Discussion Paper on FRIM in South Coast Recreational Fisheries

The MCC has produced a discussion paper titled: Incorporating Fisheries Related Incidental Mortality (FRIM) of Fraser River Spring/Summer 42/52 Chinook in the Estimation of Total Mortalities in Marine Recreational Fisheries (DFO Management Areas 18,19,20,29,121,123).

The intent of this discussion paper is to stimulate conversation and engage with technical experts around the application of guidance provided in Patterson et al. 2017 (Guidance to Derive and Update Fishing-Related Incidental Mortality Rates for Pacific Salmon) in the marine recreational fishery. The goal of this is to provide more robust FRIM and total mortality estimates to inform fisheries management in the context of both salmon recovery and conservation and Southern Resident Killer Whale recovery.

The discussion paper follows the guidance in Patterson et al. 2017 to examine if the potential Fisheries Related Incidental Mortality is currently being underestimated by DFO and the Pacific Salmon Commission. It is focused on Fraser River Spring and Summer 42/52 chinook that are subject to a recreational fishery in the Juan de Fuca, Port Renfrew, Victoria and marine Fraser River areas.

The paper provides strong evidence that the guidance in Patterson et al. 2017, when applied to this fishery, will increase the FRIM and total mortality estimates. This has many important implications.

Fraser Chinook FRIM Discussion Paper_6 March 2019

Patterson, D.A., Robinson, K.A., Raby, G.D., Bass, A.L., Houtman, R., Hinch, S.G., and Cooke, S.J. 2017. Guidance to Derive and Update Fishing-Related Incidental Mortality Rates for Pacific Salmon. DFO Can. Sci. Advis. Sec. Res. Doc. 2017/011. vii + 56 p.

Available online at: https://waves-vagues.dfo-mpo.gc.ca/Library/40602758.pdf

New study suggests migratory Chinook salmon may be at risk from salmon farms

A recently released paper in the journal Facets on Piscine orthoreovirus (PRV) in farmed Atlantic and Chinook salmon. The paper suggests that migratory Chinook salmon may be at more than a minimal risk of disease from exposure to high levels of PRV occurring in salmon farms.

Title: The same strain of Piscine orthoreovirus (PRV-1) is involved in the development of different, but related, diseases in Atlantic and Pacific Salmon in British Columbia

Authors:  Emiliano Di Cicco, Hugh W. Ferguson, Karia H. Kaukinen, Angela D. Schulze, Shaorong Li, Amy Tabata, Oliver P. Gunther, Gideon Mordecai, Curtis A. Suttle, Kristina M. Miller

Abstract

Piscine orthoreovirus Strain PRV-1 is the causative agent of heart and skeletal muscle inflammation (HSMI) in Atlantic salmon (Salmo salar Linnaeus, 1758). Given its high prevalence in net pen salmon, debate has arisen on whether PRV poses a risk to migratory salmon, especially in British Columbia (BC) where commercially important wild Pacific salmon are in decline. Various strains of PRV have been associated with diseases in Pacific salmon, including erythrocytic inclusion body syndrome (EIBS), HSMI-like disease, and jaundice/anemia in Japan, Norway, Chile and Canada. We examined the developmental pathway of HSMI and jaundice/anemia associated with PRV-1 in farmed Atlantic and chinook (Oncorhynchus tshawytscha (Walbaum, 1792)) salmon in BC, respectively. In situ hybridization localized PRV-1 within developing lesions in both diseases. The two diseases showed dissimilar pathological pathways, with inflammatory lesions in heart and skeletal muscle in Atlantic salmon and degenerative-necrotic lesions in kidney and liver in chinook salmon, plausibly explained by differences in PRV load tolerance in red blood cells. Viral genome sequencing revealed no consistent differences in PRV-1 variants intimately involved in the development of both diseases suggesting that migratory chinook salmon may be at more than a minimal risk of disease from exposure to the high levels of PRV occurring in salmon farms.

Full article (PDF)

CTV News Story from May 7, 2018