Balancing prey availability and predator consumption: A multispecies stock assessment for Lake Ontario
Canadian Journal Fisheries and Aquatic Sciences
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Abstract
Trophic interactions are drivers of ecosystem change and stability, yet are often excluded from fishery assessment models, despite their potential capacity to improve estimates of species dynamics and future fishery sustainability. In Lake Ontario, recreational salmonine fisheries, including Chinook salmon (Oncorhynchus tshawytscha) and lake trout (Salvelinus namaycush), depend on a single prey species, alewife (Alosa pseudoharengus). To accommodate strong trophic interactions among species, we developed a multispecies statistical catch-at-age assessment (MSCAA) model that links the dynamics of the salmonine fisheries and alewife via prey consumption and predator growth. We found that prey availability had declined since 2015 due to decreased alewife recruitment and increased Chinook salmon biomass, leading to higher alewife mortality rates and lower predator growth rates. Forward projections of predator–prey dynamics suggest that Chinook salmon stocking reductions may improve the probability for alewife population growth, but could be counteracted by increased natural Chinook salmon recruitment. Combined with predator- and prey-monitoring efforts, multispecies assessments show promise as models of intermediate complexity to support a transition to ecosystem-based approaches to fisheries management.
Suggested Citation
Fitzpatrick, K.B., Weidel, B., Connerton, M., Lantry, J.R., Holden, J.P., Yuille, M.J., Lantry, B.F., LaPan, S.R., Rudstam, L.G., Sullivan, P., Brenden, T., Sethi, S., 2022, Balancing prey availability and predator consumption: A multispecies stock assessment for Lake Ontario: Canadian Journal Fisheries and Aquatic Sciences, v. 79, 9, 17 p., https://doi.org/10.1139/cjfas-2021-0126.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Balancing prey availability and predator consumption: A multispecies stock assessment for Lake Ontario |
| Series title | Canadian Journal Fisheries and Aquatic Sciences |
| DOI | 10.1139/cjfas-2021-0126 |
| Volume | 79 |
| Year Published | 2022 |
| Language | English |
| Publisher | Canadian Science Publishing |
| Contributing office(s) | Coop Res Unit Leetown, Great Lakes Science Center |
| Description | 9, 17 p. |
| Country | Canada, United States |
| Other Geospatial | Lake Ontario |