Solid and suspended/dissolved waste (N, P, O) from rainbow trout (Oncorynchus mykiss)

Dalsgaard, Johanne; Pedersen, Palle

doi:10.1016/j.aquaculture.2011.01.037

Cited by 82 publications

(72 citation statements)

References 27 publications

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“…4 and 5) respectively (Foy and Rosell, 1991;Roque d'Orbcastel et al, 2008;Mehet and Huseyin, 2014). Chloride can be removed up to 90-95% via aeration and distillation, but the removal of hardness is highly difficult (Sindilariu, 2007;Sindilariu et al, 2009b); thereby the ratio of alkalinity may increase (Dalsgaard and Pedersen, 2011).…”

Section: Resultsmentioning

confidence: 99%

Water Quality Index as a Tool for Assessment of Status of an Urban Lake of Mumbai

Usman¹,

Dube²,

Shukla³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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Section: Resultsmentioning

confidence: 99%

Water Quality Index as a Tool for Assessment of Status of an Urban Lake of Mumbai

Usman¹,

Dube²,

Shukla³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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“…The assumptions for N are fairly robust, whereas the digestibility of P components in salmonids feed is much more uncertain, partly because of the high diversity of molecular P species in the feed (Cho & Bureau 2001, Hua & Bureau 2006. Previous studies that reported the digestibility coefficients for P in rainbow trout have varied in the range of 0.43 to 0.71, depending on the methods used (Vandenberg & De La Noüe 2001, Bureau et al 2003, Azevedo et al 2011, Dalsgaard & Pedersen 2011. We assumed that 50% of the P in the feed is assimilated in salmon (Reid et al 2009), to obtain approximate estimations of the released fractions of DIP and POP+DOP waste.…”

Section: C N and P Release Ratesmentioning

confidence: 99%

“…Handå 2012). It is important to quantify the different nutrient components released by fish farms in order to fully understand the potential of IMTA and the possible effects on the coastal ecosystems, and to optimize the design and nutrient recovery efficiency of IMTA systems (Reid et al 2009, Dalsgaard & Pedersen 2011. The objectives of the present study were to quantify the release rate of inorganic and organic nutrient wastes generated in Norwegian salmon aquaculture, and to make a preliminary evaluation of nutrient loading rates of coastal waters and the theoretical potential of salmon-driven IMTA.…”

Section: Introductionmentioning

confidence: 99%

Discharge of nutrient wastes from salmon farms: environmental effects, and potential for integrated multi-trophic aquaculture

Wang¹,

Olsen²,

Reitan³

et al. 2012

Aquacult. Environ. Interact.

205

144

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We quantified release rates of carbon (C), nitrogen (N) and phosphorus (P) waste from Norwegian salmon farms in 2009 in order to evaluate the theoretical environmental influence on surrounding waters and the potential for integrated multi-trophic aquaculture (IMTA) driven by salmon aquaculture. Of the total feed input, 70% C, 62% N and 70% P were released into the environment, equivalent to an annual discharge of about 404 000, 50 600 and 9400 t of C, N and P, respectively, based on total salmon production of 1.02 × 10 6 t. We predicted that 48% of feed C was respired as CO 2 , 45% of feed N was excreted as dissolved inorganic N (DIN), and 18% of feed P was excreted as dissolved inorganic P (DIP). Approximately 44% of feed P was released as particles, dominating solid wastes. The mean food conversion ratio (feed supplied per fish produced) of Norwegian salmon farms was 1.16 ± 0.08 SE in 2009. Estimates of the potential for IMTA driven by salmon farming showed a far higher potential for seaweed production based on the released DIN than for mussel production based on released appropriately sized particulate organic carbon (POC). The daily volumetric loading rates of DIN from salmon farms (range for counties: 40 to 501 µg N m −3 d −1 ) were <15% of the natural loading rate of nitrate from deep water, suggesting that the nutrient loading rate is within safe limits.KEY WORDS: Cage aquaculture · Atlantic salmon · Nutrient wastes · Feed conversion ratio · FCR · Integrated multi-trophic aquaculture · IMTA · Seaweed · Blue mussels Resale or republication not permitted without written consent of the publisher

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“…Fish with an initial mean weight of 82.2 6 2.4 g were sorted from a larger batch of fish and randomly distributed among 15, 189 l, cylindrical-conical, flow-through, thermoplastic tanks at a stocking density of 20 per fish tank. The tank set-up ensured that all faecal particles were collected in separated sedimentation columns submerged in ice water, as previously described (Dalsgaard and Pedersen, 2011). The tanks were supplied with 108C tap water at a flow rate of 40 l/h.…”

Section: Methodsmentioning

confidence: 99%

Effects of organic plant oils and role of oxidation on nutrient utilization in juvenile rainbow trout (Oncorhynchus mykiss)

Lund

Dalsgaard

Jacobsen

et al. 2013

Animal

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Producing organic fish diets requires that the use of both fishmeal and fish oil (FO) be minimized and replaced by sustainable, organic sources. The purpose of the present study was to replace FO with organic oils and evaluate the effects on feed intake, feed conversion ratio (FCR), daily specific growth rate (SGR) and nutrient digestibility in diets in which fishmeal protein was partly substituted by organic plant protein concentrates. It is prohibited to add antioxidants to organic oils, and therefore the effects of force-oxidizing the oils (including FO) on feed intake and nutrient digestibility was furthermore examined. Four organic oils with either a relatively high or low content of polyunsaturated fatty acids were considered: linseed oil, rapeseed oil, sunflower oil and grapeseed oil. Substituting FO with organic oils did not affect feed intake (P . 0.05), FCR or SGR (P . 0.05) despite very different dietary fatty acid profiles. All organic plant oils had a positive effect on apparent lipid digestibility compared with the FO diet (P , 0.05), whereas there were no effects on the apparent digestibility of other macronutrients when compared with the FO diet (P . 0.05). Organic vegetable oils did not undergo auto-oxidation as opposed to the FO, and the FO diet consequently had a significantly negative effect on the apparent lipid digestibility. Feed intake was not affected by oxidation of any oils. In conclusion, the study demonstrated that it is possible to fully substitute FO with plant-based organic oils without negatively affecting nutrient digestibility and growth performance. Furthermore, plant-based organic oils are less likely to oxidize than FOs, prolonging the shelf life of such organic diets.

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Solid and suspended/dissolved waste (N, P, O) from rainbow trout (Oncorynchus mykiss)

Cited by 82 publications

References 27 publications

Water Quality Index as a Tool for Assessment of Status of an Urban Lake of Mumbai

Water Quality Index as a Tool for Assessment of Status of an Urban Lake of Mumbai

Discharge of nutrient wastes from salmon farms: environmental effects, and potential for integrated multi-trophic aquaculture

Effects of organic plant oils and role of oxidation on nutrient utilization in juvenile rainbow trout (Oncorhynchus mykiss)

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