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Larvae Information Summary for
Trachinus draco
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 3.2 | 2.4 | 2.8 | |
| Preanal L. % TL | 37.5 | 35.7 | 36.5 | 37 |
| Place of development | planktonic | |||
| Larval area | Eastern Atlantic and Mediterranean | |||
| Yolk-sac | ovoid unpigmented | Ref: | ||
| Yolk | unsegmented | Oil globules | one oil globuleanteriorventralpigmented | |
| Rows on tail | ventral row | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Anus is close to the posterior end of the yolk sac. The pelvic fin, which develops early in @T.vipera@, has not yet appeared. | ||||
Post larvae
| Striking feature | other | |||
| Striking shape lateral | normal (not striking) | dorsal | normal (not striking) | |
| Striking feature | other | |||
| Shape of gut | triangular | |||
| Gas bladder early | invisible | late | invisible | |
| Spinal armature early | opercular spines only | late | several different spines | |
| Pigmentation early | ||||
| Rows on tail | ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | ventral row | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | unpigmented | late | pigmented | |
| Peritoneum | covered with melanophores | |||
| Pectorals | normal | |||
| Pelvics | strikingly large or elongated with melanophores | |||
| At 6.5 mm, spines develop on the preoperculum, at 12 mm, there are 5 spines and two melanophores above the eye, several occipital melanophores, two on the well-formed first dorsal fin, and 10 in the ventral postanal row. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of myomeres | 40 | 266 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | 3.5 | Jan | Feb | Mar | Apr | |
| min | 2.8 | 80 | May | Jun | Jul | Aug |
| mod | 3.2 | Sep | Oct | Nov | Dec | |
| Water parameters Metric characters |
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