April 18, 2019 — Seafood fraud and mislabeled seafood is a permanent topic in the sustainable fisheries space and has been driving the demands for product traceability. Since 2011, Oceana has led the discourse on fish fraud by publishing sixteen reports on the subject.
Oceana Canada’s 2018 report exposed some important shortcomings in the Canadian seafood system and offered constructive, achievable mandates for reducing seafood fraud domestically, but the study collected data from a biased sample and only presented results that supported a narrative of rampant fraudulence.
Oceana collects seafood samples at restaurants and retail outlets, DNA tests them, then matches the DNA results to government labeling guidelines. The sampling focused specifically on cod, halibut, snapper, tuna, salmon and sole because these species historically, “have the highest rates of species substitution.” This nonrandom sampling is consistent with previous seafood fraud studies from Oceana.
Of the 382 seafood samples tested in Canada, 168 (44 percent) were found to be mislabeled.
None of the red snapper (Lutjanus campechanus), yellowtail or butterfish tested was appropriately labeled. Tuna was mislabeled 41 percent of the time, halibut 34 percent, cod 32 percent and salmon 18 percent.
Fundamental to the interpretation of the Oceana Canada 2018 study’s results is the understanding that the samples were selected to find fraud, not to measure the actual extent of fraud across the entire seafood supply chain. Oceana disclosed this in the report. However the press release it issued for this report, and subsequent headlines from other news sources, such as “At least one quarter of the seafood you buy is a lie” from the site IFL Science, created a different narrative.
Aside from the sampling criticisms, the analysis of specific species was especially flawed.