All fish can't kill you in shallow water!
Just make them come in shallow water and kill them with bare hands!
These f#cking creatures can't shock you in shallow water
Make sure they are very near to the beach and kill them!
If you hate Cnidaria as much as I do, get a raft and a blood stalker. Using the blood stalker to drag them out of the water is an instant kill, their webs will only reach to a certain depth however. So, either lure them to the top of the water or use a ranged weapon for any left over.