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Larvae Information Summary for  Symphurus nigrescens
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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) 1.75 1.45 1.6  
Preanal L. % TL        
Place of development  
Larval area to be filled
Yolk-sac     pigmented Ref:  
Yolk   Oil globules no oil globule
Rows on tail no rows
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Melanophores on the primordial fin at the dorsal and pectoral region.
Post larvae
Striking feature  
Striking shape lateral short and/or deep dorsal compressed
Striking feature  
Shape of gut spherical or gut loop
Gas bladder   early pigmented late pigmented
Spinal armature   early   late  
Rows on tail no rows
Other melanophores on tail one dorso-ventral cluster or band
Rows on tail no rows
Other melanophores on tail one dorso-ventral cluster or band
Urostyle region   early pigmented late pigmented
Peritoneum covered with melanophores
Pectorals normal  
Pelvics normal (i.e. small or absent)  
At 6mm: D 85; A 70. At 8-9mm: D 5+85; A 76, the urochord has not yet turned up. The intestine partially hangs free out of the visceral sac.
Meristic characters
  max min mod Ref.
Total number of vertebrae     48  
Preanal number of vertebrae     9  
  L 1st feeding Ref. Months of presence of larvae
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod 5.5   Sep Oct Nov Dec
Water parameters     Metric characters
Entered by: Papasissi,Christine - 29.10.90
Modified by: Luna,Susan M. - 19.02.91
Checked by: Giovanardi,Otello - 19.02.91
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