What makes a good or bad fish shelter? Using a range of techniques, including measuring water velocity, volume, light permeation and entrance area we investigated natural fish shelters (woody debris, roots, wads, boulders, undercut banks, etc.) and from analysis of our findings discovered the best and worst natural fish shelters.
Jim Lovell is the founder of Confluence in Montana, USA and shares our passion for aquatic and fish management and science.
The recording of sequences involves long observations of the watercourse and helps to refine knowledge of the aquatic environment and its renaturation techniques, as shown by these images taken as part of a partnership within the United States.