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Evaluating the knowledge base for expanding low-trophic-level fisheries in Atlantic Canada

Sean C. Anderson,a Heike K. Lotze,a, Nancy L. Shackellb,

aBiology Department, Dalhousie University, 1355 Oxford Street, Halifax, NS B3H 4J1, Canada.

bBedford Institute of Oceanography, Ocean Sciences Division, P.O. Box 1006, Dartmouth, NS B2Y 4A2, Canada.

Corresponding author

Published on the web 13 November 2008.

Canadian Journal of Fisheries and Aquatic Sciences, 2008, 65:(12) 2553-2571, 10.1139/F08-156

Abstract

Over the last two decades, low-trophic-level fisheries have rapidly expanded in Atlantic Canada, largely compensating for collapsed groundfisheries; however, concerns have been raised regarding the limited background knowledge for many newly targeted species and their overexploitation in other regions. Using government stock assessments, we evaluated the amount of information available to assess population, fisheries, and ecosystem status in emerging (new since 1988), developing (expanding since 1988), and established fisheries on the Scotian Shelf. Emerging fisheries had significantly lower levels of population knowledge than developing and established fisheries. Importantly, knowledge was often lacking in basic population parameters such as growth rates, current biomass, and geographic range. In contrast, ecosystem knowledge, such as habitat disruption and recovery, was higher in emerging than established fisheries. Overall, quantitative knowledge was positively related to fishery value and greatest for 30- to 100-year-old fisheries. Although the number of government and general scientific publications greatly increased since 1990 for developing and established fisheries, publications for emerging fisheries remained at low levels. Emerging fisheries represent important socio-economic value in Atlantic Canada but may be progressing too rapidly for adequate knowledge to be gained, presenting a risk for their sustainable development.

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