| FishBase |
| Main Ref: | Moser, H.G. and E.H. Ahlstrom 1996 | |||
| max | min | mod | Ref. | |
| Length at birth (mm) | 3.4 | |||
| Preanal L. % TL | 60 | 55 |
| Place of development | planktonic | |||
| Larval area | Northeastern Pacific (California Current region); Northwestern Pacific (Japan) | |||
| 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 | |||
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Pectorals | normal without melanophores | |||
| Pelvics | fin rays only without melanophores | |||
| Nearly identical in morphology to Hygophum atratum; undergoes notochord flexion and transformation at slightly larger size; higher total vertebral count (38-40 vs. 35-37 in H. atratum); lower jaw pigment present in H. atratum is not present in most of this species from the California Current region; more melanophores in postanal myosepta pigment series (maximum of 12 vs. maximum of 4 in H. atratum); higher anal fin ray count (21-25) than in H. atratum (18-21). Pigmentation: Preflexion: similar to pattern of H. atratum) except none at lower jaw tip (most specimens), and by end of stage, 1-4 more in postanal series outlining hypaxial myosepta. Flexion: 7-12 in postanal series. Postflexion: 5-10 in postanal series. Sequence of fin development: caudal, pectorals, anal, dorsal and pelvics. | ||||
| max | min | mod | Ref. | |
| Total number of vertebrae | 40 | 38 | 39 | 31442 |
| 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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