Variations in the population dynamics of the European eel Anguilla anguilla (L.) along the course of a Cantabrian river

  • Lobón‐Cerviá J
  • Utrilla C
  • Rincón P
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Abstract

The size, density and production rate of eel were determined at 16 contrasting sites along the Esva River over the years 1990-1993. Eels in the Esva were small, short-lived and mostly males (>99%) and increased with distance from the river mouth. For all sites, the number of eels increased in spring and summer and peaked by late autumn, coincident with higher water temperature and lower discharge. Average production for the first year was 158.6 kg.ha-1.yr-1 (range 56.5-378.0) but decreased to 104.2 and 89.7 in the next two years. The reduction in the numbers of eels rather than the later reduction in mean size was responsible for this decrease. -from Authors

Author-supplied keywords

  • Anguilla anguilla
  • density
  • longitudinal segregation: river course
  • production
  • size

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Authors

  • J. Lobón‐Cerviá

  • C. G. Utrilla

  • P. A. Rincón

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