Populations of sardinella, an important protein-rich fish, are in rapid decline in the waters off Guinea-Bissau in West Africa. The decline appears to be related to industrial fishing for two species of sardinella used to make fishmeal, according to a report by investigative news organization OCCRP. In Guinea-Bissau, fish like the Madeiran sardinella (Sardinella maderensis) and round sardinella (Sardinella aurita) are among the primary ingredients in fishmeal, a processed fish product added to livestock feed for added protein and nutrients. But sardinella is also a crucial food for people in Guinea-Bissau and other West African nations. A fisheries assessment for the Guinea-Bissau government showed sardinella stocks have been decimated, according to the OCCRP report. This decline coincided with the arrival two Chinese fishmeal factories and a fleet of Turkish fishing boats off the coast of Guinea-Bissau. In an email to Mongabay, OCCRP report co-author Josef Skrdlik said the migration patterns of sardinella still aren’t fully understood, so there could be other explanations for the decline. “That said, the assessment, combined with the export data we’ve compiled, points to the Chinese-owned factory ships as the main culprits,” Skrdlik said. “The export data indicates that the production on the ships — supplied by a Turkish fleet for which sardinella was a key target — took place at a scale consistent with the decline in the sardinella stocks observed between 2013 and 2025,” he added. “In particular, fishmeal exports by a company linked to the floating factories corresponded to at least 350,000 tons…This article was originally published on Mongabay