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Larvae Information Summary for  Icosteus aenigmaticus
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Main Ref: Matarese, A.C., A.W. Kendall, D.M. Blood and M.V. Vinter 1989
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm)        
Preanal L. % TL        
Place of development planktonic
Larval area Southern California, 32-34° N, to Bering Sea, 54-66° N
Yolk-sac       Ref:  
Yolk   Oil globules  
Post larvae
Striking feature  
Striking shape lateral   dorsal  
Striking feature  
Shape of gut  
Gas bladder   early   late  
Spinal armature   early   late  
Diagnostic characters: preflexion pigment: three opposing blotches inmedian finfold, one in caudal finfold; pelvic fin present in larvae, lost in adults; dorsal and anal fin begin to develop in finfold, have deep bases; morphological changes with development, from elongate to deep-bodied; blunt head; small preopercular spines. Pigment: head and gut covered with discrete spots; dorsal body margin; caudal finfold pigment becoming less prominent with development; pectoral and pelvic fin bases (postflexion); three opposing blotches on dorsal and ventral finfolds in preflexion larvae. Sequence of fin development: pectorals, pelvics, dorsal, anal; caudal not complete in 28.5 SL specimen.
  L 1st feeding Ref. Months of presence of larvae
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod     Sep Oct Nov Dec
Water parameters     Metric characters
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