Honestly on lost Island these aren’t too bad. My recommendation if you want bio toxin would be to leave everything you have at your base and bring a crossbow and arrows, use a raft to get to the middle of deep water, make sure you have a pike or something to harvest them when you kill them. You can use scuba gear if you have lots of extra resources but prepare to lose whatever you bring and have a spare raft at home so you can retrieve your body.