just tamed one about level 15 or something with around 20 cooked prime meat, you can find a few around the little island in the south-east corner of the map. they'll usually have a few ichthy and mantas following them, the mantas will all attack you when you feed it, and once you kill them be careful to not accidentally feed your meat to one of the ichthy instead. the maximum depth the basil swims to is about the maximum depth you can safely swim to without drowning, you can swim down by yourself with no mount or scuba gear, feed the basil once with half air left, then swim up and breath right when you're about to start drowning. it's pretty terrifying. please bring a mount that swims faster than you or scuba gear or level up your air or something. don't tame with regular meat or fish if you're trying to tame the stupid way like i did, but if you want to tame it with lots of meat or fish make sure you can stay down there for longer.
Okay, so I saw one in a river opening on Crystal Isles. I thought the mantas attack you as soon as you go near. So I slowly approached the tail near the river bank. The mantas didn’t agro on me, I thought I was just far enough away. No. Oh no no no noooo. It turns out the mantas ATTACK the second you feed it. Please don’t do what I did haha
How to tame: Basilosaurus. You will need: Icthy with saddle, a nearby leed and a basilo to tame. Step 1: get on your icthy and scrape meat off the leed until you get prime fish meat. Step 2: find your basilo and put the meat in your hot bar. Step 3: feed meat to the basilo, don't worry, the mantas won't aggro on your icthy. TIP: The interval from 1st to 2nd feed take awhile, but after that it goes pretty quick, so after that interval, be on your guard. Step 4: Keep feeding until it's tamed. TIP: Before you start to passive tame it, bite it once, the mantas will swim away, then start to passive tame, you can still passive tame. Or you can bite it during 1st to 2nd interval. Step 5: there is your very own basilo! lead it back to yoir base and name it.
A living oil mine and immune to jellyfish and someone who likes to ignore the hug of the Tuso . Yup definitely worth taming and for some of you who don’t know how to tame this kind of Dino then this is how you do it
Step 1: put the item you will use to tame in your hot bar
Step 2: get close to the Dino then tap the item to feed it then keep feeding it until it tame up
I am telling process because I had problems passive taming when I was a beginner