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Larvae Information Summary for
Engraulis mordax
| Main Ref: | Kucas, S.T. 1986 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 3 | 2.5 | ||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | California | |||
| Yolk-sac | elongated | Ref: | 6888 | |
| Yolk | segmented | Oil globules | no oil globule | |
| Rows on tail | ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Yolk comprises 53 % of the larval dry weight. The yolk sac is used up in about 36 h, at 3.5-4.0 mm SL (Ref. 265). The larvae are transparent and threadlike, with well-developed olfactory and lateral line organs. Mouth is terminal. Pigmentation: few form dorsolaterally on gut and on ventral margin of tail mid-way through stage (Ref. 35602). | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | short and/or deep | dorsal | compressed | |
| Striking feature | none | |||
| Shape of gut | elongated | |||
| Gas bladder early | pigmented | late | pigmented | |
| 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 trunk | |||
| Pigmentation late | ||||
| Rows on tail | ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| 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) without melanophores | |||
| Isthmus pigment present; dorsal and anal fin placement (0-2 myomeres between fins); midventral melanophores on intestine usually staggered, not single as in osmerids, and usually not as evenly paired as in C. pallasi.. Pigmentation: isthmus; row of melanophores along dorsal surface of gut continuing along ventral body midline; ventral pigment on gut beginning about midway. Sequence of fin development: caudal, dorsal and anal, pelvics, pectorals. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of myomeres | 47 | 43 | 46 | 265 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | 4 | 265 | May | Jun | Jul | Aug |
| mod | Sep | Oct | Nov | Dec | ||
| Water parameters Metric characters |
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