Trout, Salmon and the Evening Rise: the Barometric Breakthrough

Book Review: Andrew Bett's "Trout, Salmon and the Evening Rise: the Barometric Breakthrough"

First published in Fly Fishing & Fly Tying magazine, July 2006

During my days as a full-time advertising writer, I once worked with an art director who liked to wear a T-shirt to client presentations printed with the words We've got graphs and charts to back us up - so get lost. (Or a punchline to that effect... this is a family magazine, after all).

It's clear that the author of this book rarely feels the need to challenge his own audience in such terms. But once you've worked through the charts and graphs that form the fascinating core of Andrew Bett's research, you're left with the definite feeling that he could probably get away with it, if he wanted to.

Essentially, his theory says that many water-dwelling organisms, including aquatic invertebrates and the fish that feed on them, are highly sensitive to even the slightest changes in atmospheric and hydrostatic pressure - right down to half a millibar's shift in either direction.

For tiny, non-collectively-communicating invertebrates, this presents a compelling evolutionary rationale. By linking rising pressure to light-attraction, whole populations can time their

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