New data on the introduction of the invasive signal crayfish Pacifastacus leniusculus (Dana, 1852) (Crustacea, Decapoda) and ectosymbiont branchiobdellidans (Annelida, Clitellata) in NW Iberian Peninsula

  1. Sergio Silva 1
  2. Pablo Outón 1
  3. David José Nachón 1
  4. Pablo Gómez-Sande 1
  5. Javier Sánchez-Hernández 1
  6. Rufino Vieira-Lanero 2
  7. Fernando Cobo 2
  1. 1 Universidade de Santiago de Compostela, Departamento de Zooloxía, Xenética e Antropoloxía Física
  2. 2 Universidade de Santiago de Compostela, Estación de Hidrobioloxía “Encoro do Con”
Journal:
NACC: Nova acta científica compostelana. Bioloxía

ISSN: 1130-9717

Year of publication: 2017

Issue: 24

Pages: 5

Type: Article

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More publications in: NACC: Nova acta científica compostelana. Bioloxía

Abstract

The non-native signal crayfish Pacifastacus leniusculus (Dana, 1852) has successfully been established in many catchments of Europe, causing detrimental impacts on both native flora and fauna. The aim of this paper was to report the anthropogenic introduction of P. leniusculus and its ectosymbionts (family Branchiobdellidae) in the River Tambre (NW Spain). Seventy one individuals of P. leniusculus were captured in the Barrié de la Maza reservoir in November 2016. The presence of several age classes, including young of the year individuals, and ovigerous females suggests that the population is already established and viable. Most individuals (96%) presented branchiobdellidans and 4% exhibited white spots probably caused by a virus. Melanised spots caused by the oomycete Aphanomyces astaci (Schikora, 1906) (crayfish plague) were not found in this sample. This population is expected to disperse through the River Tambre basin. The Tambre population may also be a source of individuals for new introductions in the region, where currently no P. leniusculus populations are known at a minimum radio of 150 km in straight line. Therefore, immediate management and preventive actions should be pursued to control the dispersion and growth of this population and to avoid new introductions (e.g. ban of crayfish fishing).

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