Abstract
Fish parasites can be good indicators of the quality of water bodies, and their presence or absence can be interpreted as a sign of habitat changes, helping us to diagnose environmental problems. This study was conducted in two estuaries located in the Paraiba state, northeastern Brazil: Mamanguape, an environmental protection area, and Paraiba do Norte, a river with riverside communities along its length. The objective of the study was to determine whether host and abiotic characteristics predict the richness of fish gill parasites and/or the abundance of the most abundant and prevalent parasite species, the copepod Acusicola brasiliensis, testing the species as a possible bioindicator. The fish host species were Anchoa januaria, Atherinella brasiliensis, Mugil curema, and Rhinosardinia bahiensis. Generalized linear models were constructed to test the influence of predictor variables on parasite richness and A. brasiliensis abundance. The predictor variables used in the models were the host relative condition factor (Kn), host length, collection season (rainy or dry), estuary, host species, total phosphorus, and chlorophyll a. Both parasite species richness and A. brasiliensis mean abundance showed a significant relation to water quality parameters, suggesting their possible use as environmental quality indicators.
Published Version
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