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The Atlantic cod may be five separate species rather than one


Atlantic cod are officially just one species, Gadus morhua

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Atlantic cod are actually five separate species of fish, not one, researchers have claimed after conducting a genetic analysis – though not everyone agrees with their findings.

“What we thought was a single species is actually more species,” says Einar Arnason at the University of Iceland. “It’s important in terms of biodiversity.”

Arnason and his colleagues have sequenced the genomes of nearly 1700 Atlantic cod, currently regarded as a single …

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