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Rockhead (fish)
The Rockhead (''Bothragonus swanii'', also known as the Deep-pitted poacher or the Deep-pitted sea-poacher〔(Common names for ''Bothragonus swanii'' ) at www.fishbase.org.〕) is a fish in the family Agonidae (poachers).〔(''Bothragonus swanii'' ) at www.fishbase.org.〕 It was described by Franz Steindachner in 1876, originally in the genus ''Hypsagonus''.〔Steindachner, F. 1876 (4225 ) ''Ichthyologische Beiträge (V).'' (i-v. ). Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe v. 74 (1. Abth.): 49-240, Pls. 1-15.〕 It is a marine, temperate water-dwelling fish which is known from the eastern Pacific Ocean, including Alaska, Carmel Bay, and California, USA. It dwells at a depth range of 0–18 metres, and inhabits intertidal regions. Males can reach a maximum total length of 8.9 centimetres.〔
The species epithet "''swanii''" refers to James G. Swan of Port Townsend, Washington.〔 The Rockhead spawns nearshore, during the months of January–May in the California Current region.〔(Spawning for ''Bothyragonus swanii'' ) at www.fishbase.org.〕 Its diet consists of benthic shrimp and crabs.〔(Food items reported for ''Bothragonus swanii'' ) at www.fishbase.org.〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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