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Larvae Information Summary for  Diretmus argenteus
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Main Ref: Watson, W. 1996
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 4      
Preanal L. % TL        
Place of development planktonic
Larval area Eastern Pacific
Yolk-sac       Ref:  
Yolk   Oil globules  
Rows on tail  
Other melanophores on tail  
Post larvae
Striking feature other
Striking shape lateral rhomboid dorsal  
Striking feature other
Shape of gut  
Gas bladder   early   late  
Spinal armature   early   late  
Pigmentation early
Rows on tail no rows
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail dorsal + ventral + lateral row
Other melanophores on tail one dorso-ventral cluster or band
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early unpigmented late unpigmented
Pectorals normal without melanophores
Pelvics normal (i.e. small or absent) without melanophores
Parietal spines usually less inclined caudally than in Diretmoides and Diretmichthys; preopercular spine directed posteriorly rather than anteriorly as in Diretmoides and Diretmichthys; pelvic fin origin below or behind pectoral fin insertion (usually ahead in Diretmoides and Diretmichthys; keeled abdominal scutes form between about 9-13 mm. Pigmentation: Larvae: internally on midbrain, spreading onto fore- and hindbrain by 7 mm; externally on top of head after 12 mm; light on premaxillary, dentary, and preopercle, increasing with growth but remaining relatively light on jaws; saddle under last 11-12 dorsal fin rays, often anterior saddle present between parietal spines and dorsal fin origin, few dorsolateral melanophores to strong stripe between saddles in postflexion stage; bar across end of caudal peduncle by about 7 mm; few ventrolaterally to strong stripe above anal fin base; few on anal fin base; internally over upper third of gut, spreading ventrad; series along isthmus and ventral margin of gut. Juvenile: becoming completely pigmented except on fins by about 30 mm, darkest dorsally, lightest ventrolaterally over gut area. Sequence of fin development: dorsal and anal and pectorals, pelvics, caudal.
  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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