FishBase
Larvae Information Summary for  Scopelengys tristis
( not available )

Main Ref: Fahay, M. 1983
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm)        
Preanal L. % TL 66 48    
Place of development planktonic
Larval area NW Atlantic (Mid-Atlantic Bight); NE Pacific (California Current region); NW Pacific (Japan)
Yolk-sac       Ref:  
Yolk   Oil globules  
Rows on tail  
Other melanophores on tail  
Post larvae
Striking feature teeth clearly visible
Striking shape lateral short and/or deep dorsal  
Striking feature teeth clearly visible
Shape of gut spherical or gut loop
Gas bladder   early absent late absent
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail no rows
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head
Pigmentation late
Rows on tail no rows
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head
Urostyle region   early unpigmented late unpigmented
Peritoneum without melanophores
Pectorals strikingly large without melanophores
Pelvics fin rays only without melanophores
Deep, laterally compressed body; gut moderate in length, robust, strongly sigmoid; large head with long pointed snout; eyes small and round; no choroid tissue; adipose fin present; teeth needle-like, larger at tip of jaws; pectoral fin forms early in preflexion stage and becomes large; pigment streak through eye; similar S. clarkei lacks eye stripe and has mandibular, posterior head, and nape pigment after flexion stage. Pigmentation: Preflexion: smallest larvae have a blotch above gut and about 7 in a postanal median ventral series, but no peritoneal gut pigment as in other myctophiform families; by 4.6 mm, an embedded linear blotch in snout and an embedded post-orbital blotch give the appearance of a streak through eye. Flexion-postflexion: postanal series reduced to 1-5, or absent; blotch above gut becomes elongate. Sequence of fin formation: pectorals (3.5 mm SL), caudal, dorsal and anal (5.0-7.0 mm SL), pelvics (6.5-7.0 mm SL).
Meristic characters
  max min mod Ref.
Total number of myomeres 32 29   68
  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
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