Overstocking and poor habitat lead to fish kills: Hewlett et al., 2009

May 21, 2009

Journal:Fisheries Management and Ecology
Location: England and Wales, UK

In 2004 and 2005, 187 fish kills were investigated in lake fisheries in England and Wales, predominantly stocked with Common Carp. The fish kills largely occurred in Spring (April – June) in lakes with high stocking densities (>1500 kg ha−1), a uniform habitat, and few aquatic shore plants (macrophytes). Mortality was mainly from parasitic infections (White Spot, Chilodonella species, Ichthyobodo necator, and Fish Lice) and ulcerative diseases caused by infection with the bacterium Aeromonas salmonicida, and secondary bacterial infections of other Aeromonas and Pseudomonas bacteria. Recent stocking was linked to Carp fish kills.

Common Carp – Cyprinus carpio
White Spot – Ichthyophthirius multifiliis
Fish Louse – Argulus sp.

Hewlett NR, Snow J, Britton JR, 2009. “The role of management practices in fish kills in recreational lake fisheries in England and Wales” Fisheries Management and Ecology, 16(3): 248 – 254, DOI: 10.1111/j.1365-2400.2009.00671.x

Affiliations: Environment Agency, UK
Bournemouth University, UK

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