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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Densities and biomass of larval sea lamprey populations (Petromyzon marinus Linnaeus, 1758) in north-western Spain and data comparisons with other European regions

Sergio Silva A B , Rufino Vieira-Lanero B , Sandra Barca A B and Fernando Cobo A B
+ Author Affiliations
- Author Affiliations

A Departamento de Zooloxía e Antropoloxía Física, Universidade de Santiago de Compostela, Facultade de Bioloxía, Campus Vida, Lope Gómez de Marzoa s/n, E-15782 Santiago de Compostela, Spain.

B Estación de Hidrobioloxía ‘Encoro do Con’, Universidade de Santiago de Compostela, Castroagudín s/n, E-36617 Vilagarcía de Arousa, Pontevedra, Spain.

C Corresponding author. Email: sergio.silva@usc.es

Marine and Freshwater Research 68(1) 116-122 https://doi.org/10.1071/MF15065
Submitted: 19 February 2015  Accepted: 10 September 2015   Published: 1 March 2016

Abstract

Although the sea lamprey, Petromyzon marinus Linnaeus, 1758, is a threatened species in Europe, available data on the condition and dynamics of its populations are very limited. Thus, electrofishing surveys were conducted annually between 2007 and 2011, so as to study the status and trends of larval populations of P. marinus in north-western Spain. In addition, data from other European regions were compiled. The density and biomass (mean ± standard error) of ammocoetes in selected areas of larval habitat in north-western Spain were 11.0 ± 1.44 individuals m–2 and 15.1 ± 2.64 g m–2, and showed signs of a population increase during the study period. However, conservation status of P. marinus was not considered favourable because of several factors, such as the widespread presence of obstacles (restriction of migration and habitat availability), along with some cases of organic pollution. Results and available data suggest that the largest populations of P. marinus as well as the main fisheries are located throughout the south-western areas of Europe (north-central Portugal, north–north-west of Spain and west–south-west of France). Signs of population increases were also registered in other European regions; however, more data are needed to confirm whether this trend has any relevance to a possible overall recovery.

Additional keywords: anadromous, fish management, freshwater, Habitats Directive, Iberian Peninsula, population dynamics.


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