An Evaluation of Proposed Cage Fish Culture on Loch Lomond, an Important Reservoir in Central Scotland

Beveridge, M. C. M.; Muir, J. F.

doi:10.4296/cwrj0702181

Cited by 15 publications

(5 citation statements)

References 5 publications

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“…The influence of physical site-specific characteristics, such as water exchange and bottom dynamic conditions, on the eutrophication effect in the recipient has been discussed by Hskanson (1986). Studies have shown enrichments of organic matter and nutrients in surrounding waters and sediments, oxygen depletion within cages, and qualitative and quantitative changes of the pelagic and benthic biota around and below farms (Beveridge & Muir 1982, Korzeniewslu & Korzeniewska 1982, Penczak et al 1982, Enell & Lof 1983, Enell 1985, Ervik et al 1985, Phillips et al 198513, Rosenthal 1985, Trojanowski et al 1985, Persson 1986, Brown et al 1987, Aure et al 1988. Most of these studies were carried out in fresh or (in one case) brackish waters, and very few of them attempted to quantify the efflux of solutes from particles deposited on the bottom and the accumulation of material in the sediment.…”

Section: Introductionmentioning

confidence: 99%

Chemical fluxes and mass balances in a marine fish cage farm. I Carbon

Hall¹,

Anderson²,

Holby³

et al. 1990

Mar. Ecol. Prog. Ser.

252

158

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Carbon fluxes in a marine trout cage farm in the Gullmar Fjord, western Sweden, were measured to investigate how much of the carbon supplied to the farm was recovered in harvest, how much was lost to the environment, and the properties and fate of this environmental loss. The measured fluxes included fish food, juveniles, harvest, fish loss (death and escape), sedimentation from the cages, and benthc release measured with diver-operated flux chambers and a gas collection unit in situ. Carbon mass balances for the farm, based on the measured fluxes (flux method), were constructed for each of 2 consecutive growing seasons. Another mass balance (accumulation method) was based on the total carbon input with food and juveniles to the farm since it was started, the removal of carbon with harvested fish and fish loss, and the recovery of carbon in the sediment originating from the farm after 7 growing seasons. Some 21 to 22 % of the total carbon input to the farm was recovered in harvest, fish loss constituted 1 to 3 %, and 75 to 78 % (or 878 to 952 kg C per tonne of fish produced) was lost to the aquatic environment. On a seasonal basis and of the carbon input to the farm, solute release from the cages (probably CO2 produced during fish respiration and excreted urea) removed 4 to 49 %, sedimentation of faeces and excess food removed 29 to 71 %, flux from the farm sediment of dissolved and gaseous carbon (total carbonate [C,], methane and dissolved organic carbon) transferred 2 to 6 O/o back to the overlying water, and 23 to 69 % was accumulated in the sediment. (Ranges of values represent inter-seasonal variability.) The long-term (7 seasons) sediment accumulation of carbon amounted to 18 'Yo of the total carbon input to the farm. Of the carbon deposited on the sediment surface 3 to 20 '/o was released back to the overlying water seasonally. C, dominated the annual benthic fluxes. Loss to the environment of dissolved carbon [the sum of solute release from the cages and benthic flux) amounted to between 6 and 55 % of the carbon input to the farm (or 9 to 71 'X of the total environmental loss) on a seasonal basis, and 5 8 % (or 76% of the total environmental loss) on a long-term basis. This study constitutes the first step in an assessment of the eutrophication caused by the fish farm.

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Section: Introductionmentioning

confidence: 99%

Chemical fluxes and mass balances in a marine fish cage farm. I Carbon

Hall¹,

Anderson²,

Holby³

et al. 1990

Mar. Ecol. Prog. Ser.

252

158

View full text Add to dashboard Cite

show abstract

“…L. Awe & L. Earn) where the environmental impact on the water body as a whole is likely to be slow to develop because of the large physical 'buffering' (Bailey-Watts & Duncan, 1981). Nevertheless, there is concern about eutrophication where cage farming in lochs used for supplying drinking water, such as Loch Lomond, has been proposed (Beveridge & Muir, 1982).…”

Section: Introductionmentioning

confidence: 99%

Impact of intensive cage fish farming on the phytoplankton and periphyton of a Scottish freshwater loch

Stirling

Dey

1990

Hydrobiologia

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Nutrients, phytoplankton and periphyton were monitored in a 71 ha shallow, unstratified lake used for intensive cage culture of rainbow trout. Inorganic nitrogen, ortho-phosphate and suspended solids were significantly higher near the cages and the bottom and, although declining during summer, nutrients did not reach levels which limit phytoplankton growth. Microcystis aeruginosa dominated the phytoplankton, with surface chlorophyll a reaching 189 g 1-in August, but with no subsequent bloom collapse or deoxygenation. A sub-dominant community of 'vernal' diatoms and Pediastrum spp. persisted. Periphyton was dominated by Melosira italica-subarctica. Algal species and water quality showed the lake to be highly eutrophic. Chlorophyll values predicted from a phosphorus-dependent eutrophication model agreed with observations but light limitation by self-shading and suspended farm wastes, aided by wind-induced turbulence, is believed to control algal growth rates and biomass. Implications for environmental management of intensive freshwater cage farms are discussed.

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“…• Todos los autores, coinciden en señalar que el principal problema en el cultivo de jaulas flotantes, es generado por el enriquecimiento en nutrientes y materia orgánica disuelto o en forma de partículas. La introducción en el ambiente de nutrientes y piensos, que acompaña siempre a las operaciones de explotación intensiva, es quizás elemento que más impacta el medio en que se desarrolla este tipo de producciones, muchos autores han mencionado las pérdidas de piensos desde los años 70 (Beveridge y Muir, 1982).…”

Section: Resultsunclassified

Impacto Ambiental en La Actividad Acuícola De Jaulas Flotantes

Cruz,

Frisancho,

Zapana

et al. 2023

JER

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An Evaluation of Proposed Cage Fish Culture on Loch Lomond, an Important Reservoir in Central Scotland

Abstract: PnoposaLs to farrn z.ainbou tz'out (Salmo gaiTdnez,i)

Cited by 15 publications

References 5 publications

Chemical fluxes and mass balances in a marine fish cage farm. I Carbon

Chemical fluxes and mass balances in a marine fish cage farm. I Carbon

Impact of intensive cage fish farming on the phytoplankton and periphyton of a Scottish freshwater loch

Impacto Ambiental en La Actividad Acuícola De Jaulas Flotantes

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