Don - aquatic treatments this late in the season are a questionable proposition. I'll offer a non-specific answer: "It depends".
WHAT is the specie? HOW BAD is it? WHAT is the objective? Is it a situation that cooler temperatures and shorter daylight hours will naturally abate within a few more weeks? Etc. etc.
I need more info in order to answer the question more appropriately. Since you're in Bellaire, give me a call if desired. Busi Ph:(713) 464-3391
Regards,
Kelly

PS: Thanks for the trout-stocking suggestion. I know Paul very well and had already emailed him with the same question - was awaiting his reply.


Kelly Duffie
Cypress, TX