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Engagement on the science-based whale review

Engagement on the science-based whale review: A summary of what was heard, March 2018

Engagement on the science-based whale review: A summary of what was heard, March 2018 (PDF, 1.28 MB)

A summary of what was heard
March 2018

Engagement on the Science-based Whale Review
A Summary of What was Heard

Prepared by the consortium of Nielsen, Delaney + Associates, PubliVate.
Contract #: FP918-17-0001

Ce document est également disponible en français.

Table of Contents

5. Prey Availability

Southern Resident Killer Whales are highly specialized predators and forage primarily on Chinook salmon. The survival and recovery of this endangered whale appears to be strongly linked to Chinook salmon abundance. In particular, a sharp decline in Chinook salmon abundance that persisted for four years during the late 1990s was associated with mortality rates up to 2-3 times greater than expected. Footnote 11 This lack of prey availability persists today and is one of the key threats to the recovery of the population.

Similarly, the decline of the St. Lawrence Estuary Beluga population in the late 1990s and changes in population dynamics coincided with changes in several environmental conditions, including a decline in the abundance of demersal fish and some pelagic prey Footnote 12, suggesting that food supply may have become limited and may still be playing a role in the current decline.

Changes in food supply that affect North Atlantic Right Whales include decreases in food availability (they feed on tiny zooplankton called copepods) and quality (i.e., nutritional value), and some shifts in distribution, including shifts that move their food supply to areas of high overlap with known threats. For example, in summer 2017, North Atlantic Right Whales were seen in record numbers in the Gulf of St. Lawrence, an area where they have not been known to congregate in large numbers.Footnote 13

5.1 Summary of Key Themes

Indigenous groups, governments, and other stakeholders provided feedback on the threat of prey availability for the Southern Resident Killer Whale. Indigenous groups provided feedback on prey availability for the St. Lawrence Estuary Beluga. Footnote 14

5.2 What Indigenous Groups Said

Southern Resident Killer Whale

Representatives from Indigenous groups expressed strong concerns about delaying concrete, substantive Southern Resident Killer Whale priority management actions and did not feel that the Science-Based Whale Review consultation process had balanced input from the full range of Indigenous groups and other stakeholders. They expressed that inaction can be expected to threaten the existence of the Southern Resident Killer Whale and to have a dramatic overall effect on the food chain and Aboriginal rights to fish.

Feedback from Indigenous participants included:

St. Lawrence Estuary Beluga

In responding to priority management actions identified in the Phase I scientific assessment, participants focused on the actions seeking to improve prey abundance through reduced competition and habitat enhancement.

Suggestions from Indigenous participants included:

5.3 What Governments and Other Stakeholders Said

St. Lawrence Estuary Beluga

The Ministère de l'Agriculture, des Pêches et de l'Alimentation du Québec commented that consideration should be given to managing the grey seal population and suggested this approach could reduce competition for St. Lawrence Estuary Beluga prey.

Southern Resident Killer Whale

Plan and manage fisheries to reduce human competition for Southern Resident Killer Whale prey

Some people supported implementing measures to reduce human competition for Southern Resident Killer Whale prey stocks in important foraging areas during key times, e.g., during years of poor Chinook returns. They believe that no further research is required before acting. A specific suggestion was to immediately reduce fishing pressure in already-identified foraging areas, including those areas with depleted Chinook stocks that transit Southern Resident Killer Whale critical habitat.

However, other participants felt that, before taking action, more work needs to be done to:

Form and formalize a TransboundaryFootnote 20 Working Group of science and management.

The feasibility of implementing many of the prey-related priority management actions is dependent on transboundary management with the United States and work within the framework of the Pacific Salmon Treaty. There was general support for moving forward transboundary work over the short-term.

Protect and preserve the freshwater habitat of important Southern Resident Killer Whale prey stocks.

Fisheries and Oceans Canada currently relies on existing legislation, e.g., the Fisheries Act, to protect local fish stocks and local habitat in the marine environment. With respect to freshwater habitat, the Fisheries Act requires that projects avoid causing serious harm to fish unless authorized by the Minister of Fisheries and Oceans Canada. This applies to work being conducted in or near waterbodies that support fish that are part of or that support a commercial, recreational, or Aboriginal fishery (e.g. Chinook Salmon). At the provincial levels, some actions are underway to protect Chinook habitat, such as new provincial groundwater regulations.

Addressing the threats to freshwater habitat was noted as more important than controlling harvest levels (the low hanging fruit) by some meeting participants and in some written submissions.

Suggestions included:

Implement fisheries management measures to foster healthy and abundant populations of herring and sand lanceFootnote 22 to support greater availability of Chinook.

Depletions of local populations of forage fish due to harvesting are a concern in the region. This depletion may be contributing to decreased Chinook biomass in the marine environment and, therefore, a reduction in the primary food source for Southern Resident Killer Whales.

Participants at the in person/webinar meetings and those who sent in written submissions supported:

Some participants expressed concerns about:

Participant suggestions included:

5.4 What the General Public Said

The main question on the Let's Talk Whales online platform presented a list of four actions identified by scientists to help mitigate the threat of reduced prey availability. Participants were asked to rank the actions according to how important they felt they were to helping the whales (see Figure 5, below).

Figure 5: The General Public’s Ranking of Identified Actions to Address the Threat of Reduced Prey (Food) Availability

Figure 5: The General Public’s Ranking of Identified Actions to Address the Threat of Reduced Prey (Food) Availability

Of the 265 who responded : Footnote 23

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