The effects of an experimental freshwater cage aquaculture operation on Mysis diluviana

Paterson, Michael; Podemski, Cheryl L.; Wesson, Laurie J.; Dupuis, Alain P.

doi:10.1093/plankt/fbq096

Cited by 13 publications

(31 citation statements)

References 27 publications

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“…It is very likely that the decline in oxy-thermal habitat (in 2008) was a major factor leading to the reduction of lake trout 3D KUDs in the post-production period compared with the production period (Table 1). Despite the observed declines in deep-water prey availability in Lake 375 and oxy-thermal habitat in the study lake (Paterson et al 2011), both of which should have promoted greater inter-specific habitat overlap, we observed limited habitat overlap between lake trout and escaped rainbow trout in the 4 yr of this study.…”

Section: Discussioncontrasting

confidence: 65%

“…Furthermore, lake trout are known to frequent commercial farms in Lake Huron (Johnston et al 2010), which we predicted they might also do in the present study, especially given the presence of minnows near the cage (P. J. Blanchfield unpubl. data), and declines in Mysis abundance in the latter years of aquaculture production (Paterson et al 2011). Stable isotope ana lyses confirmed that lake trout are predators of minnows, but also that they were not highly reliant upon waste feed (Wellman et al 2017).…”

Section: Discussionmentioning

confidence: 76%

“…The species-specific thermal tolerances resulted in significantly deeper depth selection for lake trout (~7 m) compared to rainbow trout (~3 m) that increased throughout the stratified period. Even though habitat overlap between escaped rainbow trout and lake trout was minimal, it was most likely amplified in the later years of this study as increasing levels of hypoxic water, a result of increased productivity in the lake from aquaculture operations and lack of complete turnover (Paterson et al 2011), forced lake trout into shallower depths. The addition of bubblers to Lake 375 in 2009 helped deliver oxygenated water to the hypolimnion and aided with spring turnover, resulting in a return of lake trout oxy-thermal habitat to normal levels (see Fig.…”

Section: Discussionmentioning

confidence: 93%

“…Lake 375 does not have a pelagic prey fish species but does contain the freshwater shrimp Mysis, which is an important prey for many lake trout populations (Vander Zanden & Rasmussen 1996). Mysis abundance declined throughout this study, almost to the point of disappearance (Paterson et al 2011). …”

Section: Study Area and Model Farmmentioning

confidence: 86%

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Site fidelity of escaped rainbow trout to an experimental freshwater aquaculture facility and habitat overlap with native fish fauna

Charles¹,

Blanchfield²,

Gillis³

2017

Aquacult. Environ. Interact.

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The distribution and habitat use of escaped farmed fish is often difficult to assess after their dispersal from commercial open-pen aquaculture facilities. We examined site fidelity of rainbow trout Oncorhynchus mykiss after release from an experimental farm (escaped fish) in a small lake, as well as habitat overlap (3D kernel utilization distributions) with a native salmonid, lake trout Salvelinus namaycush. Fish were implanted with telemetry transmitters, and their movements were monitored by acoustic arrays during (2006−2007) and after (2008−2009) commercial production. This latter period allowed for assessment of habitat use by escapees in the absence of any influence of cage production, simulating conditions similar to fallowing or longdistance dispersal. Escaped rainbow trout were regularly present at the cage site (23% of total positions) during production, typically at times of the day which coincided with feeding, but were rarely near the cage site (2% of total positions) during the post-production period, and instead greatly increased their occupancy of the near-shore region. Lake trout did not display an affinity to the cage site in either the production or post-production periods (~1% of total positions), and volumetric overlap with rainbow trout was relatively low throughout the entire study. Our results indicate that in the absence of ongoing production at commercial aquaculture operations, rainbow trout escapees can readily switch to foraging on native fauna in the near-shore regions of the lake and did not directly compete with native lake trout.

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Section: Discussioncontrasting

confidence: 65%

Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 93%

Section: Study Area and Model Farmmentioning

confidence: 86%

See 2 more Smart Citations

Site fidelity of escaped rainbow trout to an experimental freshwater aquaculture facility and habitat overlap with native fish fauna

Charles¹,

Blanchfield²,

Gillis³

2017

Aquacult. Environ. Interact.

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“…Following the initiation of the cage farm operation for rainbow trout (Oncorhynchus mykiss), concentrations of many nutrients, phytoplankton, and densities of fish increased (Bristow et al 2008;Mills et al 2008;Findlay et al 2009). Numbers of benthic invertebrates, as well as an important invertebrate zooplankton predator, Mysis diluviana (formerly Mysis relicta (Audzijonyte and Vainola 2006), and hereafter referred to as Mysis), declined along with hypolimnetic O 2 concentrations (Paterson et al 2010). Similar changes were not observed in the reference lakes.…”

Section: Introductionmentioning

confidence: 77%

The response of zooplankton in a whole-lake experiment on the effects of a cage aquaculture operation for rainbow trout (Oncorhynchus mykiss)

Paterson

Podemski

Findlay

et al. 2010

Can. J. Fish. Aquat. Sci.

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There is hope that increased development of aquaculture will help meet future global needs for protein. The growth of the freshwater aquaculture industry in Canada, however, has been hampered by insufficient information on environmental impacts. We examined the effects of an experimental cage aquaculture operation for rainbow trout (Oncorhynchus mykiss) on planktonic Crustacea and rotifers using 6 years of precage and 7 years of postcage data. Following the initiation of aquaculture, total crustacean and rotifer biomass, egg production, and depth distributions did not change significantly when compared with data from three nearby unimpacted lakes. We found statistically detectable increases in densities of Bosmina cf. longirostris and Diacyclops thomasi and an overall change in crustacean zooplankton community structure using correspondence analysis. The response of zooplankton was less than we expected because comparatively large changes were observed in phytoplankton biomass, hypolimnetic O2, and densities of invertebrate (Mysis diluviana) and fish predators. Our study emphasizes the need to monitor multiple variables when assessing the ecosystem impacts of potential stressors such as aquaculture.

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Does the Ice Age legacy end in Central Europe? The shrinking distributions of glacial relict crustaceans in Lithuania

Audzijonyte,

Arbačiauskas,

Smith

2023

Aquatic Conservation

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Glacial relict crustaceans are characterized by their affinity for cold and well‐oxygenated waters and their limited dispersal ability. They occur in large, deep lakes of Northern and Central Europe and North America, with their distributions shaped by glaciation events. In many countries and especially along the southern distribution edge, glacial relict populations are declining as a result of eutrophication, global warming, and possible adverse interactions with invasive Ponto‐Caspian crustaceans. This study assessed the status of three glacial relict malacostracan species (the amphipods Monoporeia affinis and Pallaseopsis quadrispinosa and the mysid Mysis relicta) in Lithuania and modelled their abundance across environmental variables, including the presence of Ponto‐Caspian malacostracans. The results showed that M. affinis is probably extinct in the country, whereas M. relicta was found in only nine out of 16 locations from which it was previously recorded. The distribution of P. quadrispinosa also seems to be shrinking. The annual water renewal rate (P. quadrispinosa and M. relicta) and lake depth (P. quadrispinosa) were significantly and positively associated with the relative abundance of relict mysids and amphipods, but no association was found with lake size or with the presence of invasive Ponto‐Caspian crustaceans. Both species were less abundant in samples collected in the 21st century compared with the 20th century. Given the biogeographical and ecological importance of glacial relict crustaceans, their widespread declines are of concern and point to the deterioration of habitat quality, essential for other species with similar requirements. Urgent action is needed to improve water conditions and safeguard these communities. In cases where water quality improves, the reintroduction of extirpated relict populations should be considered. One example is Lake Drūkšiai, where these crustaceans became extinct during the operation of the Ignalina nuclear power plant but where conditions improved following the closure of the power plant in 2009.

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The effects of an experimental freshwater cage aquaculture operation on Mysis diluviana

Cited by 13 publications

References 27 publications

Site fidelity of escaped rainbow trout to an experimental freshwater aquaculture facility and habitat overlap with native fish fauna

Site fidelity of escaped rainbow trout to an experimental freshwater aquaculture facility and habitat overlap with native fish fauna

The response of zooplankton in a whole-lake experiment on the effects of a cage aquaculture operation for rainbow trout (Oncorhynchus mykiss)

Does the Ice Age legacy end in Central Europe? The shrinking distributions of glacial relict crustaceans in Lithuania

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