Dissolved oxygen (DO) at probably 2 or 3 ppm is needed on the bottom at the mud water interface for mayflies to survive year round. A few hours with too low of DO on the bottom will eliminate all mayflies in that benthic zone. The annual temperatures which determine the heat units per year will determine how long the life cycle is for burrowing mayflies. Their life cycle can be one year in warmer areas or up to 24 months in colder enviornments.
Last edited by Bill Cody; 11/15/11 07:31 PM.
