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Larvae Information Summary for
Anguilla rostrata
| Main Ref: | Fahay, M. 1983 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | ||||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | Mid-Atlantic Bight (estuaries); Delaware Bay (USA) | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | ||||
| Other melanophores on tail | ||||
Post larvae
| Striking feature | other | |||
| Striking shape lateral | eel-like | dorsal | ||
| Striking feature | other | |||
| Shape of gut | tube-like | |||
| Gas bladder early | late | |||
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Peritoneum | without melanophores | |||
| Pectorals | normal without melanophores | |||
| Pelvics | normal (i.e. small or absent) without melanophores | |||
| Leptocephalus larvae (50 mm TL); gut straight and long (about 70-75% TL), shortens at metamorphosis; lower jaw protrudes in glass eel and elver. Tail sharply pointed. Body compressed except for head; maximum depth at midpoint of body 16% of TL; preanal length 74% of TL; head 8% of TL; liver long and narrow, between myomeres 12 and 35. Dorsal fin origin at myomere 61; 9 myomeres between dorsal and anal fin origins (Ref. 39467). Larval teeth prominent, 16 in the left side of upper jaw (Ref. 39467). 'Glass eel' stage: 52 mm TL, dorsal, anal and caudal fins developed; myomeres 109. A few chromatophores scattered on body; adult teeth developing (Ref. 39467). Pigmentation: none, except in the eye, until glass eel stage. Sequence of fin formation: pectoral fins form late; pelvic fin absent. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of myomeres | 111 | 102 | 68 |
| 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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