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Euthynnus affinis  (Cantor, 1849)

Kawakawa
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Euthynnus affinis
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Australia country information

Common names: Bonito, Little tuna, Mackerel tuna
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: commercial | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Also Ref. 13465.
National Checklist:
Country Information: httpss://www.cia.gov/library/publications/resources/the-world-factbook/geos/as.html
National Fisheries Authority: https://www.csiro.au/
Occurrences: Occurrences Point map
Main Ref: Collette, B.B. and C.E. Nauen, 1983
National Database:

Classification / Names

Actinopterygii (ray-finned fishes) > Perciformes (Perch-likes) > Scombridae (Mackerels, tunas, bonitos) > Scombrinae
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL

Common names from other countries

Main reference

Size / Weight / Age

Max length : 100.0 cm FL male/unsexed; (Ref. 168); common length : 60.0 cm FL male/unsexed; (Ref. 168); max. published weight: 14.0 kg (Ref. 30874)

Length at first maturity
Lm ?, range 40 - 65 cm

Environment

Marine; pelagic-neritic; oceanodromous (Ref. 51243); depth range 0 - 200 m (Ref. 54439)

Climate / Range

Tropical; 18°C - 29°C (Ref. 168), preferred 28°C (Ref. 107945); 35°N - 38°S, 32°E - 137°W (Ref. 54439)

Distribution

Indo-West Pacific: in warm waters including oceanic islands and archipelagos. A few stray specimens have been collected in the Eastern Central Pacific. Highly migratory species, Annex I of the 1982 Convention on the Law of the Sea (Ref. 26139).
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 10 - 15; Dorsal soft rays (total): 11-15; Anal spines: 0; Anal soft rays: 11 - 15; Vertebrae: 39. Swim bladder absent. No trace of vertebral protuberances. Anterior spines of first dorsal fin much higher than those mid-way. Interpelvic process small and bifid. Body naked except for corselet and lateral line. Posterior portion of the back with a pattern of broken oblique stripes.

Biology     Glossary (e.g. epibenthic)

Occurs in open waters but always remains close to the shoreline. The young may enter bays and harbors. Forms multi-species schools by size with other scombrid species comprising from 100 to over 5,000 individuals. A highly opportunistic predator feeding indiscriminately on small fishes, especially on clupeoids and atherinids; also on squids, crustaceans and zooplankton (Ref. 9684). Generally marketed canned and frozen; also utilized dried, salted, smoked (Ref. 9684) and fresh (Ref. 9987).

IUCN Red List Status (Ref. 115185)

Threat to humans

  Reports of ciguatera poisoning (Ref. 30911)



Human uses

Fisheries: highly commercial; gamefish: yes

More information

Age/Size
Growth
Length-weight
Length-length
Length-frequencies
Morphometrics
Morphology
Larvae
Larval dynamics
Recruitment
Abundance
References
Aquaculture
Aquaculture profile
Strains
Genetics
Allele frequencies
Heritability
Diseases
Processing
Mass conversion
Collaborators
Pictures
Stamps, Coins
Sounds
Ciguatera
Speed
Swim. type
Gill area
Otoliths
Brains
Vision

Tools

Special reports

Download XML

Internet sources

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805)
PD50 = 0.6250 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Trophic Level (Ref. 69278)
4.5   ±0.0 se; Based on diet studies.

Resilience (Ref. 69278)
Medium, minimum population doubling time 1.4 - 4.4 years (K=0.4-0.5; tm=3; Fec=210,000)

Vulnerability (Ref. 59153)
Moderate vulnerability (37 of 100)
Price category (Ref. 80766)
Medium