Photographing bull trout needs to be careful and quick, according to Montana Fish, Wildlife and Parks regulations. The state handout on bull trout states "It is legal to photograph your trophy catch, however, it is essential that you minimize or eliminate the need to take the fish out of water. Ferguson and Tufts (1992) showed that nearly 40 percent of exhausted trout that were kept out of water for 30 seconds died; it rises to almost 70 percent if they are kept out of the water for 60 seconds. Have everything ready to take a photo before you handle the fish and try not to squeeze the fish or put your hands in its gills. Release the fish as quickly as possible."