if your really interested in getting an explanation you could send that photo to the ministry of enviroment ..I call them occasionally about our toxic fish here in our great lakes...you know the guide to eating ontario sport fish...that is not the best read for most great lakes anglers...ya the content is not good..
anyway there is an email for questions about fish contamination at
fishguide@ontario.ca
you can also call them at 1-800-820-2716...sometimes you have to leave a message and they will call ya back and chat...they are a bit under staffed
I suggest using latex gloves while handling something like that...
the good news is I checked my 2017 guide for ya and your in luck ...the guide reccomends you can safely eat 2 meals of largemouth bass per month
a meal or portion size is 8 oz raw weight.. that quote is for largemouth length for fish just under 14" to just under 18" ...
I should add that stomp & waverunner are right...I wouldn't eat the bass that contained that glob of brown meat...
The toxins in our fish are not so easy to identify, as we visually can't see them...are they a health risk... our province thinks so...as they have spent millions of precious tax dollars on providing the guide to help fishermen decide to make healthier choices on the fish we catch & keep to feed our familys...I can remember way back when our government tried to inform us by offering the free guide at the LCBO & beer stores..hey you cant fool the government..they knew we were drinkin beer & cleanin fish...now its to expensive.. so you can read the guide online or call them for a paper copy..ya its free...just like our health care.lol...seriously the correlation is preventitive...
ya last quote...lake ontario toxins in fish location are very similiar to lake erie contaminated fish...the further east you go the lesser toxins in fish...the further west you go..well ya its more..and its been that way for a long time...