So let me get this right.......you've read a bunch of reports on aquatic bio and are majoring in it. Suddenly you have all this knowledge right? Wrong, we go through this all the time at work with new engineers coming out of UT or A&M or any number of big name universities from around the country. They studied something in school and they think they know everything. Well, they don't.
Neither do you, what you "know" is info from a report that some random joe schmoe wrote down and published on a local website. That person likely has his/her own agenda and the research is sponsored by some "group" wanting the research to go in their favor. So what do you think the conclusion will be?
Now you got two guys (hogginhank and jimbo) with a combined amount of 96 years first hand experience with grasses in lakes telling you all that fancy research is basically wrong. Hogginhank even has first hand experience with it on Canyon Lake. Now you're gonna sit here and try and feed everyone this "grass in lake is bad" bit. Gimme a break kid. Is that why TPWD is now hosting carp tournaments on Conroe,cause they ruined the grass and the fishing? How about Stillhouse where the floods wiped out the grass? At one time that lake was taking 35-40lb sacks to place in a tourament. Now you're lucky to catch a 5lber. By your thinking, with the grass gone they missed the 5-10 year window where grass would quit improving things and begin a decline in lake quality, right? So fishing should be even BETTER on Stillhouse, because they missed that window. Yet it has dramatically decreased. But hey its in a report, so maybe the caliber of fisherman has dwindled?
Argue all you want, its clear to anyone that grass is good. TPWD is in the process of killing all the grass in Lake Austin. We have had a record number fo share a lunkers pulled from there in the last two years. Make note, once that grass is gone that lake will be [censored]. No more big fish, no more clear water to please the lake front property owners, no more revenue for the city parks due to both of these things. Head down to Florida too. Theres lakes all over that have been covered with grass for a lot longer than 10 years and they produce monster bass still.
And the whole CO2 bit.....explain why I can catch bass in the grass at night. A fish won't sit in low oxygen water for long. With the amount of grass on some of these lakes it should be offgassing above the water surface. That would make some of the lakes deadly to be on at night. If it does offgas CO2 its in minute levels that effect nothing.
A word of advice before you leave college for the real world. First hand experience trumps book knowledge everytime.......everytime. Don't enter your first job with a know it all attitude, it impresses no one.

Eh, obviously opinions arent going to change here so i wont waste the time. Besides, as [censored] as hydrilla would be, zebra mussels would be far worse for canyon since most of the lake is hard surface. But to clear up assumptions, Im not some rich lakeside property owner, nor do i really give a flip about lakeside property owners, i have been to canyon lake and ive done multiple dives in canyon lake, also ive seen multiple 8lb+ bass while diving so if yall bass fishermen would stop crying about lack of vegetation and spend more time learning the lake then maybe you could catch a few of them, ive seen a couple 8lb+ bass hanging off of sunken logs multiple times. I fish mainly for catfish but occasionally get in the mood to catch other species, ive helped in multiple field studies for dissertations on invasive species, its not like ive just read about it and thats it. Most of the "the lake fixed itself" or "nature sorted it all out" mentallity is a bit insulting to TPWD and the army corps of engineers who do a ton of work to maintain our lakes ecosystems, most of which people never see or notice them doing it. Most lakes are surveyed at least once a year with a recommended action plan.

My arguement wasnt about fish quality but lakes ecosystems. Obviously if lakes full of grass had terrible ecosystems it would have a major impact on fish of all species. Yet its clear that the opposite is true. I have yet to see a lake "die" because of grass in it.