If you want to tame one of these at level 20-30s I recommend you to have an ichthyosaurus, crossbow, and minimal 6 tranqs and 1 arrow. They may be dangerous in water but that's if your tames are slow. My strategy is to lure them to land I usually shoot one of them mount my ichthy and lure it to a safe area where no Dinos are around. if you're searching on swamp areas don't worry predators like kapros and sarcos won't attack you while you're mounting your ichthy. After you knock it out feed it fish meat they do not want normal meat. You ran out of fish meats? Kill some megs with your ichthy megs are easy 50+ fish meat don't be intimidated by them they only attack land creatures same with most water/ semi aquatic creatures. Hope this helps you!

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