Community Research and Development Information Service - CORDIS

Efficacy of SLICE® treatment on sea trout (Ireland)

Field studies were undertaken over two years to examine sea trout population dynamics in two rivers in the west of Ireland entering bays with salmon aquaculture. SLICE®, the commercial in-feed treatment against sea lice, was used to treat wild sea trout to determine its efficacy in protecting smolts from sea lice infestation and determine its effects on their marine survival.

Sea trout smolts were held in tanks and divided into experimental (SLICE® treated) and control groups. The SLICE® group were administered small quantities of SLICE® treated food at regular intervals over a ten day period while the control group were fed untreated pellets. Although a large number of sea trout smolts were included in these experimental and control groups, few were recorded returning in upstream traps. Equal numbers of fish from both groups were recorded from the Gowla, whereas a greater number of SLICE®-treated fish returned to the Invermore in 2004.

In 2005 sufficient fish returned from control and experimental groups on the Gowla group to allow statistical analysis. There were no statistical differences between SLICE®-treated and control groups in terms of growth, weight, chalimus abundance, total lice level or days spent at sea.

Reported by

Central Fisheries Board
Mobhi Road, Glasnevin
Dublin 9 Dublin
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