Abstract
Induced spawning of Haliotis coccinea canariensis of 29–49 mm shell length was attempted by adding hydrogen peroxide and tris(hydroxymethyl)aminomethane to the seawater. The best spawning rate was obtained at H 2O 2 concentrations of 2, 4 and 8 mmol/l for males and 4 mmol/l for females. The relationships between fecundity and shell length, and between fecundity and body wet weight are exponential and linear respectively. The mean diameters of the fertilized eggs and yolk are respectively 103 and 80 μm. The colour of the eggs is violet. Hatching of trochophore larvae took place 21 h after fertilization at 15°C. At the same temperature veliger larvae settled after 8 days.
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