According to a new study conducted by the ICM-CSIC, ocean warming will likely lead to smaller fish in the deep sea. This conclusion was reached through the analysis of fish otoliths found in geological formations dating back 700-800 thousand years. A study led by the University of Vienna, with pa
Mesopelagic fishes are an important element of marine food webs, a huge, still mostly untapped food resource, and great contributors to the biological carbon pump, whose future under climate change scenarios is unknown.
. For its preparation, the authors obtained fish otoliths, which are small stones in the inner ear of bony fish used for sound and balance perception, from 800-700 thousand-year-old sedimentary formations on the island of Rhodes in the Aegean Sea. They then analyzed the otoliths to monitor changes in fish body size throughout glacial and interglacial periods.
“Knowing the response of these organisms to ocean warming is key, since they contribute to ecosystem stability, reduce atmospheric carbon dioxide, and are a huge food resource for other organisms in the marine food web”, explains the ICM-CSIC researcher and co-author of the study Marta Coll, who adds that “these fish make up more than half the fish biomass in the deep sea, and about 100 times more than the total global annual fishery catches”.
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