. Bray; S. Schultz (eds.). "Slender Tuna, Allothunnus fallai Serventy 1948". Fishes of Australia. Museums Victoria. Retrieved 7 May 2018.
  5. ^ a b Andrew Darby (14 May 2002). "Slender tuna surfaces with the good oil". The Age. Retrieved 7 May 2018.
  • Tony Ayling & Geoffrey Cox, Collins Guide to the Sea Fishes of New Zealand, (William Collins Publishers Ltd, Auckland, New Zealand 1982) ISBN 0-00-216987-8


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