nfection patterns ofMyxobolus heterosporain two tilapia species (Teleostei: Cichlidae) and its potential effects

Abstract

A Myxobolus heterospora (Baker, 1963) infection was found in 2 euryhaline tilapia species, Sarotherodon melanotheron melanotheron (Rüppel, 1853) and Tilapia zillii (Gervais, 1852), from a brackish water lake, Lake Nokoué (Benin, West Africa). The histology and ultrastructure of different levels of infection in intestinal connective tissues and wall tissues is described. A total of 391 S. melanotheron melanotheron and 222 T. zillii were examined from October 1987 to October 1989. M. heterospora was found throughout the study period, with a total prevalence of 42.19 and 26.57% for S. melanotheron melanotheron and T. zillii respectively. There was a statistically significant difference in occurrence as a function of season in S. melanotheron melanotheron but not in T. zillii, and there was a significant difference for size and sex in the former and for sex in the latter. M. heterospora induces total destruction of the intestine structure and probably leads to osmoregulatory disturbance. Further investigations of this myxosporean infection are necessary to determine its real effect on the host, since host survival and osmoregulatory rate have not yet been assessed.

Phylogeny, ultrastructure, histopathology and prevalence of Myxobolus oliveirai sp. nov., a parasite of Brycon hilarii (Characidae) in the Pantanal wetland, Brazil

“…nov. This finding is in agreement with accounts describing some Myxozoa species (Gbankoto et al 2001, Viozzi & Flores 2003, but contrasts with others (Muzzall 1995, Gbankoto et al 2003 that reported a significant difference between females and males regarding the prevalence of infection.…”

“…This finding is in contrast to results described by Gbankoto et al (2001), who report the occurrence of significant seasonal variations in Myxobolus sp. and Myxobolus zillii parasites of Sarotherodon melanotheron melanotheron and Tilapia zillii, respectively, and Gbankoto et al (2003), who report seasonal differences in the infection of S. melanotheron melanotheron by Myxobolus heterospora. However, the results of the present study are in agreement with those described by Gbankoto et al (2003), who report no seasonal variation in the infection of T. zillii by M. heterospora.…”

Epidemiology of Cryptosporidium molnari in Spanish Gilthead Sea Bream ( Sparus aurata L.) and European Sea Bass ( Dicentrarchus labrax L.) Cultures: from Hatchery to Market Size

“…The infection pattern with a peak at a particular age and size host and a subsequent decrease in older animals, a convex profile, has also been described for fish myxosporeans (2,21,34,43) and some fish protozoans (37). Biological, ecological, and immunological aspects may affect the host age distribution and dispersion patterns.…”

Morphology and host–parasite interaction of Henneguya azevedoi n. sp., parasite of gills of Leporinus obtusidens from Mogi-Guaçu River, Brazil

“…A number of authors have described similar findings (Gbankoto et al 2001;Viozzi and Flores 2003;Milanin et al 2010). However, other authors have reported significant difference between females and males regarding the prevalence of infection (Muzzall 1995;Gbankoto et al 2003).…”