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Bothragonus swanii (Steindachner, 1876)
Rockhead
Family: Agonidae
Introduction to the Fish

Photograph

© Aaron Baldwin     (Photo ID #43706)

Map

Source: Distribution of Bothragonus swanii as compiled by Aquamaps

Species Information

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).

Source: FishBase. Kanayama, T. 1991 . (Ref. 28197)

Biology

Species Biology

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). demersal; marine; depth range 0 - 18 m (Ref. 2850). Temperate.

Source: FishBase. Kanayama, T. 1991 . (Ref. 28197)

Distribution

Distribution

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

Source: FishBase. Kanayama, T. 1991 . (Ref. 28197)

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)		COSEWIC
NativeSNRNo StatusNot Listed



BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Additional Range and Status Information Links

NatureServe Explorer
 University of Alaska Museum

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