Larvae Information Summary for  Amia calva
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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) 7 3    
Preanal L. % TL        
Place of development in open nest
Larval area Mid-Atlantic Bight
Yolk-sac ovoid   unpigmented Ref:  
Yolk   Oil globules  
Melanophores on head + trunk melanophores on head
Total myomeres: 60. By about 10 mm, incipient rays as follows: D. 47; A. 9; C. 16; P. 14. Body "tadpole-like", flexed at hatching, straightened by 2nd day. Yolk initially spherical and with prominent vitelline vessels; egg-shaped at 1 day; posterior end distinctly pointed, ventral surface concave, and anterior part covered by opercular flap by about 7.0 mm; greatly reduced by 10.5 mm. Mandible distinct by about 9.0 mm. At about 10.0 mm, adhesive organ reduced to small, non-functional tubercle; gular plate visible; maxillary and premaxillary established. Mouth functional by 11.0 mm. Eye oval at hatching. Choroid fissure still evident at about 7.2 mm. Pectorals oblique in specimens 6-8 mm long, vertical at 9-10 mm, and with ossified support elements at 11.0 mm. Origin of dorsal finfold over pectorals at 10 mm, further back at earlier stages. Lateral line evident anteriorly at 1 day. Pigmentation: At hatching, body pale, flesh-colored; yolk sac deep sepia or pale slate; eye with traces of pigment. At 6-8 mm, pigment developed on head. At 12 mm, Body dark greenish black, greenish brown, or black above, dirty white below; iris metallic golden.
Post larvae
Striking feature none
Striking shape lateral normal (not striking) dorsal  
Striking feature none
Shape of gut  
Gas bladder   early   late  
Spinal armature   early   late  
Melanophores on head + trunk melanophores on trunk
Melanophores on head + trunk melanophores on trunk
Pectorals normal  
Pelvics normal (i.e. small or absent)  
Body tadpole-like; jaw shorter than upper. Adhesive disc evident as small, median opening at apex of upper jaw at 17-18 mm; no longer visible, except histologically, at 20 mm. Skull cartilaginous at 15-16 mm. Gular plate 4-lobed at about 13 mm. Nasal openings fully established by 10th day (about 13 mm), developing as tube-like outgrowths by about 15th day. Pelvics first evident at 10-11mm; preanal finfold lost by about 29 mm. Scales first evident by about 26 mm, entire trunk region scaled at about 29 mm; lateral line complete at about 11 mm. Urostyle tipped slightly upward at 21 mm, conspicuously upturned and extended into dorsal lobe of caudal at about 25 mm. Pigmentation: At 9-11 mm, body deeply pigmented with brown; at 12-30 mm, back and sides black and acquiring a greenish hue.
  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. - 29.05.01
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