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Larvae Information Summary for  Poromitra megalops
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Main Ref: Sandknop, E.M. and W. Watson 1996
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 2.4      
Preanal L. % TL        
Place of development planktonic
Larval area Northeastern pacific (California Current region); Northwest Pacific (Japan)
Yolk-sac       Ref:  
Yolk   Oil globules  
Rows on tail  
Other melanophores on tail  
Post larvae
Striking feature none
Striking shape lateral normal (not striking) dorsal  
Striking feature none
Shape of gut triangular
Gas bladder   early pigmented late  
Spinal armature   early opercular spines only late several different spines
Pigmentation early
Rows on tail ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head
Rows on tail lateral row
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Pectorals normal without melanophores
Pelvics normal (i.e. small or absent) without melanophores
Myomeres 7-10+18-21=27-29 (usually 7+21 in preflexion stage, 9+19 by postflexion stage); preopercular and opercular spines form at end of flexion stage; posttemporal spines form during mid-postflexion stage (about 8 mm); frontal and nasal spines form late in postflexion stage; eyes relatively large; longitudinally elongate dash-like melanophores on trunk and tail beginning in late flexion or early postflexion stage; little or no pigment on pectoral and pelvic fins. Pigmentation: Preflexion: under mid- and hindbrain; along cleithrum; on gas bladder and upper part of gut; few along ventral margin of tail. Flexion: dorsolaterally posteriorly on midbrain, around lower half of forebrain; internally near posterior margin of eye after 6 mm; longitudinally elongate dashes, primarily near dorsal and ventral margins and along lateral midline initially, filling in laterally from trunk to tail; few on caudal fin. Postflexion: on frontal above eye; over posterior part of midbrain between 6.4-11.5 mm; proximal bar across principal caudal fin rays by 11.8 mm. Sequence of fin development: dorsal and pectorals and pelvics, caudal, anal.
Meristic characters
  max min mod Ref.
Total number of myomeres 29 27   36655
  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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