Downstream migration and hematophagous feeding of newly metamorphosed sea lampreys (Petromyzon marinus Linnaeus, 1758)
- 494 Downloads
The metamorphosis of sea lamprey (Petromyzon marinus Linnaeus, 1758) allows young postmetamorphic individuals to migrate to the sea and start the hematophagous feeding. However, the information about this phase is very limited, especially for European populations. Herein, we provide for the first time a comprehensive study on the phenology of downstream migration, the timing and location of first feeding and the prey species in the River Ulla and its estuary (NW Spain). Results show that downstream migration occurs between October and May with a peak in March. At least for a part of the postmetamorphic lampreys this migration stops for several months when they reach the estuary, where lampreys find shelter and abundant food, before moving to coastal waters. Hematophagous feeding in the estuary allows postmetamorphics to increase their total length and weight exponentially. Our results also suggest that part of the postmetamorphics (10–30%) start the hematophagous feeding in the river, with a special affinity for anadromous species, probably because of their larger size.
KeywordsEstuary Migration Petromyzon Salmo Alosa Liza
Part of this study has been carried out in the laboratories of the Station of Hydrobiology of the USC ‘Encoro do Con’ in Vilagarcía de Arousa. The authors thank the staff of this station due their participation in the surveys, especially D. J. Nachón. We also thank the staff of Ximonde permanent trap for their collaboration in this study. This study has been partially supported by the project 10PXIB2111059PR of Xunta de Galicia and the project MIGRANET of the Interreg IV B SUDOE (South-West Europe) Territorial Cooperation Programme (SOE2/P2/E288).
- Berra, T. M., 2001. Freshwater Fish Distribution. Academic Press, London.Google Scholar
- Caballero, P., F. Cobo & M. A. González, 2006. Life history of a sea trout (Salmo trutta L.) population from the north-west Iberian Peninsula (River Ulla, Galicia, Spain). In Harris, G. & N. Milner (eds), Sea Trout: Biology, Conservation & Management. Blackwell, Oxford: 234–247.Google Scholar
- Freyhof, J. & M. Kottelat, 2008. Petromyzon marinus. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. www.iucnredlist.org. Downloaded on 18 June 2012.
- Grajal-Blanco, M., 1980. Las corrientes marinas y su influencia en la zona del Vado en la Isla de Arosa. Cuadernos do Laboratorio Xeolóxico de Laxe 1: 249–278.Google Scholar
- Hardisty, M. W., 2006. Lampreys: Life Without Jaws. Forrest Text, Ceredigion.Google Scholar
- Hardisty, M. W. & I. C. Potter, 1971. The general biology of adult lampreys. In Hardisty, M. W. & I. C. Potter (eds), The Biology of Lampreys, Vol. 1. Academic Press, London: 127–206.Google Scholar
- Kelly, F. L. & J. J. King, 2001. A review of the ecology and distribution of three lamprey species, Lampetra fluviatilis (L.), Lampetra planeri (Bloch) and Petromyzon marinus (L.): a context for conservation and biodiversity considerations in Ireland. Biology and Environment: Proceedings of the Royal Irish Academy 101B: 165–185.Google Scholar
- Taverny, C. & P. Elie, 2009. Bilan des connaissances biologiques et de l’état des habitats des lamproies migratrices dans le bassin de la Gironde—Propositions d’actions prioritaires. Rapport Final. Etude Cemagref, Groupement de Bordeaux.Google Scholar
- Taverny, C., M. Urdaci, A. M. Elie, L. Beaulaton, I. Ortusi, F. Daverat & P. Elie, 2005. Biologie, écologie et pêche des lamproies migratrices (Agnathes amphihalins)—Troisième tranche fonctionnelle. Rapport Final. Etude Cemagref, Groupement de Bordeaux.Google Scholar