Larvae Information Summary for Ctenogobius boleosoma
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Main Ref: Scotton, L.N., R.E. Smith, N.S. Smith, K.S. Price and D.P. de Sylva 1973
Yolk-sac larvae
  min max mod Ref.
Length at birth (mm)     1.2 39467
Preanal L. % TL        
Place of development  
Larval area Delaware Bay
Yolk-sac       Ref:  
Yolk   Oil globules  
Melanophores on head + trunk no melanophores on head or trunk
Highly transparent, with vent near the middle of the body; dorsal and anal finfolds are continuous, and yolk sac is small.
Post larvae
Striking feature lower jaw strongly projecting
Striking shape lateral normal (not striking) dorsal  
Striking feature lower jaw strongly projecting
Shape of gut elongated
Gas bladder   early visible late visible
Spinal armature   early no spines late no spines
Urostyle region   early unpigmented late unpigmented
Peritoneum covered with melanophores
Pectorals normal  
Pelvics normal (i.e. small or absent)  
At 2.5 mm, the yolk is absorbed, air bladder is visible with black peritoneum becoming visible above it. At 3.5 mm, the characteristic black, crescent-shaped peritoneum over the air bladder is present; caudal fin striations and pectoral fin buds (without rays) are present. At 5.0 mm, the mouth is superior (maxillary does not extend to eye), principal rays of caudal are fully formed, soft dorsal and anal fins contain some well-developed rays; pectoral rays still not differentiated; notochord is bent upward at tip; crescent-shaped dark area over air bladder is prominent and is an important identification feature. At 7.5mm, SL increased to about 7.5 to 8.0 times; soft dorsal and anal rays have reached a full complement; spinous dorsal is undeveloped. At 10.0 mm, body is still slender; maxillary reaching opposite anterior margin of eye; fins all developed; crescent-shaped dark area over air bladder is very prominent; differences between fish 10 mm long and those 13 mm long are slight. Specimens of about 10 mm resemble adults, e.g. dorsal and anal fins each have 11 to 13 rays.
  L 1st feeding Ref. Months of presence of larvae  
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod 2.5 39467 Sep Oct Nov Dec
Water parameters     Metric characters
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