FishBase |
Main Ref: | Watson, W. 1996 |
max | min | mod | Ref. | |
Length at birth (mm) | ||||
Preanal L. % TL |
Place of development | planktonic | |||
Larval area | California Current region | |||
Yolk-sac | Ref: | |||
Yolk | Oil globules | |||
Rows on tail | ||||
Other melanophores on tail |
Striking feature | light organs | |||
Striking shape lateral | normal (not striking) | dorsal | ||
Striking feature | light organs | |||
Shape of gut | elongated | |||
Gas bladder early | late | pigmented | ||
Spinal armature early | late | |||
Pigmentation early | ||||
Rows on tail | no rows | |||
Other melanophores on tail | no other melanophores | |||
Melanophores on head + trunk | no melanophores on head or trunk | |||
Pigmentation late | ||||
Rows on tail | no rows | |||
Other melanophores on tail | no other melanophores | |||
Melanophores on head + trunk | no melanophores on head or trunk | |||
Urostyle region early | unpigmented | late | unpigmented | |
Peritoneum | with row of melanophores | |||
Pectorals | normal without melanophores | |||
Pelvics | fin rays only without melanophores | |||
Larvae elongate; photophores begin formation at about 16.5 mm SL; photophores in clusters with common bases; metamorphosis gradual with the initial formation of photophores in the BR and PV groups; distinguished from Argyropelecus and Sternoptyx species by long anal fin (24-25 fin rays) and short dorsal fin (6 fin rays); eyes less narrow than in Aryropelecus; transformation beginning at large size (> or = 16.5 mm); long anal fin base, short dorsal fin base; only first 3 AN photophores with common base. Pigmentation: Preflexion-postflexion: none until end of postflexion stage when pigment forms over gas bladder. Transformation: only on gas bladder initially; posteriorly on midbrain and around stomach by about 21.5 mm; increases to cover most of gut region and head by about 23.5 mm; dorsolateral series of about 1/myomere forms on first 7-8 myomeres by about 23.5 mm, extends along lateral midline to caudal peduncle in juvenile stages; concentrated on preanal body in area below eye and over gut; smaller larvae generally unpigmented except over peritoneum. Sequence of fin development: caudal, anal, pectorals, pelvics, dorsal. |
max | min | mod | Ref. | |
Total number of myomeres | 39 | 37 | 35838 | |
Preanal number of myomeres | 15 | 11 | 35838 |
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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