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Larvae Information Summary for  Hyperoplus lanceolatus
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Main Ref: Russell, F.S. 1976
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm)     4.5  
Preanal L. % TL 68.3 63.2 65.5  
Place of development planktonic
Larval area to be filled
Yolk-sac     pigmented Ref:  
Yolk unsegmented Oil globules one oil globule
Rows on tail ventral row
Other melanophores on tail tail with single melanophore
Melanophores on head + trunk melanophores on head + trunk
Black pigmentation on dorsal and postanal body rows, and dorsal and ventral gut rows. The rectum does not reach the fin margin.
Post larvae
Striking feature none
Striking shape lateral normal (not striking) dorsal normal (not striking)
Striking feature none
Shape of gut elongated
Gas bladder   early invisible late invisible
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail dorsal + ventral row
Other melanophores on tail tail with single melanophore
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail dorsal + ventral row
Other melanophores on tail tail with single melanophore
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early pigmented late pigmented
Peritoneum with row of melanophores
Pectorals normal  
Pelvics normal (i.e. small or absent)  
Early forward extension of the dorsal body row of melanophores, eventually right to the head, and presence of ventral gut melanophores. In later stages, the caudal pigmentation is characteristic of the species.
Meristic characters
  max min mod Ref.
Total number of vertebrae 70 64 67 37
  L 1st feeding Ref. Months of presence of larvae
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod 5.25   Sep Oct Nov Dec
Water parameters     Metric characters
Entered by: Froese,Rainer - 19.10.90
Modified by: Froese,Rainer - 01.03.91
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