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Larvae Information Summary for
Trisopterus minutus
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 2.4 | 2.3 | ||
| Preanal L. % TL | 46.4 |
| Place of development | planktonic | |||
| Larval area | to be filled | |||
| Yolk-sac | ovoid | Ref: | ||
| Yolk | unsegmented | Oil globules | no oil globule | |
| Rows on tail | dorsal + ventral row | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
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 | invisible | late | invisible | |
| Spinal armature early | no spines | late | no spines | |
| Rows on tail | dorsal + ventral row | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Rows on tail | dorsal + ventral row | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Peritoneum | covered with melanophores | |||
| Pectorals | normal | |||
| Pelvics | normal (i.e. small or absent) | |||
| At a length of about 6 mm, a few melanophores appear above and below the urostyle, which is still straight. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 48 | 44 | 46 | 65 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | 4.5 | Jan | Feb | Mar | Apr | |
| min | 4 | 64 | May | Jun | Jul | Aug |
| mod | Sep | Oct | Nov | Dec | ||
| Water parameters Metric characters |
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