Fish trophic levels in freshwater lake

Researchers report that 148 years of fishing records in Canada’s Lake Simcoe show that during a period of commercial fishing the mean trophic level of the catch declined, indicating depletion of high-trophic-level fish, and the mean trophic level began to recover when fishing switched from commercial to recreational; fish stocking and introduction of invasive species also altered trophic level indicators in the lake, according to the study.

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Article #19-08272: “Fishing down then up the food web of an invaded lake,” by Erin S. Dunlop, Daisuke Goto, and Donald A. Jackson.

MEDIA CONTACT: Erin S. Dunlop, Ontario Ministry of Natural Resources, Peterborough, CANADA; e-mail:

[email protected]

This part of information is sourced from https://www.eurekalert.org/pub_releases/2019-09/potn-ftl091119.php

Erin S. Dunlop

[email protected]

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