A stomach pump is a great way to learn what the fish are feeding on. Easy to use and doesn't harm the fish.
- Fill the bulb full of water
- Cradle the trout gently upside down
- Slide the tube into the trout's mouth and squeeze out the water before sliding it down the fish's throat.
- Keep the bulb depressed while you gently slide the pump into the fish's throat. Stop when you feel resistance.
- Let go of the bulb and slide the pump back out. The contents will come with it.