“It's good fishing in troubled waters.”
Letter 50, to Henry, Bishop of Bayeux, 1170, in J. A. Giles (ed.) Petri blesensis bathoniensis archidiaconi opera omnia (Oxonii: J. H. Parker, 1846-7) vol. 1, p. 155; translation from Provérbios Latinos. http://www.hkocher.info/minha_pagina/adagia/adagia_a.htm
Original
Aqua turbida piscosior est.
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Peter of Blois 3
French poet and diplomatRelated quotes

“Best fishing in troubled waters.”
Orlando Furioso (completed in 1591).
“They may the better fish in the water when it is troubled.”
Chronicles (I, 283).

“I want to get out in the water. I wanted to see fish, real fish, not fish in a laboratory.”
Interview: Sylvia Earle Undersea Explorer http://www.achievement.org/autodoc/printmember/ear0int-1, Academy of Achievement, January 27, 1991

Source: The Golden Bough (1890), Chapter 3, Sympathetic Magic.
Context: The natives of British Columbia live largely upon the fish which abound in their seas and rivers. If the fish do not come in due season, and the Indians are hungry, A Nootka wizard will make an image of a swimming fish and put it into the water in the direction from which the fish generally appear. This ceremony, accompanied by a prayer to the fish to come, will cause them to arrive at once.