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Larvae Information Summary for
Argyropelecus sladeni
| Main Ref: | Watson, W. 1996 | |||
Yolk-sac larvae
| 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 | no rows | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | no melanophores on head or trunk | |||
Post larvae
| Striking feature | light organs | |||
| Striking shape lateral | hatchet-like | dorsal | tadpole-like | |
| Striking feature | light organs | |||
| Shape of gut | elongated | |||
| 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 | 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 | |
| Pectorals | normal without melanophores | |||
| Pelvics | fin rays only without melanophores | |||
| Upper preopercular spine is developed pointed slightly upward and short frontal crests are present; distinguished from A. affinis and A. hemygymnus by combination of nine dorsal spines and SAB, PAN, AN, and SC photophores not in continuous line; no internal pigment in tail; pair of large melanophores anteriorly over midbrain in transformation stage; narrow choroid tissue mass below eye; short preanal length. Pigmentation: Preflexion-postflexion: none. Transformation: none before SC photophores form; by about 9.2-9.5 mm (white SC photophores present at this size) on frontal region adjacent to eye, anteriorly on each side of midbrain, along lower posttemporal/upper supracleithrum region, over gas bladder, around stomach; subsequently increases over gut area, laterally above gut, on opercular area, and over brain. nitially, appears anteriorly on body in patches and, with development, increases posteriorly; spot on peduncle does not appear as early as A. affinis, first appearing as a patch in larvae >13 mm SL. Sequence of fin development: caudal, pectorals, anal, dorsal and pelvics. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of myomeres | 12 | 11 | 35838 | |
| Preanal number of myomeres | 37 | 35 | 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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