Into the wild: escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey

Jodar, Diego N. Nabaes; Cussac, Víctor E.; Becker, Leandro Aníbal

doi:10.1007/s10750-019-04075-2

Cited by 5 publications

(8 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%

“…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%

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New Insights into the Distribution, Physiology and Life Histories of South American Galaxiid Fishes, and Potential Threats to This Unique Fauna

et al. 2020

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South American galaxiids occupy both Patagonia and the ichthyogeographic Chilean Province, encompassing glacial Andean deep lakes, shallow plateau lakes, reservoirs, short Pacific rivers and long Atlantic rivers. The total fish fauna includes 29 species, comprising Neotropical fishes (siluriforms and characids), galaxiids, percichthyids, atherinopsids and mugilids, two lamprey species, and several exotic fishes (salmonids, Gambusia spp. and common carp). The family Galaxiidae shares a common ancestry with the Gondwanan temperate fish fauna, played a major role in the post-glacial colonization of Andean lakes and streams, and contributes key species to the food webs. Galaxiid species occupy an enormous latitudinal gradient, show a wide variety of life history patterns and are the southernmost native freshwater fishes of the world. Knowledge of South American galaxiids has improved notably, but new challenges arise due to climate change, biological invasions, damming, aquaculture and contamination. In this changing environment, the future of South American galaxiids should be carefully considered as a legacy of the old Gondwana and a unique attribute of the freshwaters of southern South America.

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Section: Discussionmentioning

confidence: 99%

Section: Climate Change Invasions and Translocationsmentioning

confidence: 99%

New Insights into the Distribution, Physiology and Life Histories of South American Galaxiid Fishes, and Potential Threats to This Unique Fauna

et al. 2020

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“…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%

Thermal effects in rainbow trout (Oncorhynchus mykiss) F1 embryos (farmed female × wild thermal‐resistant male)

Crichigno

Orellana

Larraza

et al. 2021

Journal of Fish Biology

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The aim of this work was to investigate the response of rainbow trout embryos (Oncorhynchus mykiss) (i.e., survival, size at hatching, time to hatching, malformations) to four incubation temperatures (5.8, 8.9, 14.0 and 16.8 C), taking into account the origin of the male parental genome and comparing pure farmed and F1 embryos (farmed female × wild thermal-resistant male). Several consequences of thermal stress were observed: lower accumulated thermal units (ATU) at hatching at high temperatures, and lower survival, shorter hatched free embryos and less-consumed yolk sac at extreme temperatures. The effect of the thermal-adapted male parental genome was shown only in the lower percentage of incompletely hatched free embryos in the F1 families. It appears that to obtain greater modification of thermal performance during early development, the adapted genome of the wild thermalresistant population has to be included through maternal inheritance, thus producing a stabilized strain selected for domesticity, growth and thermal adaptation.

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“…This finding do not coincide with our hypothesis, where we speculated higher overlap of dietary niche between TGGG and Epinephelus spp. as suggested from other farm escape examples (Nabaes Jodar et al, 2020). One possible explanation for such differences is that most dietary studies on farm escapes or Epinephelus spp.…”

Section: Discussionmentioning

confidence: 96%

Distinct resource utilization by introduced man-made grouper hybrid: an overlooked anthropogenic impact from a longstanding religious practise

Chung,

Schunter

2023

Preprint

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Anthropogenic activities, such as non-native aquaculture species introduction have been considerably altering trophic interactions in marine ecosystems. The hybrid grouper (TGGG), an aquaculture product originated from artificial F1 crossbreed between Epinephelus fuscoguttatus and E. lanceolatus, have been released in the wild through religious activities, raising concerns about this man-made introduced species. The carnivorous diet, together with large body size inherited from the parental species have made TGGG a candidate that could pose significant impacts to the marine ecosystem. Yet, little is known about the diet composition of TGGG upon release into the natural environment, and any dietary overlap or partition with closely related endemic species. Here, we deploy gut content DNA metabarcoding to determine the prey richness and dietary niche of wild caught TGGG and compare with four native grouper species (Epinephelus awoara, E. bleekeri, E. coioides and E. quoyanus). The TGGG exhibited six unique prey taxa with teleosts being the major taxa preyed upon followed by crustaceans and cephalopods and displayed significant lower mean number of pray taxa compared to other groupers. The TGGG exhibits a significantly different diet composition, possibly indicating a diet transitioning and acquiring new feeding behavior. This study provides a comprehensive analysis with high taxonomic resolution on the diet of artificial hybrids in the wild, suggesting possibility of introduction success if release events persist. Finally, these findings provide new information on how local trophic dynamics are impacted by under-investigated release of animals through religious practices.

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Into the wild: escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey

Cited by 5 publications

References 86 publications

New Insights into the Distribution, Physiology and Life Histories of South American Galaxiid Fishes, and Potential Threats to This Unique Fauna

New Insights into the Distribution, Physiology and Life Histories of South American Galaxiid Fishes, and Potential Threats to This Unique Fauna

Thermal effects in rainbow trout (Oncorhynchus mykiss) F1 embryos (farmed female × wild thermal‐resistant male)

Distinct resource utilization by introduced man-made grouper hybrid: an overlooked anthropogenic impact from a longstanding religious practise

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