Shorefishes of the Tropical Eastern Pacific Online Information System
Updated: 06/12/2008  
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    Opistognathus  
Perciformes  -  Opistognathidae  -  Opistognathus  -  Opistognathus rosenblatti

Opistognathus rosenblatti

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  tan + rows large blue spots
 
 

  gill rakers 34-35
 
pectoral: 17-18
 

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Opistognathus rosenblatti Allen & Robertson, 1991


Blue-spotted jawfish



Elongate, compressed, tapering body; large bulbous head; eye large, high; no cirrus at front nostril; end of top jaw straight, without fringe at rear; upper jaw 51-53% of head length, same size in males and females; lips with inner papillae; center of roof of mouth without teeth; no broad flap under operculum; gill rakers 34-35; dorsal rays XI, 13-14; anal rays II, 13-14; pectoral rays 18 (rarely 17); tail rounded, much shorter than head; lateral line on front half of body only, high; scales small, smooth, none on head, body with 65-70 oblique scale rows.



Females and non-courting males  with orange-brown head and dark brown to blackish body, covered with relatively large blue spots; courting males white anteriorly and blackish on posterior half with large brown spot on anterior part of dorsal fin; no obvious color inside mouth; small juveniles yellow with blue spots.


Maximum size about 10 cm.

Habitat: found in sandy rubble areas in colonies of up to several hundred fish with a minimal spacing of about 1m between individuals; each fish constructs a lid over their burrow entrance at dusk and rebuilds the opening each morning.

Depth: 5-25 m.

The  lower 3/4 of the Gulf of California and the Revillagigedo Islands.

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