Effects of feed loading on nitrogen balances and fish performance in replicated recirculating aquaculture systems

Pedersen, Lars‐Flemming; Suhr, Karin Isabel; Dalsgaard, Johanne; Pedersen, Palle; Arvin, Erik

doi:10.1016/j.aquaculture.2012.01.035

Cited by 57 publications

(38 citation statements)

References 28 publications

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“…This may be attributed to higher feed intake (fish were fed to satiation) of rainbow trout along with the high FCR. The FCR values were similar or superior to those previously reported for the tested species (Bailey and Alanara 2006;Fischer et al 2009;Pedersen et al 2012), possibly due to manual feeding at frequent intervals, strictly controlled amount of uneaten feed, and use of high quality feed. Generally, the ability to utilize higher amounts of feed per day produces more rapid growth of fish stock.…”

Section: Discussionsupporting

confidence: 63%

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Feasibility of rearing brook char fingerlings in an intensive recirculating hatchery as a complementary species to rainbow trout

Buřič¹,

Bláhovec²,

Kouřil³

2016

CZECH J ANIM SCI

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Aquaculture, as the fastest growing agriculture sector, is currently focused on exploring the development of effective intensive recirculating systems (RAS). The use of intensive RAS requires a stable supply of fingerlings throughout the year. Salmonids are a highly important aquaculture species, with rainbow trout Oncorhynchus mykiss often reared in freshwater RASs. The dominant position of rainbow trout has triggered the investigation of a wider diversification of species, including brook char Salvelinus fontinalis. Brook char has the potential to be reared in facilities similar to those used for rainbow trout, but it is not known if brook char is suitable for hatching in an intensive recirculating hatchery system (RHS) to provide a consistent supply of fingerlings to an associated RAS roughly every three months. The present study evaluated the feasibility of producing brook char fingerlings in an RHS and compared results to those obtained with rainbow trout. A production cycle from eyed egg to fingerling was completed separately for rainbow trout, brook char, and parallel rearing of both species for the comparison of growth rate, feed conversion ratio, and the time to reach individual fingerling weight of 2 g. The results showed slower growth rate of brook char compared to rainbow trout reared under the same conditions and a significantly longer production cycle (~108 days), compared to rainbow trout (~74 days). Results suggest that brook char is not suitable for parallel rearing in facilities with primary rainbow trout production. The main practical problem is disruption of the production cycle which requires fingerling stocking at 3-month intervals.

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Section: Discussionsupporting

confidence: 63%

“…Growth rate, expressed as SGR, for both brook char and rainbow trout reached higher levels than has been reported for rainbow trout in previous studies (Pedersen et al 2012;Unger and Brinker 2013). Rainbow trout showed significantly higher mean SGR than brook char, while FCR values were similar for both species.…”

Section: Discussioncontrasting

confidence: 37%

Feasibility of rearing brook char fingerlings in an intensive recirculating hatchery as a complementary species to rainbow trout

Buřič¹,

Bláhovec²,

Kouřil³

2016

CZECH J ANIM SCI

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“…Each system was also equipped with a swirl separator, a pump sump, and a trickling filter as described by Pedersen et al (2012). The utilization of the swirl separator promoted equal settling of large solids in each system, and minimized potential limitations and problems due to solids accumulation in the control group.…”

Section: Methodsmentioning

confidence: 99%

“…Water exchange was conducted as described in Pedersen et al (2012). A fixed volume of 80L, or 4.7% of total system volume, was replaced every day, representing a hydraulic retention time of 21days in the system.…”

Section: Operating Conditions and Daily Monitoringmentioning

confidence: 99%

Microscreen effects on water quality in replicated recirculating aquaculture systems

Fernandes

Pedersen

2015

Aquacultural Engineering

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“…In aquaculture production, relative water consumption is defined as the volume of water taken related to the production of biomass or feed used, so that the feedstock, expressed as kg of feed per m 3 of water, reflects the intensity of recirculation and affects waste accumulation in untreated systems (8) and is directly related to the biofilter's ability to nitrify (9).…”

Section: Introductionmentioning

confidence: 99%

Performance of different biofilters in a recirculating system for rainbow trout farming

et al. 2016

Rev MVZ Córdoba

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Objective. To evaluate the performance of different biofilters in a recirculating aquaculture system (RAS) for trout farming. Materials and methods. It was used a 1m3 plastic tank for fries farming; fabric bags to solids retention; a submersible pump; a constant water level and flow distribution box; six up flow biofilters in 3” PVC tube; sand of D10=0.45mm as carrier. The reactors were operated at local temperature and with hydraulic retention time (HRT) of 11 min, the biofilters were inoculated in the next way: R1-Control: RAS water; R2-Fish culture farm sludges; R3- Water from aerated lagoon of Antanas landfill (AL); R4-Aquarium sediments; R5- Aerated lagoon of AL sludges; R6-Sludges from sulfidogenic reactor of AL. The weight gain (WG) and the food conversion (FC) were evaluated, some physic-chemical parameters were monitored and the nitrogen and suspended solids removal efficiency were evaluated. Results. The WG of the cultured animals was 1.58 g/d and the FC was 1.41. There were no differences for ammonium and nitrite removal between the reactors; the average removal efficiencies were: ammonium 4.78%, nitrite 27.2%, nitrate 32.3%, suspended solids 37.5%; R4 and R5 reactors presented the best performance on nitrate removal, with average efficiencies of 47.4% and 42.8%. R3 presented the best SS removal with an average of 58.2%. Conclusions. The RAS water treatment system guaranteed appropriated liquid quality conditions for trout farming; the most efficient reactor for removal of the different forms of nitrogen was the inoculated with the aerated lagoon of AL sludges.RESUMEN Objetivo. Evaluar el desempeño de diferentes biofiltros en un sistema de recirculación (SRA) para cultivo de trucha arcoiris. Materiales y métodos. Se utilizó: un tanque de 1m3 para cultivo de alevines, bolsas de lienzo para retención de sólidos, bomba sumergible, caja de nivel constante y distribución de flujo, seis biofiltros en tubo de PVC de 3”, arena con D10=0.45mm como medio soporte. Los biofiltros se operaron a temperatura ambiente y con tiempo de retención hidráulica (TRH) de 11 min, se inocularon así: R1-Control: Aguas del SRA; R2-Lodos estación piscícola; R3-Agua Laguna aireada relleno sanitario Antanas (RSA); R4-Sedimentos acuarios; R5-Lodos laguna aireada RSA; R6-Lodos reactor sulfidogénico RSA. Se evaluó la ganancia de peso (GP) y la conversión alimenticia (CA), se monitorearon parámetros físico-químicos y se evaluó la eficiencia de remoción de nitrógeno y sólidos suspendidos. Resultados. La GP de los animales fue de 1.58 g/d y la CA de 1.41. No hubo diferencias para remoción de amonio ni nitritos entre reactores; las eficiencias medias de remoción fueron: amonio 4.78%, nitrito 27.2%, nitrato 32.3%, sólidos suspendidos 37.5%. Los reactores R4 y R5 presentaron mejor remoción de nitratos, con eficiencias medias de 47.4% y 42.8%. El R3 reportó la mejor remoción de SS con promedio del 58.2%. Conclusiones. El sistema de tratamiento del agua en el SRA garantizó condiciones de calidad del líquido, apropiadas para el cultivo de la trucha; el reactor más eficiente para la remoción de las formas de nitrógeno evaluadas fue el inoculado con lodos de la laguna aireada del RSA.

show abstract

Effects of feed loading on nitrogen balances and fish performance in replicated recirculating aquaculture systems

Cited by 57 publications

References 28 publications

Feasibility of rearing brook char fingerlings in an intensive recirculating hatchery as a complementary species to rainbow trout

Feasibility of rearing brook char fingerlings in an intensive recirculating hatchery as a complementary species to rainbow trout

Microscreen effects on water quality in replicated recirculating aquaculture systems

Performance of different biofilters in a recirculating system for rainbow trout farming

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