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Larvae Information Summary for  Urophycis chuss
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Main Ref: Scotton, L.N., R.E. Smith, N.S. Smith, K.S. Price and D.P. de Sylva 1973
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 2.29 1.76    
Preanal L. % TL        
Place of development planktonic
Larval area Middle Atlantic Bight (Delaware Bay, New Jersey, Virginia)
Yolk-sac       Ref:  
Yolk   Oil globules  
Rows on tail dorsal + ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Vent opens laterally at the base of finfold. Large pigment spots present mainly along dorsal and ventral outline and on top of head. Oil globule conspicuously pigmented.
Post larvae
Striking feature none
Striking shape lateral normal (not striking) dorsal  
Striking feature none
Shape of gut triangular
Gas bladder   early   late  
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail dorsal + ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail no rows
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early unpigmented late unpigmented
Peritoneum with row of melanophores
Pectorals normal  
Pelvics with elongated fin rays with melanophores
Yolk-sac absorbed at about 2.2 mm. Pigmentation: a single melanophore on the nape, dorso-ventral pair midway back on body, and the dorsal surface of gut is pigmented. This pattern persists until about 6 mm, then pigment becomes scattered. Distal pigments present in pelvics. Sequence of fin development: pelvic (2.75 mm); second dorsal and anal (7 mm)
Meristic characters
  max min mod Ref.
Total number of vertebrae 51 45   32309
  L 1st feeding Ref. Months of presence of larvae  
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod     Sep Oct Nov Dec
Water parameters     Metric characters
Entered by: Luna,Susan M. - 18.01.02
Modified by: Luna,Susan M. - 20.02.02
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