Generalized life cycle of the northern abalone: Male and female abalone spawn in April to August. Spawning may not occur every year. Mass fertilization occurs in the water column. Fertilized eggs hatch within one day into free-swimming larvae which remain in the plankton for 2-11 days before settling. Planktonic larvae are dispersed by current. Larval settlement may be triggered by chemical secreted by the encrusting red algae Lithothamnion and related genera, typically found in areas grazed by sea urchins or abalone. Following metamorphosis, juvenile abalone are light sensitive and seek habitats in cracks and underside of rocks. As the juveniles grow, they migrate up to preferred food source, often kelp. Abalone may live to 15 years and reach a maximum shell length of 150 mm.
Distribution: scattered, mostly found along outer coast.
Habitat: attach to firm (rocky) substrate in waters with high salinity and some wave or current action; planktonic larvae dispersed by currents; tend to settle in recently grazed areas, attracted by chemicals secreted by colonizing algae; adults often colonize kelp beds.
Tidal elevation: intertidal to over 100 m subtidal depth; optimum is subtidal, from 0 to 6 m depth.
Food: herbivore; very young feed on diatoms and attached microalgae; juveniles feed on attached algae, adults feed on kelp fragments.
Predators: octopus, sunflower star, wolf eel, and sea otter in subtidal; man, birds (oyster catcher), otter and mink in intertidal.
More rapid growth and larger size in beds of bull kelp (Nereocystis leutkeanana) and giant kelp (Macrocystis integrifolia); legal size of 100 mm is reached in 6 to 10 yr; sexually mature at about 50 mm
Only commercially exploited snail in B.C.; Small commercial, native and sport fisheries closed in 1990; 1986 commercial catch was 52 t valued at $0.7 million.
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