Bothragonus swanii, Rockhead

Bothragonus swanii (Steindachner, 1876)

Rockhead
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Bothragonus swanii   AquaMaps   Data sources: GBIF OBIS
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Bothragonus swanii
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Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Scorpaeniformes (Scorpionfishes and flatheads) > Agonidae (Poachers) > Bothragoninae
Etymology: Bothragonus: Greek, bostrykos = cure of lack of hair + Greek, gono = birth (Ref. 45335);  swanii: Named after James G. Swan of Port Townsend, Washington (Ref. 6885).  More on author: Steindachner.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; demersal; depth range 0 - 18 m (Ref. 2850).   Temperate; 60°N - 35°N, 155°W - 121°W

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Eastern Pacific: Kodiak Island, Alaska to Carmel Bay, Monterey County, California, USA (southernmost range confirmed by J.R. Wolfe, pers. comm. 09/02).

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 8.9 cm TL male/unsexed; (Ref. 2850)

Short description Morphology | Morphometrics

Dorsal spines (total): 2 - 5; Dorsal soft rays (total): 4-5; Anal spines: 0; Anal soft rays: 4 - 5; Vertebrae: 32. Dorsal fins small; caudal fin rounded; pectoral fins large, supported well out from sides of body; pelvic fins very narrow and rays appear fused (Ref. 6885). Color very variable, depending on background; brown with dark bars, orange with bluish bars, or scarlet with brown bars (Ref. 6885).

Biology     Glossary (e.g. epibenthic)

Inhabits intertidal areas and to 18 m depth (Ref. 2850). Frequently caught in tide pools (Ref. 28197). Its food consists mainly of tiny crustaceans (shrimp and crab-like creatures) which are picked from the bottom or very close to it (Ref. 4930). Demersal spawner in nearshore habitats (Ref. 56049).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Demersal spawners.

Main reference Upload your references | References | Coordinator | Collaborators

Kanayama, T., 1991. Taxonomy and phylogeny of the family Agonidae (Pisces: Scorpaenifomes). Mem. Fac. Fish. Hokkaido Univ. (38)1-2:1-199. (Ref. 28197)

IUCN Red List Status (Ref. 123251)

  Not Evaluated 

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

FAO(Publication : search) | FishSource |

More information

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Summary page | Point data | Common names | Photos

Internet sources

Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | ECOTOX | Faunafri | Fishtrace | GenBank(genome, nucleotide) | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Tree of Life | Wikipedia(Go, Search) | World Records Freshwater Fishing | Zoological Record

Estimates based on models

Preferred temperature (Ref. 115969): 8.4 - 12.8, mean 9.8 °C (based on 177 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.7500   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
Trophic level (Ref. 69278):  3.6   ±0.59 se; based on food items.
Resilience (Ref. 120179):  High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153):  Low vulnerability (20 of 100) .