Country singer Dierks Bentley got in trouble with authorities after he and fellow country star Luke Bryan boasted on stage about some fishing they did in Colorado.

The Denver Post reports that concertgoers at a three-day music festival in Buena Vista alerted Colorado Parks and Wildlife authorities by calling to check on whether Bentley and Bryan had obtained fishing licenses. Apparently they hadn’t.

The calls got the department’s attention, but weren’t enough on their own to generate fines. But then Bentley posted a photo of himself with a prize catch — you can see it below.

The paper quotes Colorado Parks and Wildlife spokesman Bill Vogrin saying: “We didn’t have any proof until Mr. Bentley posted a photo on his Instagram.”

Vogrin also commented on the concerned concert attendees who called in, saying: “It was very heartening that they cared that much.”

Bentley wound up being hit with a fine of $139.50, which he reportedly paid immediately.

Vogrin commented, talking about Bentley: “He was as nice as can be. We welcome him back anytime to fish, as long as he gets a license next time.”

Luke Bryan, who did not post photos of himself with fish, was apparently not fined, but Vogrin noted that his case is “under investigation.”

Here’s the Twitter post that sealed Bentley’s fate …