I remember me and my friends set up a sort of priority list. (mixed in with some general advice from me)
Flyfish get absolute top priority. it's agreed I throw a Splat Bomb in the RIGHT rocket bin. if im not there, the first person who arrives at the Flyfish throws it in the right bin. We typically don't use "This way!" very often at profreshional because of the sheer amount of bosses, but if there's a Flyfish, you bet your butt we're gonna yell "This Way!". Those things ruin games.
Drizzlers get second priority because how quickly they can ruin games with their Inkstorms. it's a good idea to back up to a point where they will shoot their balloon out, and youll be able to shoot it back at them for an insta-splat. If you cant get a good position, just get up close and splat the Drizzler the moment it exposes itself. It will probably get off at least one Inkstorm, but one is better than a ton.
Stingers need to get cleared out ASAP. Theyre particularly annoying cos of that semi-aimbot Sting Ray of theirs. Steelheads are very annoying if your long range weapon(s) is/are screwing off doing something else.
Don't fight Scrappers in narrow areas if youre alone.
Also just stay away from the water if there are lesser Salmonids around. If there's an egg on the VERY edge of the water, clear EVERY lesser Salmonid from the immediate area, cos they WILL boop you in the water, and that just sucks. Scrappers can boop you in the water too, so be mindful about those too.
Don't forget Sting Ray pierces EVERYTHING. It can push back the Mothership when it closes in on the egg basket, and it can splat the Flyfish if you aim in the center of the flying device, Scrappers, Steelheads (yes, even with body shots), and Drizzlers. So if you got the Sting Ray, just remember it's FAR from useless in Salmon Run. Save it for wave 3 for when things get hairy, though. ;)