| FishBase |
Larvae Information Summary for
Esox americanus
| Main Ref: | Jones, P.W., F.D. Martin and J.D. Hardy Jr. 1978 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 6.1 | 5.8 | ||
| Preanal L. % TL |
| Place of development | in close association with substrate | |||
| Larval area | Mid-Atlantic Bight | |||
| Yolk-sac | ovoid | Ref: | ||
| Yolk | Oil globules | |||
| Rows on tail | ||||
| Other melanophores on tail | ||||
| Melanophores on head + trunk | melanophores on head | |||
| By 9.0 mm TL, mouth fully developed. At 10.0 mm TL, gut partially formed. Pigmentation: At 7-8 mm TL, black eye pigment present. Yolk-sac larvae stage duration: 10-14 days. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | normal (not striking) | |
| Striking feature | none | |||
| Shape of gut | ||||
| Gas bladder early | late | |||
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Rows on tail | ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pectorals | normal without melanophores | |||
| Pelvics | normal (i.e. small or absent) without melanophores | |||
| Snout elongates with growth, still quite blunt at 11.6 mm, more elongate at 17.8 mm. Cleithrum and outline of auditory vesicles visible; gill rakers formed and visible through opercle at 11.6 mm; choroid fissure still evident at 17.8 mm. Dorsal finfold extended forward beyond level of ventrals at 11.6 mm, wholly behind ventrals at 17.8 mm. Urostyle oblique; caudal finfold bilobed, adjacent to, but not continuous with, dorsal and ventral finfold at 17.8 mm. Pigmentation: At 11.6 mm, conspicuously darker below than above; lower fourth of abdomen clear except for heavy, mild-ventral dark stripe. Dorsolateral regions with large brown stellate chromatophores; a mid-dorsal light stripe lacking chromatophores; sides of tail posterior to anus with light and dark chromatophores; a dark stripe along snout and continuous behind eye to pectorals. At 17.8 mm, abdomen conspicuously lighter; mid-ventral line reduced; number of dorsal chromatophores increased and concentrated over brain and in dark band between pectoral fins. Sequence of fin development: Pelvic buds formed at 11.6 mm; incipient rays in caudal and anal at 11.6 mm, in dorsal by 17.8 mm. | ||||
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | Sep | Oct | Nov | Dec | ||
| Water parameters Metric characters |
| Back to Search |