| Publication Type: | Book Chapter |
| Year of Publication: | 2003 |
| Authors: | S. Consuegra, C. de Le niz, G. ¡a, Serdio, A. |
| Editor: | M. Lamuela, Alvarez J. |
| Book Title: | Un Viaje de Ida y Vuelta. IV Jornadas del Salm¢n Atl ntico en la Pen¡nsula Ib‚rica |
| Series Title: | IV Jornadas del Salm¢n Atl ntico en la Pen¡nsula Ib‚rica |
| Pagination: | 123-134 |
| Publisher: | Gobierno de Navarra, Dpto. de Medio Ambiente, Ordenaci¢n del Territorio y Vivienda. Gesti¢n Ambiental - Viveros y Repoblaciones de Navarra. |
| City: | Pamplona |
| Keywords: | ADULT, ADULTS, ANISAKIS, ATLANTIC SALMON, BACTERIA, BREEDING, CANTABRIA, CAPTIVE BREEDING, DISEASE, DISEASES, ENDANGERED, FISH, FISH DISEASE, FUNGUS, GENETIC, GENETIC VARIATION, GLUCOSE, HAEMOGLOBIN, HEALTH CONDITION, HEMATOCRIT, IMMUNE SYSTEM, INFECTIOUS, INFECTIOUS DISEASE, INFECTIOUS DISEASES, LEUKOCRIT, MARINE, METHOD, METHODS, MHC, MOLECULAR, MORTALITY, PARASITE, PATHOGEN, PATHOGENS, POPULATION, POPULATIONS, PROTEIN, RESISTANCE, RESTORATION, RIVER, RIVERS, SALMON, SPAIN, YERSINIA RUCKERI |
| Abstract: | We have examined the health status of adult Atlantic salmon returning to the rivers As¢n, Pas-Pisue¤a, Nansa and Deva (Cantabria) during the period 1996-2002. Extreme values of hematocrit, leukocrit, haemoglobin, plasma protein and glucose were detected in some individuals, reflecting their poor health and, in some cases, their depressed immune system. The main pathogens detected in the wild populations include the bacteria Aeromonas salmonicida, Aeromonas hydrophilla, Yersinia ruckeri and Photobacterium damsela e, as well as the opportunistic fungus Saprolegnia sp. and the internal marine parasite Anisaki s. In general, the most depressed salmon populations were those located in the most altered watersheds; these showed in turn the poorest health condition, the highest incidence of infectious diseases, and the greatest extent of pre-spawning mortalities. We begun recently to apply molecular methods for the detection of infectious diseases, based on PCR-amplifica-tion of target pathogenic genomes. The advantages of molecular methods over traditional diagnostic techniques include greater sensitivity and faster results, as well as the possibility to carry out the analysis non-destructively, before there are any clinical symptoms of the disease. Another molecular approach we have recently undertaken is the analysis of genetic variation at the MHC. This may allow us to improve the resistance of salmon to infectious diseases in the future, which should prove useful in captive breeding programmes and in the restoration of wild populations. |
| Reprint Edition: | IN FILE |