Abstract A key benefit of sociality is a reduction in predation risk. Cohesive group behaviour and rapid collective decision making are essential for reducing risk groups. Parasite infection might reduce an individuals’ grouping behaviours thereby change the as whole. To investigate relationship between parasite behaviours, we studied groups three-spined sticklebacks, Gasterosteus aculeatus , v...

Prochilodus nigricans is extensively exploited in fishing and aquaculture activities the Brazilian Amazon, it definitive host for Neoechinorhynchus curemai Noronha, 1973. Thus, present study aimed to evaluate occurrence of N. P. parasite-host relationship three rivers (Juruá, Crôa Môa) municipality Cruzeiro do Sul, state Acre, Brazil. Fish were caught, weighed, measured, subjected necropsy, gas...

We observed the behavior and ecology of Chaetodon capistratus infected and uninfected with the ectoparasitic isopod Anilocra chaetodontis to assess whether there may be parasite induced alterations in host biology, host defenses against infection, and/or pathology related to infection. We also examined habitat related differences in infection rates. Infected fish had higher rates of interaction...

INTRODUCTION Intertidal rock pools where fish and invertebrates are in constant close contact due to limited space and water level fluctuations represent ideal conditions to promote life cycles in parasites using these two alternate hosts and to study speciation processes that could contribute to understanding the roles of parasitic species in such ecosystems. MATERIAL AND METHODS Gall bladde...

In this study we examine differences in the occurrence of life history stages of the destructive fish ectoparasite Argulus foliaceus (L., 1758) on eight fish species (stickleback, rudd, roach, gudgeon, bream, tench, crucian carp and common carp) sampled from a mixed-species recreational fishing lake on nine occasions during late spring and summer. Total numbers ofA. foliaceus, as well as the nu...

Between October 2001 and March 2002, 103 specimens of A. tricolor from Angra dos Reis (23 degrees 01' S, 44 degrees 19' W), in the coastal zone of the State of Rio de Janeiro, Brazil, were analyzed in order to study their metazoan parasite infracommunities. Ten species of metazoan parasites were collected: 4 digeneans, 1 cestode, 1 acantocephalan, 2 nematodes, 1 copepod, and 1 hirudinean; 77.7%...