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Louis A. Helfrich

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Publication

Featured researches published by Louis A. Helfrich.

Archive | 2009

Understanding Fish Nutrition, Feeds, and Feeding

Steven Craig; Louis A. Helfrich

Archive | 2009

Pesticides and Aquatic Animals: A Guide to Reducing Impacts on Aquatic Systems

Louis A. Helfrich; Diana L. Weigmann; Patricia A. Hipkins; Elizabeth R. Stinson

Archive | 2000

Fish Kills: Their Causes and Prevention

Louis A. Helfrich; Stephen Allen Smith

Archive | 2005

Sustaining America's Aquatic Biodiversity. Freshwater Mussel Biodiversity and Conservation

Louis A. Helfrich; Richard J. Neves; Hilary Chapman

Archive | 2009

Commercial Frog Farming

Louis A. Helfrich; Richard J. Neves; James A. Parkhurst

Archive | 2005

Sustaining America's Aquatic Biodiversity. Crayfish Biodiversity and Conservation

Louis A. Helfrich; Robert J. DiStefano

Archive | 2000

Control Methods For Aquatic Plants in Ponds and Lakes

Louis A. Helfrich; Richard J. Neves; George S. Libey; Tammy J. Newcomb

Archive | 2009

The Control of Burrowing Crayfish in Ponds

Louis A. Helfrich; James A. Parkhurst; Richard J. Neves

Archive | 2001

Liming Acidified Lakes and Ponds

Louis A. Helfrich; Richard J. Neves; James A. Parkhurst

Archive | 1993

Guidelines for Liming Acidified Streams and Rivers

Diana L. Weigmann; Louis A. Helfrich; Daniel Murphy Downey

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Diana L. Weigmann

Virginia Tech

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Tammy J. Newcomb

Virginia Tech

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Patricia A. Hipkins

Virginia Tech

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