Taxonomy of Pollocks: One Species or Two?
Author Information
Author(s): Anita Ursvik, Ragna Breines, Jørgen Schou Christiansen, Svein-Erik Fevolden, Dag H. Coucheron, Steinar D. Johansen
Primary Institution: University of Tromsø
Hypothesis
Are walleye pollock and Norwegian pollock distinct species?
Conclusion
Walleye pollock and Norwegian pollock are inferred to be one single species, with the Norwegian pollock recently introduced to the Atlantic from the Pacific.
Supporting Evidence
- 204 variable positions were identified among the 12 pollock specimens.
- Phylogenetic analysis clearly identifies the Norwegian pollock within the walleye pollock species cluster.
- The Norwegian pollock sequences were most similar to mitochondrial genotypes present in walleye pollock from the Sea of Japan.
Takeaway
Scientists studied two types of pollock fish and found out they are actually the same species, even though they were thought to be different.
Methodology
The complete mitochondrial genome sequences of multiple individuals of Norwegian pollock, walleye pollock, Atlantic cod, and haddock were analyzed.
Limitations
The study relies on genetic data, which may not fully represent morphological distinctions.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website