Parasitism, although the most common type of ecological interaction, is usually ignored in food web models and studies of trophic connectivity. Stable isotope analysis is widely used in assessing the flow of energy in ecological communities and thus is a potentially valuable tool in understanding the cryptic trophic relationships mediated by parasites. In an effort to assess the utility of stab...

We analyzed 54 specimens of Hoplias aff. malabaricus (Bloch, 1794) collected between March 2010 and March 2011 from the upper Paraná river Neotropical floodplain, Brazil. All hosts were parasitized by at least one species of Monogenea. The parasites species with higher prevalence were Urocleidoides cuiabai Rosim, Mendoza-Franco & Luque, 2011 (96.29 %) and U. malabaricusi Rosim, Mendoza-Franco &...

In a recent paper, ‘Experimental elimination of parasites in nature leads to the evolution of increased resistance in hosts’, Dargent et al. [1] reported on a transplant experiment using wild guppies, Poecilia reticulata. Fish were collected from a source population in a downstream, high productivity site where they experienced parasitism and predation. They were held in the laboratory and chem...

During the culture of wild-caught plaice, Pleuronectes platessa L. gross skin lesions and patches of dark brown pigmentation were observed on the ocular side of the fish. Mortality increased approximately nine months a er capture, and a er 10 months, 21 of the 27 fish had died. The presence of Gyrodactylus unicopula (Glukova 1955) was demonstrated by histology and light microscopy studies of sk...

Nematodes from the superfamily Ascaridoidea (families Anisakidae and Raphidascarididae) are worldwide distributed parasites. Their live cycles include many species of water invertebrates and teleostean fish as intermediate hosts, and fish, sea mammals or fish-eating birds being definitive hosts. Humans can be infected with some of these parasites after consumption of raw or wrongly processed fi...

This study investigated the parasites of three species croakers (Pennahia anea, Panna microdon, and Johnius argentatus) their effect on host’s tissues. Fish samples were collected directly from local fishermen fish landing station Saint Martin’s Island, Bay Bengal a regular monthly basis. A total 448 individuals which nine identified including crustaceans, four nematodes, one pentastomida, acan...

Some parasites are known to bioaccumulate some environmental pollutants within their host. We hypothesized that these may be beneficial for hosts in polluted environments. experimentally increased long-term (five weeks) exposure polycyclic aromatic hydrocarbons (PAHs, three levels: 0.1X, 1X, 10X exposure) European chubs (Squalius cephalus) were naturally infected or uninfected with acanthocepha...

In this study, sea bass (Dicentrarchus labrax, Linnaeus, 1758),  gray mullet (Chelon labrosus,  Aisso, 1826), bream  (Spanus aurata, L. 1785) and carp (Cyprinus carpio, L. 1758) supplied from Bafa Lake from October 2013 to February 2014, underwent a parasitological examination for helminth parasites. In total 86 fish were examined and four helminth species (Diplactanum aequans, H...

The continuing decline of ocean fisheries and rise of global fish consumption has driven aquaculture growth by 10% annually over the last decade. The association of fish farms with disease emergence in sympatric wild fish stocks remains one of the most controversial and unresolved threats aquaculture poses to coastal ecosystems and fisheries. We report a comprehensive analysis of the spread and...

In the present study, we reported infection with eighteen species of the genus Dactylogyrus, belong to thefamily Dactylogyridae from five breeder fish species, including common carp (Cyprinus carpio), grass carp(Ctenopharyngodon idella), silver carp (Hypophthalmichthys molitrix), big head carp (Hypophthalmichthysnobilis) and black carp (Myelopharyngodon piceus) which introduced and imported to ...