2017
DOI: 10.1051/kmae/2017026
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Native and exotic fishes in a Patagonian reservoir with rainbow trout cage culture: spatial and trophic resource use

Abstract: -Although the interactions of exotic salmonids with native Patagonian fishes are well known, little is known about the ecology and impact of farmed fish escapees. Salmonid production in Argentina is largely concentrated in the Alicurá reservoir in north Patagonia, where fish community studies have been scarce. Here, we assess and compare the spatial distribution, body size-condition and diet of the different fish species in this reservoir. Strong vertical segregation was observed between exotic rainbow trout O… Show more

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Cited by 5 publications
(5 citation statements)
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“…Damming and the creation of anthropogenic [94], but also natural, reservoirs-e.g., dams created by the Canadian beaver Castor canadensis [95]-have provided new conditions for galaxiid populations [18,96] and also a place for salmonid cage aquaculture. Farmed rainbow trout escapes have been recorded in the Alicura reservoir (Table S1) [88], with consequences for habitat use and food webs [89,90]. Contamination is a new issue for Patagonian waters, and recent results [97][98][99] have sounded an alarm.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Damming and the creation of anthropogenic [94], but also natural, reservoirs-e.g., dams created by the Canadian beaver Castor canadensis [95]-have provided new conditions for galaxiid populations [18,96] and also a place for salmonid cage aquaculture. Farmed rainbow trout escapes have been recorded in the Alicura reservoir (Table S1) [88], with consequences for habitat use and food webs [89,90]. Contamination is a new issue for Patagonian waters, and recent results [97][98][99] have sounded an alarm.…”
Section: Discussionmentioning
confidence: 99%
“…Established salmonid populations resulted in the partial displacement of several native Patagonian galaxiids species from their historical distribution ranges due to negative interactions such as competition and predation [33,87]. Furthermore, escaped farmed rainbow trout in reservoirs have been shown to negatively affect native populations [88][89][90].…”
Section: Climate Change Invasions and Translocationsmentioning
confidence: 99%
“…However, the creation of thermally resistant trout stocks must be carried out with caution, so as not to disturb wild population genetics by bringing about unintentional alterations to genetic lines (Crozier et al, 2019). Fish escapes from trout cages and their undesirable environmental effects are well documented (Cussac et al, 2014;Nabaes Jodar et al, 2017, 2020. Moreover, exotic trout and chars introduced into Northern Patagonia are in decline because of global warming (Aigo et al, 2008(Aigo et al, , 2014, which in terms of nature conservancy is an unexpected positive side effect that should not be disturbed.…”
Section: Introductionmentioning
confidence: 99%
“…Fish escapes from trout cages and their undesirable environmental effects are well documented (Cussac et al, 2014;Nabaes Jodar et al, 2017, 2020. Moreover, exotic trout and chars introduced into Northern Patagonia are in decline because of global warming (Aigo et al, 2008(Aigo et al, , 2014, which in terms of nature conservancy is an unexpected positive side effect that should not be disturbed.…”
Section: Introductionmentioning
confidence: 99%
“…Examples from farm escapes of aquaculture species, such as the rainbow trout Oncorhynchus mykiss suggests that hatchery individuals are capable of consuming a large variety of prey in the wild, some even indistinguishable from wild occurring rainbow trout, with diet also depends on season, size and dispersal distance from the originated fish farm that reflect a diet transition from aquaculture to wild (Nabaes Jodar et al, 2020; Rikardsen & Sandring, 2006). O. mykiss farm escapes was also found to have a broader dietary breadth than wild rainbow trout, although the diet included indigestible items as well (Nabaes Jodar et al, 2017). Yet, the diet of TGGG cannot be measured and compared in the same way as O. mykiss farm escapes, as there is no wild TGGG hybrids to allow direct dietary comparison and interpretation of differences of diet.…”
Section: Introductionmentioning
confidence: 99%