Larvae Information Summary for
Harengula thrissina
| Main Ref: | Watson, W. and E.M. Sandknop 1996 | |||
Yolk-sac larvae
| min | max | mod | Ref. | |
| Length at birth (mm) | 3.7 | 35601 | ||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | California Current region | |||
| Yolk-sac | ovoid | Ref: | ||
| Yolk | segmented | Oil globules | one oil globulecentralventral | |
| Rows on tail | no rows | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Melanophores on head + trunk | melanophores on trunk | |||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | ||
| Striking feature | none | |||
| Shape of gut | tube-like | |||
| Gas bladder early | pigmented | late | pigmented | |
| Spinal armature early | late | |||
| Pigmentation early | ||||
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | ventral row | |||
| Other melanophores on tail | tail partly covered with 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 | |||
| 4-6 myomeres between dorsal fin insertion and anal fin origin; moderate to heavy pigment over notochord tip through early postflexion stage; pigment dorsally on head and dorsal margin beginning early in postflexion stage. Pigmentation: Yolk-sac: on dorsum initially, moving to gut by end of stage except remaining around notochord tip. Preflexion: dorsally and ventrally on notochord tip; on cleithrum at pectoral fin base; on isthmus, dorsolaterally along sides of gut; over gas bladder; on ventral margin of gut posteriorly from gas bladder except none onlast 10-20%. Flexion-postflexion: at nape by 6.6 mm, extending caudad along dorsal margin, becoming deeply internal and reaching urostyle by 14 mm, pair under brain by 6.6 mm; in otic capsule by 9,5 mm; increasing on isthmus and cleithrum after 9.5 mm; over foregut by 9 mm; posteriorly on lateral midline by 14 mm, extending cephalad; on ventral margin of tail by 14 mm; on dorsal fin base by 14 mm; proximally on caudal fin rays; internally on urostyle and hypurals. Sequence of fin development: caudal, dorsal, anal, pelvics, pectorals. | ||||
Meristic characters
| min | max | mod | Ref. | |
| Total number of myomeres | 40 | 43 | 35601 |
| 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 |