Whoever said fishing is relaxing hasn't been to the new Bass Pro Shops in Odessa, Texas ... where a huge brawl broke out to christen the opening ... all caught on video.
The Odessa Police Department tells TMZ ... they responded to the disturbance Saturday at approximately 2:52 PM. Cops said two men started arguing while waiting in line for the restroom. The incident then turned physical.
It's unclear what exactly started the argument ... but in the video, you can see 4 men paired off in separate tussles, and then more guys start running in.