The degradation of fish-cage waste in sediments during fallowing

McGhie, Tony K.; Crawford, Christine; Mitchell, I; O'Brien, Dominic

doi:10.1016/s0044-8486(00)00317-3

Cited by 93 publications

(42 citation statements)

References 16 publications

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“…Several studies have reported that nitrogen and phosphorus released from fish cage can affect chemical parameters of sediment (Beveridge 1996;Zhang et al 2004;Yan 2005;Porrello et al 2005;Kullman et al 2007). Thus, monitoring of nutrients concentration in water and sediment during culture and fallowing periods could be useful for management of sustainable fish culture, such as obtaining the optimal time for fallowing, i.e., the duration required for the sediment to recover (Bron et al 1993;McGhie et al 2000;Macleod et al 2004Macleod et al , 2006Pereira et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Assessment effects of cage culture on nitrogen and phosphorus dynamics in relation to fallowing in a shallow lake in China

Li-wei

Xie

et al. 2008

Aquacult Int

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Nitrogen and phosphorus dynamics in relation to fallowing in a fish cage farm was investigated in a shallow lake in China. Four sampling sites were set: beneath the cages, at the cage sides, and 50 and 100 m east of the cage farm. Total nitrogen (TN) and total phosphorus (TP) in lake water and sediment were analyzed during a 2-year rearing cycle. The cage culture had a fish yield of 16.3-39.2 tonnes in the study period. Based on the mass balance equation, 1533-3084 kg TN and 339-697 kg TP were contributed to the lake environment. Nitrogen and phosphorous concentrations showed greater increase in the first culture period than in the second rearing cycle. No obvious changes were found at the sampling sites 50 and 100 m east of the cages during the study periods. Main impacts were found close to the cages (beneath the cages and at the cage side); the sampling points at the cage side showed relatively high TN and TP sedimentation. After 3 months of fallowing, water TN and TP decreased significantly but the sediment TN and TP contents remained high. Therefore, recovery seems to happen during fallowing but attention should be paid to whether the culture continues to operate in the future.

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Section: Introductionmentioning

confidence: 99%

Assessment effects of cage culture on nitrogen and phosphorus dynamics in relation to fallowing in a shallow lake in China

Li-wei

Xie

et al. 2008

Aquacult Int

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“…Stable isotopes appear to be a promising tool for assessing patterns in dispersal of waste from fish farms (McGhie et al 2000, Jones et al 2001, Burford et al 2003, Sarà et al 2004, Vizzini & Mazzola 2004. Hobson (1999) argued that stable isotopes are the most powerful tools available to trace organic matter for several fields of ecological research, and others have recommended their use in pollution studies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Use of stable isotopes to investigate dispersal of waste from fish farms as a function of hydrodynamics

Sarà¹,

Scilipoti²,

Milazzo³

et al. 2006

Mar. Ecol. Prog. Ser.

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Stable isotopes were used to examine differential effects of fish farm waste on the water column and sediments. To achieve this objective, we chose 3 marine fish farms located along the coast of Sicily (Mediterranean Sea) as point-source disturbances, and a control area. The hypothesis that carbon and nitrogen isotope composition of particulate (POM) and sedimentary (SOM) organic matter varied with increasing distance (from cages to 1000 m) was tested at 3 levels of hydrodynamics: low (mean velocity of current [MVC] ~12 cm s

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“…High deposit rates may cause an accumulation of organic detritus in the sediment if removal by physical, chemical and biological means cannot assimilate such an input. Usually the accumulation of organic output is confined to the area directly beneath the net-pens and its immediate surroundings (Henderson et al 1997, McGhie et al 2000. Such high waste inputs can produce strong changes in the structure of benthic com-munities (Mazzola et al 1999, Karakassis et al 2000, Mirto et al 2002 and may even result in the formation of bacterial mats and anoxic conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of wild fishes on waste exportation from a Mediterranean fish farm

Vita¹,

Marín²,

Madrid³

et al. 2004

Mar. Ecol. Prog. Ser.

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This study investigated the role of wild fishes associated with marine farms as potential consumers of organic waste in the water column and sediment. Experiments were carried out at a fish farm in a semi-enclosed bay in the Mediterranean Sea (SE Spain). Sediment traps collected organic waste from net-pens in the water column at different depths during June and July 2001 and benthic caging experiments were carried out on the sediment from October 2000 to January 2001. The experiment showed that about 80% of the particulate organic matter leaving the rearing net-pens may be consumed before it settles on the sediment. Significant changes in the nutrient quality of the organic matter exported are also due to consumption by wild fishes. Wild fishes thus play an important role in recycling the organic matter of the sediment, and regulate the benthic community structure. Our results indicate that the trophic role of wild fishes should be considered when evaluating the environmental impact of fish farms.

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The degradation of fish-cage waste in sediments during fallowing

Cited by 93 publications

References 16 publications

Assessment effects of cage culture on nitrogen and phosphorus dynamics in relation to fallowing in a shallow lake in China

Assessment effects of cage culture on nitrogen and phosphorus dynamics in relation to fallowing in a shallow lake in China

Use of stable isotopes to investigate dispersal of waste from fish farms as a function of hydrodynamics

Effects of wild fishes on waste exportation from a Mediterranean fish farm

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