Aquatic plant managers are occasionally asked why they spray while fish are spawning because there is a belief that spraying during this time will kill bedding fish and therefore cause an unsuccessful spawn. Dr. Mike Maceina, fisheries professor (retired) at Auburn University and professional fisheries biologist, developed a study to determine how applying herbicides during the spawn impact nesting. The study concluded “the production of young bass was the same in ponds sprayed with water as those sprayed with the herbicide”. Dr. Maceina’s study results were published in BASS Times.
Spring is also the time of year when aquatic plants are actively growing and most susceptible to herbicides. Treating vegetation during this time of year actually reduces overall control efforts and the amount of herbicides used because there is less aquatic plant biomass and treatments are more effective.