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Larvae Information Summary for
Pollachius virens
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 4.2 | 3.4 | ||
| Preanal L. % TL | 41 | 34.1 | 38.8 | 37 |
| Place of development | planktonic | |||
| Larval area | Northeastern Atlantic; Northwestern Atlantic (Delaware Bay) | |||
| Yolk-sac | ovoid unpigmented | Ref: | ||
| Yolk | unsegmented | Oil globules | no oil globule | |
| Rows on tail | no rows | |||
| Other melanophores on tail | two dorso-ventral clusters or bands | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Vent opens laterally at base of ventral finfold. Pigmentation: Before the yolk is fully absorbed, the 2 postanal bars are quite obvious, and the caudal region is free from pigment. Pigmentation scarse and scattered over anterior portion of body. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | ||
| Striking feature | none | |||
| Shape of gut | triangular | |||
| 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 | two dorso-ventral clusters or bands | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | dorsal + lateral + ventral row | |||
| Other melanophores on tail | two dorso-ventral clusters or bands | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Peritoneum | covered with melanophores | |||
| Pectorals | normal without melanophores | |||
| Pelvics | normal (i.e. small or absent) | |||
| Yolk-sac is absorbed at about 4.5 mm; At 25-30 mm, young begin to resemble adults. Pigmentation: Postanal pigmentation consists of 2 dorsal and 2 ventral bars of melanophores, the dorsal bars being longer than the ventral bars (opposite to the arrangement in the cod). This pigmentation persists until about 8-9 mm, then pigment becomes scattered. Sequence of fin development: Caudal (9 mm); dorsal and anal (15 mm). | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 25 | 23 | 24 | 39467 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | 4 | 37 | May | Jun | Jul | Aug |
| mod | Sep | Oct | Nov | Dec | ||
| Water parameters Metric characters |
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