Transport and dispersal of sea lice bath therapeutants from salmon farm net-pens and well-boats / F.H. Page ... [et al.].: Fs70-5/2015-064E-PDF

The purpose of this report is to explore some of the general factors that influence the exposure of non-target organisms to bath treatments (well-boat, skirt and tarp applications) and their relative importance in different salmon-production environments. This report focuses on some recent work done by a team lead by DFO to describe and predict the transport and dispersal of the pesticides released from tarp and well-boat bath treatments, specifically in the southwest New Brunswick region. Bath treatments are conducted in different environments in Canada but they all follow the same general processes: mixing inside, release from the source, subsequent transport and dispersal. The report is divided into two main sections. The first section focuses on tarp treatments of fish net-pens. The second section focuses on well-boat treatments. In each of these sections there are a series of sub-sections that describe the concepts and theories as well as observations associated with distinct stages in the therapeutant release sequence. It should be noted that the analyses associated with this work will continue for some time. Hence, the present document should be considered as a reflection of the state-of-knowledge at the time of this writing as well as an opportunity for stimulating discussion.

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