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Larvae Information Summary for  Merluccius bilinearis
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Main Ref: Fahay, M. 1983
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 3.5 2.6    
Preanal L. % TL     45 68
Place of development planktonic
Larval area Mid-Atlantic Bight (Cape Hatteras to Southern Scotian Shelf; Delaware Bay)
Yolk-sac     pigmented Ref:  
Yolk   Oil globules one oil globuleposteriorcentralpigmented
Rows on tail no rows
Other melanophores on tail two dorso-ventral clusters or bands
Melanophores on head + trunk melanophores on head + trunk
Eyes unpigmented; mouth unformed. Vent opens laterally on finfold (not at margin). Pigmentation: Pigment on oil globule and on yolk near head and gut; scattered head and gut pigment, and 2 bands on tail (one just posterior to vent and the other about midway between vent and tip of tail).
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 no rows
Other melanophores on tail more than two dorso-ventral clusters or bands
Melanophores on head + trunk melanophores on head
Pigmentation late
Rows on tail no rows
Other melanophores on tail more than two dorso-ventral clusters or bands
Melanophores on head + trunk melanophores on head
Urostyle region   early pigmented late pigmented
Peritoneum with row of melanophores
Pectorals normal without melanophores
Pelvics normal (i.e. small or absent) without melanophores
Yolk-sac is absorbed at about 4 mm. Body slender and tapering; head large; finfold between 1st and 2nd dorsal fins disappears by about 12 mm NL. Teeth visible at about 7.5 mm. At 20-25 mm, young assume adult appearance. Pigmentation: 2 tail bands, about equal in intensity vary from distinct spots or bars to dendritic accumulations; spots on snout, crown, nape and peritoneum, and on notochord tip after yolk absorption; dorsal and anal fins unpigmented; pectoral and pelvic fins unpigmented (or rarely lightly pigmented); pelvic fins moderately long; buds formed at about 7 mm NL and fins reach anus at about 10 mm NL; finfold between 1st and 2nd dorsal fins disappears by about 12 mm NL. Sequence of fin formation: caudal (10-11mm); 1st dorsal; pelvic; 2nd dorsal and anal (10-11 mm); pectoral. Larvae settle on the bottom between 17.0 and 20.0 mm NL or larger.
Meristic characters
  max min mod Ref.
Total number of myomeres 56 54   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
Entered by: Luna,Susan M. - 11.08.00
Modified by: Luna,Susan M. - 25.01.02
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