If you see schools of small fish, you might want to watch out.

Fishermen off New Hampshire learned that lesson the hard way when a humpback whale breached onto their boat, tossing them into the water.

The video of the whale incident off Portsmouth went viral on Tuesday after 16-year-old Colin Yager captured it on camera.

“It was just completely unreal,” the Mainer told the Herald about the wild whale encounter from earlier in the day. “I never would have thought anything like that would happen right in front of me.”

The two fishermen who were sent into the chilly water ended up being fine after Colin and his brother Wyatt, 19, helped rescue the pair.

“They were totally shocked at first,” Colin said. “It’s hard to wrap your brain around it.”

About four other boats also rushed to the fishermen who went overboard.

The Yager brothers had been having a phenomenal day catching monster striped bass before the chaotic whale episode.

Colin said he’s going to be looking out for big pogie schools in the future.

“If you’re ever around a school of pogies and you see a whale, give it plenty of space,” Colin said.

A couple summers ago, a humpback whale breached onto a small boat off Plymouth’s White Horse Beach. Officials urged boaters to give whales space following that incident.

The U.S. Coast Guard’s Northeast office on Tuesday received a “MAYDAY” for the boat that capsized due to the whale breach.

“The occupants were ejected from the vessel as the boat capsized,” the First Coast Guard District posted. “Sector issued an urgent marine information broadcast (UMIB); they directed Coast Guard Station Portsmouth Harbor to launch. A good samaritan recovered both individuals from the water. No injuries were reported.”

The boat crew from Station Portsmouth reported that the whale appeared uninjured.

“We are grateful to the good samaritans for taking such quick action to rescue these two individuals. Bravo Zulu!” the First Coast Guard District posted. “We urge the public to practice safe seamanship. If you spot a whale, please report it to your local USCG command center: Northern NE: 207-767-0320 Boston: 833-449-0539 Southeast NE: 508-457-3211.”

Several species, including humpback whales, inhabit the New England coasts in larger numbers during the summer. They come to feed on sand lance, small schooling fish, and other types of prey.

Whale video to download