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Larvae Information Summary for  Bathylagoides wesethi
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Main Ref: Moser, H.G. and E.H. Ahlstrom 1996
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm)     3 35604
Preanal L. % TL        
Place of development planktonic
Larval area California Current region
Yolk-sac       Ref:  
Yolk segmented Oil globules more than one oil globule
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 tube-like
Gas bladder   early   late  
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail no rows
Other melanophores on tail one dorso-ventral cluster or band
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail no rows
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early pigmented late pigmented
Peritoneum with row of melanophores
Pectorals normal melanophores at fin base
Pelvics normal (i.e. small or absent) without melanophores
Eyes not stalked; complex pigment pattern unique among Bathylagus species (including Leuroglossus spp.); voluminous rugose foregut; fewer pairs of ventrolateral gut melanophores (6-8) than in B. nigrigenys (8-10); dorsal and ventral pigment at notochord tip vs. only ventrally in B. nigrigenys; trunk series heavier and more regular than in B. nigrigenys; more total vertebrae than B. nigrigenys (43-47 vs. 41-45); only bathylagid without stalked eyes and pigment consisting of a linear series of small melanophores. Pigmentation: linear series of small melanophores; initially a series of paired spots dorsolaterally to gut extending from pectoral fin base to terminal section, becoming embedded with development (6-8 pairs developing to 7-8 pairs); notochord tip (dorsal and ventral). Flexion: series of melanophores develops along hypaxial region, and soon after a series develops along epaxial; more lateral spots are added; median finfold; increased head pigment. Postflexion-transformation: hypaxial and epaxial series along entire body, then 2 or more per myomere. Sequence of fin development: caudal, anal, dorsal, pectorals and pelvics.
  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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