Browsing NIVA Open Access Archive by Author "Rojas-Tirado, Paula Andrea"
Now showing items 1-6 of 6
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Assessing Stress Resilience After Smolt Transportation by Waterborne Cortisol and Feeding Behavior in a Commercial Atlantic Salmon (Salmo salar) Grow-Out Recirculating Aquaculture System
Höglund, Erik; Fernandes, Paulo; Rojas-Tirado, Paula Andrea; Rundberget, Thomas; Hess-Erga, Ole-Kristian (Peer reviewed; Journal article, 2022)Sampling protocols and water quality sensors have been developed to assess fish health and welfare in recirculating aquaculture systems (RASs). Still, the use of fish-based non-invasive welfare indicators, reflecting the ... -
Hydrogen sulphide dynamics in recirculating aquaculture systems with moving or fixed bed biofilters: A case study in two commercial salmon smolt producing farms in Norway
Fernandes, Paulo; Steigum, Endre; Höglund, Erik; Rojas-Tirado, Paula Andrea; Åtland, Åse (Peer reviewed; Journal article, 2024)Sudden mass mortalities of fish reared in recirculating aquaculture systems (RAS) have occurred in recent years. High total dissolved sulphide (H2S + HS- + S2-) levels in the rearing water have been suggested as an underlaying ... -
Microbial dynamics in RAS water: Effects of adding acetate as a biodegradable carbon-source
Rojas-Tirado, Paula Andrea; Pedersen, Per Bovbjerg; Vadstein, Olav; Pedersen, Lars-Flemming (Journal article; Peer reviewed, 2019)This study evaluated the effect of an abrupt increase in easily biodegradable carbon (acetate) on bacterial activity and abundance in the water of recirculating aquaculture systems (RAS). The study included a batch experiment ... -
Mikrobiota assosiert med atlantisk laks i overgangen fra ferskvann til sjøvann i RAS: effekt av høy/lav partikkelbelasting og konsekvenser for fiskevelferd og -helse (MikroRAS - 901735)
Hess-Erga, Ole-Kristian; Calabrese, Sara; Fernandes, Paulo; Steigum, Endre; Rojas-Tirado, Paula Andrea; Bakke, Ingrid; Fredriksen, Simen; Stenhaug, Stian Ringbakken; Dahle, Håkon; Fiksdal, Ludvik Wolfgang Forbod; Bø, Leif Refsnes; Andrews, Melanie; Roalkvam, Irene; Powell, Mark Darryn (NIVA-rapport;8074-2025, Research report, 2025)Resultatene fra MikroRAS viste flere utfordringer ved forhøyet partikkelbelastning, men også en rekke praktiske fordeler ved lav partikkelbelastning. Forhøyet partikkelnivå, som er vanlig å finne i kommersielle RAS, påvirket ... -
Sulphate removal by membrane filtration minimizes the risk of hydrogen sulphide formation in fixed bed biofilters
Fernandes, Paulo; Rojas-Tirado, Paula Andrea; Åtland, Åse; Åsnes, Helga Øen; Letelier-Gordo, Carlos Octavio; Aalto, Sanni L (Peer reviewed; Journal article, 2024)Hydrogen sulphide (H2S) is one of the suspected reasons behind sudden mass fish mortalities in recirculating aquaculture systems (RAS) in recent years. H2S production in aquaculture systems depends on sulphate and organic ... -
Tilleggsvurderinger omkring planlagt økt utslipp fra Fredrikstad Seafood AS sitt landanlegg på Øra
Golmen, Lars Gunder; Borgersen, Gunhild; Gitmark, Janne Kim; Lindholm, Markus; Rojas-Tirado, Paula Andrea; Staalstrøm, Andre (NIVA-rapport;7325, Research report, 2018)Fredrikstad Seafood AS skal etablere produksjon av smolt og laks opp til slaktestørrelse i et lukka, landbasert RAS-anlegg på Øra i Fredrikstad. Sjøvannsinntaket skal legges ved bunnen av Glomma og utslippet vil gå gjennom ...