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Larvae Information Summary for  Scophthalmus rhombus
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Main Ref: Russell, F.S. 1976
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 4 3.8 3.9  
Preanal L. % TL 50 46.5 48.5  
Place of development planktonic
Larval area to be filled
Yolk-sac elongated   pigmented Ref:  
Yolk unsegmented Oil globules one oil globulecentralventral
Rows on tail no rows
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
No pigment at the caudal region. Black chromatophores extend to the primordial fin forming a wide postanal bar and a dorsal patch above rectal region.
Post larvae
Striking feature none
Striking shape lateral short and/or deep dorsal compressed
Striking feature none
Shape of gut spherical or gut loop
Gas bladder   early   late  
Spinal armature   early no spines late several different spines
Pigmentation early
Rows on tail no rows
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail no rows
Other melanophores on tail tail completely covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Peritoneum covered with melanophores
Pectorals normal  
Pelvics normal (i.e. small or absent) with melanophores
Distinctive caracteristic from Psetta maxima: at 7-8 mm, there are no true rays in the fins, and armature is not yet spiny. At later stage fairly less spines developed on head and operculum. Urostyle not so strongly bent up.
Meristic characters
  max min mod Ref.
Total number of vertebrae     30 65
  L 1st feeding Ref. Months of presence of larvae
max 5   Jan Feb Mar Apr
min 4.5   May Jun Jul Aug
mod 4.75   Sep Oct Nov Dec
Water parameters     Metric characters
Entered by: Papasissi,Christine - 19.10.90
Modified by: Luna,Susan M. - 28.02.91
Checked by: Giovanardi,Otello - 15.02.91
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