First: Most importantly you have to fish more, I say that because the more you fish the more opportunities you create to get your photos.
Second: Have your camera ready, I recommend shooting with a dedicated camera but even good photos can be made with your phone camera. If you can shoot with a DSLR or Mirrorless camera understand the lens is more important than the body. A good lens on a less expensive body will produce better results than the other way around. Shooting at larger apetures (smaller number like 2.8, 4, 5.6) create more pleasing photos, subject is in focus and background slightly blurred. Try shooting in Manual mode, learn your camera and you can control the results and ultimately create your own style of photography, youtube has limitless tutorials available.
Third: Composition is king, learn what makes a good photo as a great photo of a 10” fish makes greater lasting impact than a poor photo of a 24” fish. Do your best to implement the rule of thirds. Avoid distracting backgrounds. Shoot from different perspectives. Lastly, seek out leading lines and strive to generate a sense of depth in your images. Shoot more than just the fish and fisherman holding it. Simplify some of your photos, no busy backgrounds if possible. Think of the entire process involved and you can find many photos waiting to be seen. Casting, hiking to your favorite spot, sunrise, sunset, equipment, critters or just the flowing water. See if you can recreate that feeling you are experiencing in person with the person who views your photos.
Fourth: Fish with people who enjoy the experience. You can show the enthusiasm in your photos as well. Tell stories with your photos, look for ways to make the viewer become invested in the experience as well as just looking at it.
Fifth: Your camera is a tool, just like your rod and reel. Don’t be reckless but be adventurous. Low angles shooting up at your fishing partner, parallel shots with fish in the water being released etc.
Sixth: Photographers know when shooting in natural (sun created) light the best times to photograph are before and just after sunrise and sunset. Best thing about that is that is usually the best times to be fishing as well, so there you are!
Seventh: Respect your fish, we believe that when you are practicing catch and release you do your best to keep the fish in the water as much as possible. Our advice never even take the fish out of the water ever, to get your photo.Get camera ready, get your hands wet, gently but quickly position fish with it’s head still in the water, take your photos, and release the fish. Make it as stress free as possible. If you are keeping your fish then of course take your photo however you want.
Last thing, have fun, don’t stress yourself out trying to make the best picture everytime you take one. Relax, do all the prep work, practice taking the photos before fishing and know your camera like you know your rod and reel. Remember, the more you fish the more opportunity you have to make great photos.