More digging has resulted in a suggestion of three primary variables influencing rate of digestion: temperature, weight of food portion in the stomach, and fish weight.
It has also been suggested that duration of digestion may depend greatly on food composition and quality. This begs the question as to whether high protein feeds take longer to digest in cold temps, when compared to natural forage.
"Duration of Gastric Digestion in Fishes", V.B. Tseitlin
