Larvae Information Summary for Ichthyococcus irregularis
( not available )

Main Ref: Watson, W. 1996
Yolk-sac larvae
  min max mod Ref.
Length at birth (mm) 3 4    
Preanal L. % TL        
Place of development planktonic
Larval area California Current region
Yolk-sac elongated     Ref:  
Yolk   Oil globules  
Rows on tail no rows
Other melanophores on tail no other melanophores
Melanophores on head + trunk no melanophores on head or trunk
Pigmentation: small ventral patch between pectoral fin bases; on pectoral bases.
Post larvae
Striking feature light organs
Striking shape lateral normal (not striking) dorsal  
Striking feature light organs
Shape of gut tube-like
Gas bladder   early   late  
Spinal armature   early   late  
Pigmentation early
Rows on tail lateral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail lateral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early unpigmented late unpigmented
Pectorals other melanophores at fin base
Pelvics fin rays only without melanophores
Pectoral fin with elongate lower portion; trailing gut after about 5-6 mm; pigmented along lower part of myosepta, on pectoral fin and ventrum between pectoral fins, on branchiostegal membrane, stripes on snout. Pigmentation: Preflexion-postflexion: ventrolateral series along myosepta, increases with larval size, extends onto caudal finfold by about 6 mm; increases on pectoral fin base and ventrum between bases, spreads onto isthmus by 6 mm; patch on branchiostegal membrane by 4.9 mm; pair of longitudinal bands on snout; along mandibular symphysis extending along sides of lower jaw by 8 mm; on trailing part of gut. Sequence of fin development: caudal, dorsal, anal, pelvics, pectorals.
Meristic characters
  min max mod Ref.
Total number of myomeres 37 40   35839
Preanal number of myomeres 25 27   35839
  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
Comments & Corrections

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