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Larvae Information Summary for
Argyropelecus affinis
| Main Ref: | Watson, W. 1996 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 3.7 | 2 | ||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | California Current region | |||
| Yolk-sac | Ref: | |||
| Yolk | segmented | Oil globules | one oil globule | |
| 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 | other | |
| Striking feature | light organs | |||
| Shape of gut | spherical or gut loop | |||
| Gas bladder early | invisible | late | invisible | |
| Spinal armature early | no spines | late | several different spines | |
| 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 | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | unpigmented | late | pigmented | |
| Peritoneum | without melanophores | |||
| Pectorals | normal | |||
| Pelvics | normal (i.e. small or absent) | |||
| At 5 mm the first light organ appears on the preoperculum. Internal pigment at last 1-10 myomeres; short preanal length; photophores in AN and SC groups widely spaced. Pigmentation: Preflexion-postflexion: internally on notochord at last myomere, extending as far forward as last 5-10 myomeres in some. Transformation: over gas bladder; around stomach; on frontals between eyes; subsequently increasing over fore- and midbrain, on opercular area, on gut; lateral midline series begins at about 13-16 mm; internal caudal peduncle pigment condenses to one blotch. Sequence of fin development: caudal, anal and pectorals, dorsal, pelvics. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of myomeres | 41 | 38 | 39 | 35838 |
| Preanal number of myomeres | 15 | 10 | 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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