Abstract
This study investigated the composition and structure of the parasitic communities in Oreochromis niloticus with respect to levels of water quality in three different ecosystems. A total of 366 O. niloticus were examined from three water courses: CLAR ponds, (unpolluted), Abbassa privet ponds (slightly polluted) and Manzalla ponds (polluted). Trematodes, monogeneans, cestodes and acanthocephalans were found in all the sample sites. Trematodes dominate the parasite population. Clinostomum tilapiae, Euclinostomum heterostomum, Diplostomum spathaceum, Posthodiplostomum minimum, Mesostephanus appendiculatus, Haplorchoides cahirinus, Cichlidogyrus aegypticus, Acanthosentis tilapiae and larval stages of Polyonchobothrium clariass were found in all the sampled sites, but the distribution of these parasitic species varied between the three ponds. Meanwhile, P. clarias, E. heterostomum; and A. tilapiae were completely absent in the severely polluted site. The observed composition and structural changes among the sites were studied; the variability of the calculated infection indices (prevalence, mean abundance and mean intensity); and the degree of interactivity among parasites, as well as parameters of species richness and diversity suggest that the structure of parasite communities are affected by the water contamination levels. Key word: Oreochromis niloticus, Polyonchobothrium clarias, Euclinostomum heterostomum, Acanthosentis tilapiae, multistressor environments.
Highlights
E ishing cause e effec ct of multistre essor en nviron nments s on Orreochrromis n niloticus and d its pa arasite e com mmunitties
S aegypticus, Acanthosenttis tilapiae an nd larval stag ges of Polyon nchobothrium m clariass were found in all the sampled sites, but the distrribution of th hese parasitic c species varried between the three nwhile, P. cla arias, E. heterrostomum; an nd A. tilapiae were comple etely absent in n the severely y polluted ponds
O. niloticus were sampled in three different ecosystems that differed according to their water quality
Summary
E ishing cause e effec ct of multistre essor en nviron nments s on Orreochrromis n niloticus and d its pa arasite e com mmunitties. This study investigated i the t composittion and structure of the p parasitic com mmunities in Oreochromis s niloticus with respectt to levels of water quality y in three diffe erent ecosys stems. The ob bserved comp position and structural ch hanges amon ng the sites w were studied d; the variability of the calculated in nfection indic ces (prevalen nce, mean abu undance and d mean intens sity); and the degree of interactivity among para asites, as welll as paramete ers of species s richness and d diversity su uggest that th he structure o of parasite communities are affected d by the water contaminatiion levels. The t y stresssor may ameliorate the efffects of parassitism
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