Open AccessSaprolegniasis in wild fish populations
Author(s) -
María Luisa González de Canales,
Juan B. Ortiz,
Manuel A. González del Valle,
Carmen Sarasquete
Publication year - 2001
Publication title -
ciencias marinas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.215
H-Index - 29
eISSN - 2395-9053
pISSN - 0185-3880
DOI - 10.7773/cm.v27i1.373
Subject(s) - epidermis (zoology) , dermis , biology , fungus , immunosuppression , fish <actinopterygii> , pathology , zoology , anatomy , fishery , botany , medicine , immunology
The clinical signs and histopathological disturbances produced by Saprolegnia sp. are described in Chondrostomos polylepis and Rutilus albugineus, under environmental stress. The main alterations observed were loss of epithelium leading to ulceration and blood disorders, consisting of blood congestion and occasional hemorrhages. Infected fish developed focal lesions with the fungus invading the stratum spongiosum of the dermis before extending laterally over the epidermis. The onset of disease was brought about by a combination of a rapid fall in water temperature, which probably induced an effect of immunosuppression, and the maintenance of low water temperature, which favored the proliferation of the fungus.