Another possibility is that the female releases an airborne stimulant.

At this point the female will release approximately five dozen clear eggs, which are immediately fertilized by the male.

Virgin females release a pheromone which the males search for.

Through the act of mating, the female releases an egg and is often fertilized on the first attempt.

At that point the female releases the eggs into a rocky area for the fry's protection, and leaves them there on their own.

Each female releases eggs in batches every 3 to 5 days for approximately 1 month.

The females release yellow eggs which are fertilized in the water column.

The female releases a scent into the water which the males can detect.

Spawning mainly occurs in the spring and a large female may release about 20 million eggs into the water column.

After the female releases two to three million eggs, males fertilize them.