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Lampriformes - Lampridae

Lampris guttatus (Opah)

Illustration Meristics Life History ELH Descr. Distribution Footnotes
More information for this taxon at: LarvalBase | FishBase | Univ. Washington Data


Egg Diameter (min-max in mm): 1.7 - 4
Number of Oil Globules (min-max):
Oil Globule Diameter (min-max in mm):
Yolk: Homogeneous in known forms
Chorion: Thick, resilient
Egg/Embryo Pigment:
Pigment Diagnostics:
Diagnostic Characters: Large egg diameter, precocious development of fins, ovarian eggs have thick chorion with amber tint


Hatch Size (min-max in mm SL):
Preanal Length (%SL): <50, increasing with development to > or equal to 50
Flexion Length (in mm SL):
Length at Transformation (in mm SL):
Fin Development Sequence: Anterior dorsal and pelvics precocious; dorsal, anal, and caudal; pectorals
Larval Pigment Regions: In each developmental larval stage, pigment is present in the regions listed below
(click for pigment regions)
Preflexion: mouth, crown, cheek, dorsal gut,
Flexion: mouth, crown, nape, cheek, dorsal gut, lateral gut, pectoral fin, dorsal, ventral, mediolateral,
Postflexion: mouth, crown, nape, cheek, dorsal gut, lateral gut, ventral gut, pectoral fin, dorsal, ventral, mediolateral,
Pigment Diagnostics:
Diagnostic Characters: Lampriform characters: well-developed protrusible jaws, differentiated guts with open lumen and little yolk, elongate anterior dorsal elements (may be ornamented) and well-developed pelvic elements (may be ornamented with lengths to 40-60% NL); through development pectoral-fin base rotates to a horizontal position with the pectoral fin completely horizontal (resembles adult) by 10 mm. Distinguished from Trachipterus altivelis by: lack of ornamentation on dorsal and pelvic fins (when fins are intact), rapid change in body form from slender at hatching to deep-bodied by 10.6 mm SL. Distinguished from other lamprids by low vertebral and dorsal-fin ray counts but higher pelvic and caudal-fin ray counts4

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last updated: August 2019