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.
The depths you choose for your lake will largely depend on the fish you intend to stock it with later. Temperature-wise any water that remains over 20 degrees Celsius over the Summer is ideal for coarse fish, a cooler water that does not go above 20 degrees Celsius in Summer is better for trout.