The risk of parasite transfer to juvenile fishes by live copepod food with the example Triaenophorus crassus and Triaenophorus nodulosus

Infestation of zooplankton with Triaenophorus and Proteocephalus procercoids (Cestoda) in a deep oligotrophic lake

“…Although all C. lavaretus and ~16% of S. umbla investigated in Lake Achensee were infested with T. crassus (Schähle et al, 2014), the prevalence of the parasites was low (0.38%; maximum infection rate, 3.7%; Fig. 2), but comparable to studies from several lakes in Austria (Lahnsteiner et al, 2009;Sichrowsky et al, 2013;Schaufler et al, 2014), France (Hanzelova and Gerdeaux, 2003) or Canada (Watson and Lawler, 1965). In Lake Fuschlsee, for example, up to ~2% (mean 0.4%) of the C. abyssorum population were infested with Triaenophorus procercoids (Sichrowsky et al, 2013).…”

“…2). This is relatively late in the year compared to the first procercoid occurrence in other Austrian lakes (from mid-May to beginning of June; Lahnsteiner et al, 2009;Sichrowsky et al, 2013;Schaufler et al, 2014), but corresponds with the lower water temperature found in our study system. In Lake Achensee, highest infection rates of Triaenophorus spp.…”

“…In Lake Fuschlsee, for example, up to ~2% (mean 0.4%) of the C. abyssorum population were infested with Triaenophorus procercoids (Sichrowsky et al, 2013). The high infection rate reported in Lake Mondsee (up to 38.7%) could be explained by the determination technique of the procercoids, as the parasites were counted without distinguishing different cestode genera (Lahnsteiner et al, 2009). In Lake Achensee, the prevalence of Proteocephalus infection was relatively high (1.34%), however, the maximum total cestode infection rate made up to ~11%, with an infestation peak reached in mid-July (Fig.…”

“…Occurrences of the whitefish tapeworm Triaenophorus Rudolphi, 1793 (Cestoda: Pseudophyllidea) have been observed in Central and Western European (Brinker and Hamers, 2007), Scandinavian (Pasternak et al, 1999;Pulkkinen et al, 2000), as well as North American lakes (Ekbaum, 1935;Miller, 1952;Watson and Lawler, 1965;Hursky and Pietrock, 2012). Recently, these parasites have also been reported in some Austrian lakes (Lahnsteiner et al, 2009;Sichrowsky et al, 2013) where they caused epidemics in the Arctic charr (Salvelinus umbla) population (Achleitner et al, 2009;Schaufler et al, 2014). Members of the genus Triaenophorus have a complex three-host life cycle, with copepods as their first, planktivorous fish like coregonids as their second intermediate host, and pike (Esox lucius) as their definitive host (Kuperman, 1981).…”

Freshwater bivalves rearing: a brief overview

“…Fish conservation aquaculture is primarily focused on habitat improvement, biological cycle and natural reproduction and secondarily on population genetic status characterization, to preserve natural genetic diversity. Nowadays in freshwater ecosystems these techniques of conservation aquaculture are very well established and consolidated for fish species, as the case of European salmon (Salmo salar) (Stefansson et al 2003;Maynard et al 2004), native Salmonids in Italy (Sicuro et al 2006), in Austria (Lahnsteiner et al 2009), Danubie salmon (Huco huco) in Romania (Jungwirthi et al 1989), sturgeons in Europe (Steffens et al 1990;Bronzi et al 1999) and in Russia (Secor et al 2000;Chebanov and Billard 2001). Conservation aquaculture embraces extensive aquaculture techniques and particular attention is addressed for reproduction and larval growth that are most critical phases in the aquatic animal population management (Maynard et al 2004;Olson et al 2004).…”