FishBase |
Main Ref: | Russell, F.S. 1976 |
max | min | mod | Ref. | |
Length at birth (mm) | 3.9 | 2.46 | ||
Preanal L. % TL | 51.8 | 35.4 | 41.1 | 37 |
Place of development | planktonic | |||
Larval area | Northeastern Atlantic (British coasts); Northwestern Atlantic (Delaware Bay) | |||
Yolk-sac | elongated unpigmented | Ref: | 37 | |
Yolk | unsegmented | Oil globules | one oil globuleposteriorventralpigmented | |
Rows on tail | dorsal + ventral row | |||
Other melanophores on tail | tail partly covered with melanophores | |||
Melanophores on head + trunk | melanophores on head + trunk | |||
A group of melanophores on the head. Peritoneal black pigment occurs on the upper half of the abdomen. Vent opens at the margin of the finfold. |
Striking feature | none | |||
Striking shape lateral | normal (not striking) | dorsal | tadpole-like | |
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 | no other melanophores | |||
Melanophores on head + trunk | melanophores on head + trunk | |||
Pigmentation late | ||||
Rows on tail | dorsal + lateral + 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 | covered with melanophores | |||
Pectorals | normal without melanophores | |||
Pelvics | normal (i.e. small or absent) | |||
At 6 mm, yolk-sac is absorbed, sharp teeth on upper and low jaws. A flask-shaped form of the stomach and rectum is present. Pigmentation: a group of melanophores on the head. Ventral and dorsal melanophores start a definite distance behind the anus. Sequence of fin development: caudal (6 mm); second dorsal (9 mm); anal (9 mm); first dorsal (12-15 mm); finlets (22) |
max | min | mod | Ref. | |
Total number of vertebrae | 31 | 65 |
L 1st feeding | Ref. |
Months of presence of larvae
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max | Jan | Feb | Mar | Apr | ||
min | May | Jun | Jul | Aug | ||
mod | 4.5 | Sep | Oct | Nov | Dec |
Water parameters Metric characters |
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