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Larvae Information Summary for
Gasterosteus aculeatus
| Main Ref: | Morrow, J.E. 1980 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 4.5 | 4.2 | ||
| Preanal L. % TL |
| Place of development | in open nest | |||
| Larval area | Western Europe (British Isles); North America (Alaska); Northwestern Pacific (Japan) | |||
| Yolk-sac | spherical | Ref: | ||
| Yolk | Oil globules | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Yolk is absorbed at 5.0-6.0 mm. Oil globules are present in the yolk sac. Pigmentation: Pigment absent on lateral line; present on dorsal line. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | ||
| Striking feature | none | |||
| Shape of gut | elongated | |||
| Gas bladder early | late | |||
| Spinal armature early | late | |||
| L 1st feeding | Ref. |
Months of presence of larvae
|
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| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | Sep | Oct | Nov | Dec | ||
| Water parameters Metric characters |
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