When food enters the small intestine, bile travels through the common bile duct to reach the duodenum. Gallstones are hard deposits that form inside the gallbladder when there is too much bilirubin or cholesterol in the bile.
That said, there is a considerable consensus that all three major trout species (brook, brown and rainbow) begin to experience some level of stress at around 68Â°F (20Â°C), with that stress increasing rapidly as the temperature rises further.
Trout need cold (or at least cool), clean, high quality water with plenty of oxygen. They need either sufficient flow or sufficient volume of water to maintain the quality of the water. Your pond needs to maintain a temperature of at most 65 degrees F at the bottom of the pond in mid summer. Your pond needs sufficient depth so that in winter there is adequate oxygen in the water under the ice to keep the trout alive. In general, trout ponds in this area need about 8 feet of depth and a sufficient source of cold water (such as natural springs) to provide the conditions that trout need.