Larvae Information Summary for  Gasterosteus aculeatus
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Main Ref: Morrow, J.E. 1980
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 4.5 4.2    
Preanal L. % TL        
Place of development in open nest
Larval area Western Europe (British Isles); North America (Alaska); Northwestern Pacific (Japan)
Yolk-sac spherical     Ref:  
Yolk   Oil globules  
Melanophores on head + trunk melanophores on trunk
Yolk is absorbed at 5.0-6.0 mm. Oil globules are present in the yolk sac. Pigmentation: Pigment absent on lateral line; present on dorsal line.
Post larvae
Striking feature none
Striking shape lateral normal (not striking) dorsal  
Striking feature none
Shape of gut elongated
Gas bladder   early   late  
Spinal armature   early   late  
  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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