How was he able to fish for money when he came initially on a visitor visa?
"Once the motivated young man turned 21, he had saved enough money for a round-trip ticket to Dallas, Texas. And more importantly, he felt he had the skill to fish against the best fishermen in the United States at the 1991 BASS Invitational on Sam Rayburn Reservior.
Tak lands in the USA
With an international driver's license and $2,000 in his pocket, Omori rented a car after landing at DFW airport and drove to Rayburn. "It was really confusing, because the steering wheel was on the wrong side of the car and everyone was driving on a different side of the road. It took some getting used to," Tak remembers. Luckily, he had time to practice."https://www.bassmaster.com/hiros-journey
That would be illegal per his visa, assuming he came here on Tourist/Business Visitor Visa......