Red abalone, Haliotis rufescens
Introduction: The red abalone, Haliotis rufescens, is a snail-like, univalve species of a very large edible sea snail; it is a marine gastropod mollusk in the family Haliotidae. Historically, red abalone has been the most important commercial species of abalone that was harvested in the California while in the present; it is the only species of abalone still legally supports the recreational free-dive. This species may live for 20 years.
Distribution and habitats:
Geographic range: The red abalone can be found along the west coast of North America, from southern Oregon to Baja California, and Mexico. Due to overfishing, the stocks of red abalone have very much declined along the Pacific coast.
Habitat: The…show more content… Reproduction and life history: This species becomes sexually mature at the age from 4-6 years, and they spawn throughout the year with a peak period. The sexes of this abalone are separate. The gonads of the females are green and those of the male, yellowish. During spawning, abalone broodstock broadcast their eggs and sperm into the ocean. Males eject sperm and females eject eggs. Fecundity as measured in the number of gametes produced is directly related to female size; a large female may have over 12 million ripe oocytes whereas smaller/younger females will produce less number of eggs.
If the temperature is optimum (14-16 o C), red abalone larvae hatch about one day after fertilization, develop into a morphologically mature veliger larvae after three days and are capable of metamorphosis after about seven days. Red abalone settlement and metamorphosis are by compounds released from coralline algae, which the young abalones graze upon. Within 2 months, the larvae develop into small sized adults while by the age of 1 year, an abalone reaches about 25 mm long, and within 4 years it reaches sexual