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Larvae Information Summary for
Scophthalmus rhombus
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 4 | 3.8 | 3.9 | |
| Preanal L. % TL | 50 | 46.5 | 48.5 |
| Place of development | planktonic | |||
| Larval area | to be filled | |||
| Yolk-sac | elongated pigmented | Ref: | ||
| Yolk | unsegmented | Oil globules | one oil globulecentralventral | |
| Rows on tail | no rows | |||
| Other melanophores on tail | tail partly covered with melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| No pigment at the caudal region. Black chromatophores extend to the primordial fin forming a wide postanal bar and a dorsal patch above rectal region. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | short and/or deep | dorsal | compressed | |
| Striking feature | none | |||
| Shape of gut | spherical or gut loop | |||
| Gas bladder early | late | |||
| Spinal armature early | no spines | late | several different spines | |
| Pigmentation early | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | tail partly covered with melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | tail completely covered with melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Peritoneum | covered with melanophores | |||
| Pectorals | normal | |||
| Pelvics | normal (i.e. small or absent) with melanophores | |||
| Distinctive caracteristic from Psetta maxima: at 7-8 mm, there are no true rays in the fins, and armature is not yet spiny. At later stage fairly less spines developed on head and operculum. Urostyle not so strongly bent up. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 30 | 65 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | 5 | Jan | Feb | Mar | Apr | |
| min | 4.5 | May | Jun | Jul | Aug | |
| mod | 4.75 | Sep | Oct | Nov | Dec | |
| Water parameters Metric characters |
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