Study

Use of cleaner- wrasse (Centrolabrus exoletus (L.)) and Ctenolabrus rupestris (L.)) to control infestations of Caligus elongatus Nordmann on farmed Atlantic salmon

  • Published source details Tully O., Daly P., Lysaght S., Deady S. & Varian S.J.A. (1996) Use of cleaner- wrasse (Centrolabrus exoletus (L.)) and Ctenolabrus rupestris (L.)) to control infestations of Caligus elongatus Nordmann on farmed Atlantic salmon. Aquaculture, 142, 11-24.

Actions

This study is summarised as evidence for the following.

Action Category

Use natural control agents: cleaner wrasse

Action Link
Sustainable Aquaculture
  1. Use natural control agents: cleaner wrasse

    In 1992, a replicated, controlled study in Ireland (Tully et al., 1996) found rockcook cleaner wrasse failed to consistently reduce numbers of lice, Caligus elongates, in sea-caged salmon, Salmo salar. When compared to control cages, the wrasse controlled infestation levels, preventing an outbreak on only one of the seven sampling periods. Each of five circular salmon cages (50-70m circumference, 10m depth) was stocked with between 13,000 and 24,000 salmon smolts. Wrasse were added to four cages at wrasse: salmon ratios between 1:37 and 1:49. Wrasse were not added to the control cage.

     

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