SeaLifeBase |
Main Ref: | Shaw, W.N. 1986 |
max | min | mod | Ref. | |
Length at birth (mm) | ||||
Preanal L. % TL |
Place of development | planktonic | |||
Larval area | British Columbia, Canada | |||
Yolk-sac | Ref: | |||
Yolk | Oil globules | |||
Embryos develop into trocophore larvae 12 hours after fertilization, length varied from 0.06 to 0.08 mm. A ciliated velum develops and helps the larva swim and maintain itself in the upper part of the water column. |
Striking feature | ||||
Striking shape lateral | dorsal | |||
Striking feature | ||||
Shape of gut | ||||
Gas bladder early | late | |||
Spinal armature early | late | |||
Trocophore larvae develops into veliger in the next 24 hours. The veliger develops an umbo (prodissoconch) and may reach a length of 0.26 to 0.28 mm in 2 weeks. It develops a foot and an eye spot, moves to the bottom, and searches for a suitable surface to settle. Once a suitable surface is found, the larvae undergo metamorphosis and attach to the surface by secreting byssal threads. Depending on food supply and temperature, the planktonic larval stage generally lasts about 3 weeks. |
L 1st feeding | Ref. | Months of presence of larvae | ||||
max | Jan | Feb | Mar | Apr | ||
min | May | Jun | Jul | Aug | ||
mod | 0.15 | 104667 | Sep | Oct | Nov | Dec |
Water parameters Metric characters |
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