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Larvae Information Summary for  Esox americanus
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Main Ref: Jones, P.W., F.D. Martin and J.D. Hardy Jr. 1978
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 6.1 5.8    
Preanal L. % TL        
Place of development in close association with substrate
Larval area Mid-Atlantic Bight
Yolk-sac ovoid     Ref:  
Yolk   Oil globules  
Rows on tail  
Other melanophores on tail  
Melanophores on head + trunk melanophores on head
By 9.0 mm TL, mouth fully developed. At 10.0 mm TL, gut partially formed. Pigmentation: At 7-8 mm TL, black eye pigment present. Yolk-sac larvae stage duration: 10-14 days.
Post larvae
Striking feature none
Striking shape lateral normal (not striking) dorsal normal (not striking)
Striking feature none
Shape of gut  
Gas bladder   early   late  
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Rows on tail ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Pectorals normal without melanophores
Pelvics normal (i.e. small or absent) without melanophores
Snout elongates with growth, still quite blunt at 11.6 mm, more elongate at 17.8 mm. Cleithrum and outline of auditory vesicles visible; gill rakers formed and visible through opercle at 11.6 mm; choroid fissure still evident at 17.8 mm. Dorsal finfold extended forward beyond level of ventrals at 11.6 mm, wholly behind ventrals at 17.8 mm. Urostyle oblique; caudal finfold bilobed, adjacent to, but not continuous with, dorsal and ventral finfold at 17.8 mm. Pigmentation: At 11.6 mm, conspicuously darker below than above; lower fourth of abdomen clear except for heavy, mild-ventral dark stripe. Dorsolateral regions with large brown stellate chromatophores; a mid-dorsal light stripe lacking chromatophores; sides of tail posterior to anus with light and dark chromatophores; a dark stripe along snout and continuous behind eye to pectorals. At 17.8 mm, abdomen conspicuously lighter; mid-ventral line reduced; number of dorsal chromatophores increased and concentrated over brain and in dark band between pectoral fins. Sequence of fin development: Pelvic buds formed at 11.6 mm; incipient rays in caudal and anal at 11.6 mm, in dorsal by 17.8 mm.
  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. - 22.06.01
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