Question:
How fast do abalone grow?

Answer:
Abalone are relatively slow growing. Tagging studies indicate northern California red abalone take about 12 years to reach seven inches, but growth rates are highly variable. Abalone grow nearly one inch per year for the first few years, and much slower after that. It takes about five years for red abalone to grow from seven inches to eight inches. At eight inches, growth rates are so slow it takes about 13 years to grow another inch. Slow growth makes abalone populations vulnerable to overfishing since many years are needed to replace each abalone taken.