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4.0 Aquatic Effects Assessment

Fisheries and Oceans Canada (DFO) developed the Pathways of Effect (PoE) as a framework for assessing the potential impacts of a project on fish and fish habitat. In the Guide to the Risk Management Framework for DFO Habitat Management Staff Practitioners Version 1.0 (Fisheries and Oceans Canada 2006), hereafter referred to as the RMF Guide, PoE are used to describe projects in terms of the activities that are involved (e.g., vegetation clearing, flow management) and the mechanisms by which stressors ultimately lead to effects on the aquatic environment. The aquatic effects assessment described in the following sections was guided by this PoE framework.

The PoE are pathways that are also linked to mitigation, in that the effect pathway can be ‘broken’ by applying mitigation measures to avoid or minimize the effect. This PoE approach is useful to determine possible cause-and-effect relationships between in-water or near water activities and the aquatic environment. At the beginning stages of project design, all activities that have the potential to affect fish habitat in a negative way are identified.

4.1 Proposed Works and Potential Impacts

Standard activities associated with construction projects of this type and scale can often be linked to fish and fish habitat impacts. These more general activities and associated impacts include the following: