I fish the west Boca Raton canals in south Florida and I noticed a bunch of carp and some otters in one of the canals. Will this affect the fishing in this canal? I know there’s largemouth in the canal as well as alligator gar. Any light on this situation would be a big help

Otters can destroy a fishery. Shoot 'em. 

Dang. That’s all I needed to know. Thank you

Otters will effect a small body of water and the fish population.  Don’t kill them or you could be faced with a healthy fine.  They will kill the gar and carp also probably before the bass.  Easier to catch.