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The Occurrence of the Active Ingredients of Sea Lice Treatments in Sediments Adjacent to Marine Fish Farms

Results of Monitoring Surveys Carried Out By SEPA in 2001 and 2002

Document format: pdf

Publisher: Scottish Environment Protection Agency

Creation date: January 30, 2004

As part of an ongoing environmental monitoring programme to support the effective regulation of the discharge of chemo-therapeutants used for the treatment of sea lice infections on marine fish farms, concentrations of cypermethrin, teflubenzuron, ivermectin and emamectin benzoate were determined in sediments taken from areas of seabed around 44 marine fish farms during the 2001 sampling period and 30 marine fish farms during 2002.

The key objectives were:

To provide extensive survey data on the presence of sea lice treatment compounds in marine sediments, particularly those compounds not permitted by discharge consents issued under the Control of Pollution Act 1974 and so focus further investigative effort.

To check for measurable concentrations of those compounds that are permitted by discharge consents relating these where possible to relevant environmental standards.

This report represents the findings of the first 2 years of this screening programme. Samples were obtained during routine audit visits by SEPA's inshore survey vessels. Sampling sites were therefore chosen at random according to SEPA's audit monitoring programme already established for that period. Methods have been developed for the determination of cypermethrin, teflubenzuron, ivermectin and emamectin benzoate in sediments.

The results indicate the presence of these compounds in the sediments at low concentrations. Where permitted compounds were detected, measurable concentrations were restricted to areas of seabed below and close to marine fish farms. All results from out-with the Allowable Zone of Effects (AZE) were below SEPA's safe environmental standards and therefore, below the concentration at which any significant environmental damage is likely to occur.

Key Words: Scotland • UK • Salmon • Sea Lice • Parasite • Cypermethrin • Teflubenzuron • Ivermectin • Emamectin Benzoate • Ecotoxicology