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Larvae Information Summary for
Trachurus trachurus
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 2.5 | 1.8 | 2.2 | |
| Preanal L. % TL | 57 | 56 | 56.5 |
| Place of development | planktonic | |||
| Larval area | to be filled | |||
| Yolk-sac | ovoid unpigmented | Ref: | ||
| Yolk | segmented | Oil globules | one oil globuleanteriorcentralpigmented | |
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Anterior edge of yolk-sac slightly beyond the anterior point of head. Anus well behind the yolk-sac. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | normal (not striking) | |
| Striking feature | none | |||
| Shape of gut | triangular | |||
| Gas bladder early | pigmented | late | pigmented | |
| Spinal armature early | opercular spines only | late | opercular spines only | |
| Pigmentation early | ||||
| Rows on tail | dorsal + lateral + 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 | |||
| Pelvics | normal (i.e. small or absent) | |||
| In larvae 4 mm long: 4-5 opercular spines on the outer row and about 5 on the inner row, becoming more in the later postlarvae. Numerous melanophores on lower jaw, along abdomen and on head and upper surface of stomach. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 24 | 65 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | 3.24 | Sep | Oct | Nov | Dec | |
| Water parameters Metric characters |
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