Quinn, T.P. and C. Groot. 1984. The effect of water flow rate on bimodal orientation of juvenile chum salmon, Oncorhynchus keta. Animal Behavior 32:628-629.

Region: PNW Species: Chum

Study Objective: Explore the role experimental techniques play in generating bimodal orientation behavior.

Results: Chum fry, previous found to have unimodal compass orientation, demonstrated bimodal orientation in tests in a circular tank under varying flow rates. Unimodal orientation was demonstrated in high flow experiments and bimodal orientation was demonstrated in instances of reduced flow. Care must be taken to properly interpret the possible reasons behind demonstrations of bimodal orientation under different flow rates.