Otoliths preserve a continuous record of the life cycle from the natal through the adult stage. For that reason, the morphological and chemical characteristics of otoliths of two nonnative Salmonids, brown trout (Salmo trutta) and brook charr (Salvelinus fontinalis) from populations on the Kerguelen Islands were compared. Several approaches were used to study the relationships between otolith m...

A study of the Helminth parasites of fish of River Swat was conducted from September, 2012 to August, 2013. A total of 250 fish belonging to five genera and six species were examined. The parasites collected were Diplozoon khyberensis, Bathybothrium rectangulum, Bothriocephalus, Nippotaenia, Cucullanidae, Proteocephalus, Rhabdochona charsaddiensis, Rhabdochona schizothoracis and Neoechynorhynch...

The scolex surface of the mature spathebothriidean Cyathocephalus truncatus (Pallas, 1781), a parasite of the brown trout Salmo trutta fario L., was studied using scanning and transmission electron microscopy. A particular attention was paid to microtriches, unique structure on the surface of the Cestoda. The scolex of C. truncatus is covered with two types of filiform microtriches (filitriches...

In this study we evaluated effects of surfactants on motility parameters and DNA integrity of spermatozoa of freshwater teleost fish. Common carp (Cyprinus carpio) and brown trout (Salmo trutta fario) spermatozoa were exposed to either sodium dodecyl sulphate (SDS, anionic surfactant) or octoxynol 9 ( Triton X-100, nonionic surfactant). Both surfactants added at activation caused a decrease in ...

Atlantic salmon Salmo salar L. and brown trout trutta fario are species of high socio-economic ecological value. Declining populations make them target fisheries management. This paper reviews the direct effects deficient longitudinal connectivity, changes in discharge, water temperatures, oxygen depletion, chemistry increasing loads fine sediment on critical life stages spawning, egg incubatio...

The Pô River basin of northern Italy is the home of distinctive and endemic morphological forms of brown trout Salmo trutta. We used PCR-direct sequencing and RFLP techniques to study variation in the mitochondrial control region of 225 trout in order to assess genetic relatedness among 18 populations from that region. The distribution analysis of these genotypes among north Italian populations...