Regulating the local environmental impact of intensive, marine fish farming

Hansen, Pia Kupka; Ervik, Arne; Schaanning, Morten; Johannessen, Per; Aure, Jan; Jahnsen, Terje; Stigebrandt, Anders

doi:10.1016/s0044-8486(00)00520-2

Cited by 80 publications

(25 citation statements)

References 25 publications

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“…The Binvestigation is conducted in the local impact zone and includes parameters of three groups. Finally, the C-investigation is concerned with the benthic community structure in the mid-and regional-impact zones (Hansen et al, 2001;Stigebrandt et al, 2004). The B-investigation type, which is used in the measurement of the local impact of cage operations and combines three group parameters (b iological, chemical, sensory), is preferred by v irtue of its ease of use, ability to be applied frequently and possibility of use in areas of concentrated environmental impact.…”

Section: Sediment-focused Environmental Impact Of Rainbow Trout (Oncomentioning

confidence: 99%

“…A scoring system for the environ mental condition of the sediment was perfo med according to Hansen et al (2001). Firstly, macrofauna was observed in the sediment by sieving the sediment through a 1mm s ieve and the materials remain ing on the mesh screen were identified.…”

Section: Determination Of the Mean Score Of The Sedimentmentioning

confidence: 99%

“…The sediment conditions are found as follows: Mean score ≤ 1: condition 1, 1 < mean score ≤ 2: condition 2, 2 < mean score ≤ 3: condition 3 and mean score > 3: condition 4. The first three categories each corresponds to a degree of exploitation and the values of fourth category are considered to describe unacceptable sediment conditions (Hansen et al, 2001).…”

Section: Determination Of the Mean Score Of The Sedimentmentioning

confidence: 99%

“…As the amount of organic matter in the sediment increases, sensory parameters indicate differences in the colour and odour of the sediment, gas bubbles, and the thickness of the deposits in the top layer of the sediment (Hansen et al, 2001).…”

Section: Determination Of the Mean Score Of The Sedimentmentioning

confidence: 99%

“…Group 2 is taken into account for acceptable and unacceptable conditions when the conditions of Group 2 and 3 differs. Condition 4 is equivalent to unacceptable sediment conditions according to each group of parameters (Hansen et al, 2001).…”

Section: Determination Of the Environmental Condition Of The Sedimentmentioning

confidence: 99%

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Kaya¹,

Pulatsü²

2017

Turk. J. Fish. Aquat. Sci.

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This study aimed to evaluate environmental sediment quality parameters (biological, chemical, sensory) and determine sediment quality parameters (organic matter, total nitrogen, total phosphorus, t otal carbon) in rainbow trout cage farms with a nearly 4,000-ton total production capacity in Almus Reservoir. For this purpose, two cage stations representative of the cage farm area and two control stations outside of the main current, located at 250 m and 500 m respectively from the cage stations, were selected. The results suggest that the sediment condition is "unacceptable" with regard to biological parameter. The environmental condition of the cage station sediment compared to the control stations with regard to chemical and sensory parameters were determined to be "transition area" and "partially acceptable", respectively. The organic matter and total nitrogen of the cage station sediment were found to be 1.23 and 1.70 times greater than that of the control stations, respectively. When compared to the control stations, the total phosphorus and total carbon concentrations in the cage sediments showed 1.40-fold increasess in April and October 2015. It is thought that the methods and results of this study will contribute to sediment-focused research related to the sustainability of cage farming in inland waters.

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Section: Sediment-focused Environmental Impact Of Rainbow Trout (Oncomentioning

confidence: 99%

Section: Determination Of the Mean Score Of The Sedimentmentioning

confidence: 99%

Section: Determination Of the Mean Score Of The Sedimentmentioning

confidence: 99%

Section: Determination Of the Mean Score Of The Sedimentmentioning

confidence: 99%

Section: Determination Of the Environmental Condition Of The Sedimentmentioning

confidence: 99%

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Untitled

Kaya¹,

Pulatsü²

2017

Turk. J. Fish. Aquat. Sci.

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Fingerprinting source contributions to bed sediment‐associated organic matter in the headwater subcatchments of the River Itchen SAC, Hampshire, UK

Zhang

Collins

McMillan

et al. 2017

River Research & Apps

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Excessive accumulation of sediment-associated organic matter in river beds has detrimental impacts on aquatic ecology, including fish. Sediment and source samples were collected from 3 headwater tributaries of the River Itchen, in southern England. Near infrared spectra and bulk stable carbon and nitrogen isotopes were employed as fingerprint properties to quantify the relative contributions from catchment-based (farmyard manures/slurries, damaged road verges, and septic tanks) and channel-based (decaying instream vegetation, watercress farms, and fish farms) sources. The findings suggested that over the duration of the sampling period, the final estimated median relative contributions in the Candover Stream subcatchment were in the order: farmyard measures/slurries 74% > decaying instream vegetation 15% > watercress farms 6% > septic tanks 3% > damaged road verges 2%. For the River Arle subcatchment, corresponding estimated median relative contributions were in the order: watercress farms 40% > farmyard manures/slurries 28% > decaying instream vegetation 21% > fish farms 7% > damaged road verges and septic tanks 2% each. Similar contributions were estimated for the Tichborne Stream subcatchment: watercress farms 36% > farmyard manures/slurries 26% > decaying instream vegetation 26%and damaged road verges and septic tanks at 6% each. These source apportionment estimates will contribute to stakeholder engagement and targeted management interventions.

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