Wanna get biotoxin without risking your Dinos? Find a school of these and get close enough to hit with a crossbow and aggro them - they’ll slowly swim closer. Draw them to a shore where you can stand and see them on the surface then shoot them with a gun. Once dead, check and make sure you didn’t miss any then harvest them with your axe. Gives about 15-18 biotoxin per jelly. Biotoxin spoils in an hour on you, 4hrs in a dino and 8 in preserving bin. Good luck!