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Larvae Information Summary for
Hyperoplus immaculatus
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | ||||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | North Sea | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | ||||
| Other melanophores on tail | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | normal (not striking) | |
| Striking feature | none | |||
| Shape of gut | elongated | |||
| Gas bladder early | invisible | late | invisible | |
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | pigmented | late | pigmented | |
| Peritoneum | with row of melanophores | |||
| Pectorals | normal | |||
| Pelvics | normal (i.e. small or absent) | |||
| At 5.5 mm, there are 3 dorsal melanophores in the caudal region. Distinctive characters are: absence of a ventral gut row of melanophores, early forward extension of the dorsal body row of melanophores, and absence or weak development of caudal pigment. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 74 | 70 | 72 | 37 |
| L 1st feeding | Ref. |
Months of presence of larvae
|
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| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | 5.5 | Sep | Oct | Nov | Dec | |
| Water parameters Metric characters |
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