Gut transit rate in Atlantic salmon ( <i>Salmo salar</i> ) exposed to optimal and suboptimally high water temperatures

The gut transit rate of ingested feed in fish affects the utilization dietary nutrients; however, influence water temperature, remains underexplored Atlantic salmon (Salmo salar). present study quantified four distinct regions gastrointestinal tract (stomach, pyloric caeca, small and large intestine) post-smolt at two temperatures; 11 20°C, by feeding a diet incorporated with Ballotini beads. A determination relative total bead density each region was assessed for 48 h, post-feeding. clear inverse relationship between stomach intestine recorded both temperatures. However, subjected to 20°C faster compared 11°C intestine. caeca appeared unaffected temperature. re-iterates positive temperature also critical function controlling gastric fish. This information may be used improve strategies aimed enhancing nutrient through increased understanding commercially important species.