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Larvae Information Summary for
Physiculus nematopus
| Main Ref: | Ambrose, D.A. 1996 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | ||||
| Preanal L. % TL | 32 | 24 |
| Place of development | planktonic | |||
| Larval area | California Current region | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | ||||
| Other melanophores on tail | ||||
Post larvae
| Striking feature | light organs | |||
| Striking shape lateral | normal (not striking) | dorsal | tadpole-like | |
| Striking feature | light organs | |||
| Shape of gut | spherical or gut loop | |||
| Gas bladder early | late | |||
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | lateral row | |||
| Other melanophores on tail | tail partly covered with melanophores | |||
| Melanophores on head + trunk | melanophores on head | |||
| Pigmentation late | ||||
| Rows on tail | lateral row | |||
| Other melanophores on tail | tail partly covered with melanophores | |||
| Melanophores on head + trunk | melanophores on head | |||
| Urostyle region early | pigmented | late | pigmented | |
| Pectorals | normal without melanophores | |||
| Pelvics | fin rays only with melanophores | |||
| In early preflexion stage, pigment on caudal fin and patch at midtail; from late preflexion through postflexion stages, pigment absent along ventral tail margin; heavy ventral patch anterior to anus; total caudal rays 22-26; pelvic fin rays 6; early forming, elongate pelvic fin rays; anus at about 30% BL. Pigmentation: Preflexion: on brain, gut, jaw angle, and operculum; ventral patch near midtail; finfold pigment near end of tail; by about 5 mm, on isthmus, at end of pelvic rays, midtail patch spreads to form bar, and a second tail patch forms anterior to the first; by about 7 mm, heavy patch anterior to anus and row above and below notochord along most of tail. Flexion-postflexion: spreading along pelvic fin and on lateral tail dorsal and ventral to notochord. Juvenile: on fins, branchiostegal region, peritoneum, and scattered over body. Sequence of fin development: pectorals, pelvics, second dorsal and anal, first dorsal and caudal. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 58 | 51 | 36399 |
| 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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