[PDF] Downstream migration and hematophagous feeding of newly metamorphosed sea lampreys (Petromyzon marinus Linnaeus, 1758) | Semantic Scholar
@article{Silva2012DownstreamMA, title={Downstream migration and hematophagous feeding of newly metamorphosed sea lampreys (Petromyzon marinus Linnaeus, 1758)}, author={Sergio Silva and Mar{\'i}a J. Servia and Rufino Vieira-Lanero and Fernando Cobo}, journal={Hydrobiologia}, year={2012}, volume={700}, pages={277-286}, url={https://api.semanticscholar.org/CorpusID:16752713} }
Results show that downstream migration occurs between October and May with a peak in March, and suggest that part of the postmetamorphic lampreys start the hematophagous feeding in the river, with a special affinity for anadromous species, probably because of their larger size.