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Larvae Information Summary for  Thunnus thynnus
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Main Ref: Bertolini, F., U. D'Ancona, E. Padoa Montalenti, S. Ranzi, L. Sanzo, A. Sparta, E. Tortonese and M. Vialli 1956
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm)     3  
Preanal L. % TL     44.9  
Place of development planktonic
Larval area Northwestern Pacific (Japan)
Yolk-sac ovoid   pigmented Ref:  
Yolk   Oil globules one oil globuleposteriorventralpigmented
Rows on tail dorsal + ventral row
Other melanophores on tail tail with single melanophore
Melanophores on head + trunk melanophores on head + trunk
One to four dorsal postanal melanophores.
Post larvae
Striking feature teeth clearly visible
Striking shape lateral normal (not striking) dorsal normal (not striking)
Striking feature teeth clearly visible
Shape of gut triangular
Gas bladder   early   late  
Spinal armature   early opercular spines only late several different spines
Pigmentation early
Rows on tail ventral row
Other melanophores on tail two dorso-ventral clusters or bands
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail no rows
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early unpigmented late unpigmented
Peritoneum covered with melanophores
Pectorals normal  
Pelvics normal (i.e. small or absent)  
At 6.8 mm, pelvic fins have appeared. Several preopercular spines in two rows as early spinal armature; late stage of spinal armature comprise several elongated posterior spines.
Meristic characters
  max min mod Ref.
Total number of vertebrae     39  
Preanal number of vertebrae     18  
  L 1st feeding Ref. Months of presence of larvae    Ref. 
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod 3.8   Sep Oct Nov Dec
Water parameters     Metric characters
Entered by: Papasissi,Christine - 29.10.90
Modified by: Luna,Susan M. - 08.04.03
Checked by: Giovanardi,Otello - 19.02.91
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