Community of Monogenea in populations of Cichla monoculus from two tributaries of the Amazon River in the Northern Brazil

Abstract

SummaryThis study compared the monogeneans community in C. monoculus from the Tapajós River (state of Pará) and Jari River (state of Amapá), northern Brazil. A total of 2188 monogeneans belonging to eight taxa were collected from the gills of fish: Gussevia arilla, Gussevia longihaptor, Gussevia tucunarense, Gussevia undulata, Sciadicleithrum ergensi, Sciadicleithrum umbilicum, Sciadicleithrum uncinatum and Tucunarella cichlae. Gussevia arilla was the dominant species for C. monoculus from the Tapajós River basin, while S. umbilicum predominated among the hosts from the Jari River basin. For the two populations of C. monoculus, the prevalence, mean intensity and mean abundance of monogeneans were different and the of parasites community had a high qualitative similarity (87.5 %). The monogeneans community of C. monoculus was characterized by high species richness, with infection values varying from low to moderate. The geographic distance and differences in environmental characteristics arising from the same did not influence the richness of species of monogeneans infesting C. monoculus in the Tapajós and Jari rivers, but appear to have been determinants in the differences observed in the structure of the monogenean communities in each region.

Physicochemical Water Quality Influence on the Parasite Biodiversity in Juvenile Tilapia (Oreochromis spp.) Farmed at Valle Del Mezquital in the Central-Eastern Socioeconomic Region of Mexico

“…Finally, the positive correlation between populations of monogeneans has been previously reported between Gussevia tucunarense and Gussevia arilla in cichlid fish ( Cichla monoculus ), with a Spearman’s correlation coefficient of up to 0.69. These data suggest that there is no competition between these species [ 40 ]. It has been reported that in the presence of elevated nitrogenous compounds in the water, the cells rich in mitochondria and chlorides increase in count, in addition to the fact that the gills present lamellar fusion; this leads to a decrease in the number of functional Cl − /HCO3 − and to a state of alkalosis in fish, facilitating the colonization and proliferation of parasites such as monogeneans, which usually attack the anatomical branchial region.…”

Аналіз Видового Різноманіття Паразитів Окремих Видів Риб Прісноводних Водойм України. Моногенетичні Сисуни

“…вільно плаваючі личинки вкриті війчастим епітелієм, мають розвинені очі інвертованого типу, на задньому кінці тіла є зачаток апарату кріплення з гачками, який має назву церкомер [27][28][29][30]. У світовій літературі нараховується достатня кількість публікацій, що присвячені проблемам хвороб риби, спричинених одноклітинними організмами, цестодами, трематодами, нематодами, п'явками та крустацеозами [11-23], водночас бракує даних щодо поширення хвороб, викликаних моногенетичними присисними організмами.…”