The relationship between the brown trout and the Mayfly is an intricate one. This trailer from MollanMedia captures footage of the maturation of both species, documenting the way in which their biological paths are interwoven in the food chain.
There's some amazing footage here, including video of the first heartbeats of a brown trout inside the egg.
The life cycle that occurs every season on the river is likely far more complex than many anglers appreciate, and is fascinating to witness.
Some amazing underwater footage of feeding brown trout in Norway here.
Check out more from the blog "Way Upstream" here.
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