Predation and parasitism are two of the most important sources of mortality in nature. By forming groups, individuals can gain protection against predators but may increase their risk of being infected with contagious parasites. Animals might resolve this conflict by forming mixed-species groups thereby reducing the costs associated with parasites through a relative decrease in available hosts....

During the years 2004-2006 the parasitological autopsies of three species of fish: roach Rutilus rutilus (L.), bream Abramis brama (L.) and perch Perca fluviatilis L. from three lakes situated in warmińsko-mazurskie voivodeship were done. The aim of this study was comparable analysis of Metazoan parasite communities which occur in roach, bream and perch in three lakes of river Łyna watershed. T...

We present a model for a host-parasite system in which parasites affect the economy of fish farming. The fish is sea-bass, Dicentrarchus labrax, and the parasite is a helminthic ectoparasite, Diplectanum aequans, which adheres to the branchiae of the host and, when present in sufficient number, kill it by suffocation. The improved model incorporates two important features observed in the fish f...

Myxosporea parasitize many organs in fresh and saltwater fish. Species of the genus Myxobolus parasitizing the gills and other organs of the tambaqui Colossoma macropomum have been described. In the present study, blood smears were made from juvenile tambaqui and were stained with May Grunwald-Giemsa-Wright in order to identify myxozoan parasites. Out of a total of 36 fish examined, one specime...

Emerging Infectious Diseases Vol. 6, No. 4, July–August 2000 430 During a survey of parasitic helminths of wild vertebrates from Tres Palos Lagoon, in Guerrero, Mexico, we found Gnathostoma sp. advanced third-stage larvae (AdvL3) in the skeletal muscle of several fish species. Fish were caught from March to August 1999 in Tres Palos Lagoon (16° 41' to 16° 50'N and 99° 37' to 99° 47'W), Acapulco...

IN EARLY APRIL 19'61 while I was looking for parasitic copepods in fish specimens preserved in our specimen gallery, I discovered ·twO different kinds of parasite coexisting on a single flat-fish, Pseudopleuronectis americanus Walbaum (26.5 cm long). Some of them, 19 in number, were found on the inner margin of the operculum, and have been identified as the present new species. The other 22 ind...

We assessed mercury levels in the feathers of little tern (Sternula albifrons) chicks from hatching to fledging and in their prey captured by adults in three main foraging habitats: lagoon, salinas, and adjacent sea. These data were used to model mercury concentration in chick feathers through food ingestion, in order to explore the effects that changes in diet would have on the mercury burden ...