Tetrapturus georgii Lowe, 1841
Roundscale spearfish
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Tetrapturus georgii
Picture by FAO
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Picture by FAO
Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Perciformes (Perch-likes) > Istiophoridae (Billfishes)
Etymology: Tetrapturus: Greek, tetra = four + Greek, pteron, fin, wing (Ref. 45335). More on author: Lowe.
Etymology: Tetrapturus: Greek, tetra = four + Greek, pteron, fin, wing (Ref. 45335). More on author: Lowe.
Environment / Climate / Range Ecology
Marine; pelagic-oceanic; oceanodromous (Ref. 51243); depth range 0 - 200 m (Ref. 43). Subtropical; 45°N - 20°N, 31°W - 11°E (Ref. 43)
Size / Weight / Age
Maturity: Lm ? range ? - ? cm
Max length : 184 cm FL male/unsexed; (Ref. 43); 181.0 cm FL (female); max. published weight: 21.5 kg (Ref. 43); max. published weight: 21.5 kg
Max length : 184 cm FL male/unsexed; (Ref. 43); 181.0 cm FL (female); max. published weight: 21.5 kg (Ref. 43); max. published weight: 21.5 kg
Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions | Faunafri
Eastern Atlantic and Mediterranean Sea: Positively known only from Madeira, Sicily (Italy), Strait of Gibraltar, and the adjacent Atlantic Ocean off southern Portugal. Can be expected to range widely in the eastern and perhaps central North Atlantic. Central and eastern Atlantic records from Japanese longliner's data need clarification. Highly migratory species, Annex I of the 1982 Convention on the Law of the Sea (Ref. 26139).
Further study is strongly needed to clarify the validity of this species. Probably oceanic. Length has been transferred from 'Body length' to FL (* 0.15).
Main reference
Upload your references | References | Coordinator | Collaborators
Nakamura, I., 1985. FAO species catalogue. Vol. 5. Billfishes of the world. An annotated and illustrated catalogue of marlins, sailfishes, spearfishes and swordfishes known to date. FAO Fish. Synop. 125(5):65p. Rome: FAO.
IUCN Red List Status (Ref. 90363)
Threat to humans
Harmless
Human uses
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Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805): PD50 = 0.5630 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00451 (-0.17992 - 0.18895), b=3.13 (3.03 - 3.24), based on LWR estimates for this family-BS (Ref. 93245).
Trophic Level (Ref. 69278): 4.4 ±0.7 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153): Moderate to high vulnerability (46 of 100) .