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Larvae Information Summary for  Margrethia obtusirostra
( not available )

Main Ref: Fahay, M. 1983
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm)        
Preanal L. % TL        
Place of development planktonic
Larval area Mid-Atlantic Bight; Northwestern Pacific (Japan)
Yolk-sac       Ref:  
Yolk   Oil globules  
Rows on tail  
Other melanophores on tail  
Post larvae
Striking feature light organs
Striking shape lateral normal (not striking) dorsal  
Striking feature light organs
Shape of gut elongated
Gas bladder   early   late  
Spinal armature   early   late  
Pigmentation early
Rows on tail no rows
Other melanophores on tail one dorso-ventral cluster or band
Melanophores on head + trunk no melanophores on head or trunk
Pigmentation late
Rows on tail no rows
Other melanophores on tail one dorso-ventral cluster or band
Melanophores on head + trunk no melanophores on head or trunk
Urostyle region   early unpigmented late unpigmented
Pectorals normal without melanophores
Pelvics normal (i.e. small or absent) without melanophores
Anal and dorsal fin origins about the same level or anal slightly posterior; anterior dorsal and anal rays longer; pelvic fin origin slightly anterior to dorsal fin origin; adipose fin present; oval eye (becomes round); photophores present. Pigmentation: A distinct vertical streak of pigment on caudal peduncle in most specimens.
Meristic characters
  max min mod Ref.
Total number of myomeres     34 68
  L 1st feeding Ref. Months of presence of larvae    Ref. 
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod     Sep Oct Nov Dec
Water parameters     Metric characters
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