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Larvae Information Summary for
Argentina sphyraena
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 7.6 | 7 | 7.25 | 37 |
| Preanal L. % TL | 71 | 72.6 | 71.8 |
| Place of development | planktonic | |||
| Larval area | to be filled | |||
| Yolk-sac | elongated pigmented | Ref: | 37 | |
| Yolk | segmented | Oil globules | one oil globuleposteriorventralpigmented | |
| Rows on tail | no rows | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Tail with one dorsal melanophore near the caudal end. Number of preanal myomeres: 36; of postanal: 17-19. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | eel-like | dorsal | normal (not striking) | |
| Striking feature | none | |||
| Shape of gut | tube-like | |||
| Gas bladder early | invisible | late | invisible | |
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | pigmented | late | pigmented | |
| Peritoneum | with row of melanophores | |||
| Pectorals | normal without melanophores | |||
| Pelvics | normal (i.e. small or absent) | |||
| Appearence of opercular melanophores. The pigmentation consists of six groups of melanophores along the upper surface of the alimentary canal and on the postanal portion. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of myomeres | 52 | 262 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | 8 | Sep | Oct | Nov | Dec | |
| Water parameters Metric characters |
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