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      Saprolegnia parasitica en salmones y truchas del sur de Chile Translated title: Saprolegnia parasitica in salmon and trout from southern Chile


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          Se estudiaron 35 cepas de Saprolegnia, aisladas de Salmón y Trucha, provenientes de dos laboratorios ictiopatológicos de Castro y Puerto Montt, de Chile. Las cepas fueron obtenidas de ovas, branquias y aletas de alevines y "smolt", de distintas especies de salmonídeos: salmón del Atlántico, salmón coho y trucha arco iris. Se reaislaron las cepas y se purificaron en agar Sabouraud, agar Lactrimel y agar MAO, con antimicrobianos. Saprolegnia fue cultivada en agua destilada y semillas de cáñamo, para la producción de estructuras sexuales y posterior identificación morfológica, según <A HREF="#a11">Dick (1973</A>) y <A HREF="#a27">Seymour (1970)</A>. De las cepas estudiadas, las 35 correspondieron a Saprolegnia parasitica, única especie aislada, conformando el 100 % del total. El 34% de las cepas presentó estructuras sexuadas y el 100% se desarrolló a 30ºC.

          Translated abstract

          Thirty five strains of Saprolegnia were isolated from salmon and trout, obtained from the IX, X and XII regions in southern Chile. The strains were obtained from eggs, gills and fins of alevins and smolt phase of different species of salmonids: Salmo salar (Atlantic salmon); Oncorhynchus kisutch (Coho salmon) and Oncorhynchus mykiss (rainbow trout). The strains were re-isolated and purified in Sabouraud agar, Lactrimel and MAO agar, supplemented with antibiotics. The strains were cultured in distilled water and hemp seeds, for the production of sexual structures, and for their morphological identification. All strains collected, were identified as Saprolegnia parasitica. This species was the only one isolated of its genus.

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          Aquaculture disease and health management.

          Disease problems constitute the largest single cause of economic losses in aquaculture. In 1988, channel catfish producers lost over 100 million fish worth nearly $11 million. Estimates for 1989 predict even higher losses. The trout industry reported 1988 losses of over 20 million fish worth over $2.5 million. No data are available on losses sustained by producers of shellfish. Bacterial infections constitute the most important source of disease problems in all the various types of production. Gram-negative bacteria cause epizootics in nearly all cultured species. Fungal diseases constitute the second most important source of losses, especially in the culture of crustaceans and salmon. External protozoan parasites are responsible for the loss of large numbers of fry and fingerling fin fishes and are a cause of epizootics among young shellfish. The number of therapeutants approved by the Food and Drug Administration is limited. Research to support the registration of promising therapeutic agents is urgently needed.
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            The Genus Saprolegnia

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              Efficacy of bronopol against infection of rainbow trout (Oncorhynchus mykiss) with the fungus Saprolegnia species.

              A trial was carried out to test the efficacy of bronopol against infection of rainbow trout broodstock with the fungus Saprolegnia species. Replicate groups of 20 fish were held in each of four raceways. Two groups were treated in baths containing 20 mg bronopol/litre for 30 minutes on 15 consecutive days, and the other groups were treated in a similar way with a placebo. In the treated groups the percentages of infected fish decreased during the trial from 70 per cent and 40 per cent to 0 per cent, whereas the percentages in the placebo groups increased from 45 to 74 per cent and from 35 to 55 per cent; the severity of the infection also increased in the placebo groups.

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                Archivos de medicina veterinaria
                Arch. med. vet.
                Facultad de Ciencias Veterinarias, Universidad Austral de Chile (Valdivia )
                January 2004
                : 36
                : 1
                : 71-78
                [1 ] Universidad Austral de Chile
                [2 ] ADL Diagnostic Chile Ltd
                [3 ] Aquatic Healht Chile Ltd
                [4 ] Marine Harvest Chile S.A.



                SciELO Chile

                Self URI (journal page): http://www.scielo.cl/scielo.php?script=sci_serial&pid=0301-732X&lng=en

                General veterinary medicine
                salmon,Saprolegnia parasitica,fish mycosis,saprolegniasis,salmón,micosis de peces,saprolegniosis


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