Microhabitat use, not temperature, regulates intensity of Gyrodactylus cichlidarum long-term infection on farmed tilapia-Are parasites evading competition or immunity?
Por:
Rubio-Godoy M., Munoz-Cordova, G, Garduno-Lugo, M, Salazar-Ulloa M., Mercado-Vidal G.
Publicada:
10 feb 2012
Resumen:
Gyrodactylids (Monogenea) are ectoparasites of fish, some of which negatively affect commercially valuable fishes. Temperature strongly regulates population dynamics of these viviparous flatworms in farmed and wild fish populations, with most gyrodactylid species showing positive temperature-abundance associations. In agreement with epidemiological theory, numerous laboratory studies demonstrate that these parasites cannot persist in confined fish populations without periodic introduction of susceptible hosts. Extinction of gyrodactylid populations is due to host immunity, which develops in several fish species. In this one-year study, we followed populations of the recognized pathogen Gyrodactylus cichlidarum infecting four genetic groups of confined tilapia (wild type Nile tilapia Oreochromis niloticus niloticus, red O. n. nitoticus, Mozambique tilapia O. mossambicus and a red synthetic population called Pargo-UNAM) kept under farming conditions and subject to natural environmental f
Filiaciones:
Univ Nacl Autonoma Mexico, CEIEGT, Fac Med Vet & Zootecnia, Martinez De La Torre 93600, Veracruz, Mexico
Instituto de Ecología A.C., Km 2.5 ant. carretera a Coatepec, Xalapa, Veracruz 91070, Mexico
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