CO 2 tolerance of Atlantic salmon post-smolts in recirculating aquaculture systems

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CO 2 tolerance of Atlantic salmon post-smolts in recirculating aquaculture systems Vasco Mota*, Tom Nilsen, Elizabeth Ytteborg, Grete Baeverfjord, Aleksei Krasnov, Jelena Kolarevic, Lars Ebbesson, Steven Summerfelt and Bendik Fyhn Terjesen * Norwegian Institute of Food, Fisheries and Aquaculture Research Nofima vasco.mota@nofima.no

Problem definition Fish exposed to high CO 2 shows: Lower: oxygen consumption, feed intake, growth Higher: Nephrocalcinosis (deposits in kidneys) & cataracts Impaired osmoregulation and blood acidosis Gene expression changes Dissolved CO 2 accumulates in RAS Recommendation for Atlantic salmon: 15 20 mg/l Atlantic salmon CO 2 tolerance in RAS is unknown

OBJECTIVE Carbon dioxide tolerance of Atlantic salmon post-smolts in RAS Foto: Aquafarm Equipment Vasco Mota - Overview of Atlantic salmon RAS and CtrlAQUA developments 21 August 2017 21

Experimental design

Experimental system Water quality Oxygen >85 % Salinity 12 ppt Temperature 12 13 C ph 6.7 7.7 Alkalinity 116 165 mg/l

R: health & welfare No observed effects on: haematocrit glucose hepatosomatic Index eye cataracts welfare score (skin & fins) nephrocalcinosis

Genes RAS 40 FTS 40 RAS 5 FTS 5 40R1>3100.diff_corr 40R2>3101.diff_corr 40R3>3102.diff_corr 40R4>3103.diff_corr 40R5>3104.diff_corr 40R6>3105.diff_corr 40S1>3106.diff_corr 40S2>3107.diff_corr 40S3>3108.diff_corr 40S4>3109.diff_corr 40S5>3110.diff_corr 40S6>3111.diff_corr 5R1>3112.diff_corr 5R2>3113.diff_corr 5R3>3114.diff_corr 5R4>3115.diff_corr 5R5>3116.diff_corr 5R6>3117.diff_corr 5S1>3118.diff_corr 5S2>3119.diff_corr 5S3>3120.diff_corr 5S4>3121.diff_corr 5S5>3122.diff_corr 5S6>3123.diff_corr Tpr protein - Ident 89-1.18-0.73-1.48-0.08-0.16-0.69 1.06 1.39 1.93 0.01 1.33-0.07 1.49 0.24 0.48-0.75 0.83 0.13-1.05-0.07-0.97-1.12-1.50 0.96 Ankycorbin -1.57-1.07-1.69-0.16-0.03-0.74 1.06 1.45 2.43 0.10 1.65-0.06 1.12-0.01 0.65-0.84 1.38 0.42-1.37-0.22-1.12-1.12-1.66 1.39 Dystonin -1.82-1.31-1.85 0.37 0.35-0.50 0.70 0.97 2.08-0.21 1.46 0.39 0.41-0.17 0.89-0.25 1.37 0.62-1.35-0.42-0.87-0.59-1.68 1.40 Tektin-4-1.04-1.09-0.98-0.46 0.09-0.31 0.49 0.87 1.40-0.56 1.76 0.24 0.76-0.35 0.04-0.78 1.70 0.47-0.87-0.36-0.78-1.06-0.64 1.47 Keratin_ type I cytoskeletal 18 - Ident 25-1.05-0.84-1.17-0.57-0.33-0.72 1.31 1.59 1.84-0.45 1.57-0.28 0.80-0.24-0.07-0.79 1.55-0.01-0.96 0.29-0.84-1.08-0.98 1.43 Tubulin--tyrosine ligase-like protein 12-0.84-0.75-1.05-0.36-0.11-0.49 0.78 0.97 1.43-0.25 1.12-0.08 1.50 0.04 0.10-0.77 0.92 0.15-0.77-0.19-0.85-0.95-0.35 0.81 Exosome complex exonuclease RRP4 [Salmo -1.11-0.62 salar] -2.08-0.06-0.25-1.15 1.67 1.92 2.09-0.23 1.32-0.16 2.01 0.47 0.60-1.27 1.04 0.02-0.81 0.50-1.31-1.45-2.10 0.98 Dexamethasone-induced Ras-related protein -0.49-0.51 1 precursor -0.26 [Salmo -0.46-0.12 salar] -0.44-0.25-0.51-0.05-0.41-0.59-0.04 0.37 0.11 0.89 1.00 1.45 1.26-0.11-0.45-0.16-0.23 0.20-0.21 Rho GTPase-activating protein 23-1.19-0.90-1.15-0.03-0.20-0.28 0.14 0.78 1.50-0.14 1.53 0.47 0.44-0.25 0.42-0.69 1.17 0.75-1.17-0.39-0.65-0.76-0.81 1.39 AP-1 complex subunit gamma-like 2 [Salmo -0.55 salar] -0.09-0.02 0.00 0.05-0.49-0.25 0.02 0.31 0.89 0.45 0.59 0.35 0.33 0.95-0.25 0.04 0.43-0.78-0.80-0.49-0.30-0.41 0.02 Diaphanous 2-1.40-1.07-1.49 0.15 0.17-0.36 0.53 0.81 1.96-0.05 1.70 0.26 0.99-0.43 0.37-0.80 1.38 0.50-1.26-0.51-0.82-1.05-0.97 1.39 Telomerase-binding protein EST1A -1.09-0.98-1.37-0.82-0.74-1.00 2.06 2.12 2.75-0.80 2.10-0.77 0.59-0.49-0.47-0.95 2.32-0.46-1.18 0.54-0.97-1.14-1.23 1.96 E3 ubiquitin-protein ligase MARCH4-1.42-0.93-2.24-0.46 0.40-0.34 1.13 1.33 1.73-0.40 1.70 0.53 1.52 0.02 0.37-0.88 1.51 0.73-1.23-0.27-1.48-1.40-1.41 1.51 MHC class I antigen [Salmo salar] 0.32 0.37-0.18-0.67 1.40-0.25 0.18 0.06-0.74 0.44 0.70 0.20 0.55-0.03 1.33-0.09-0.01 0.97-0.28-0.62-1.27-0.53-0.61-1.27 TAP2b [Salmo salar] -0.39-0.10 0.27-0.10-0.17-0.23-0.35-0.27-0.27-0.14-0.42-0.20 0.95 0.76 0.37 0.65 0.46 0.86-0.38-0.49-0.07-0.30-0.16-0.27 CC chemokine with stalk CK2 [Oncorhynchus -0.32-0.52 mykiss] 0.20 0.16-0.06-0.50-0.31 0.40-0.34-0.47-0.73-0.38 0.13 1.22 0.82 0.44 1.36 0.64-0.41 0.28-0.45-0.55-0.25-0.35 C-C motif chemokine 8 precursor [Salmo 0.30 salar] 0.00-0.30-0.71-0.15-0.17 0.12 0.35-0.12-0.71 0.09-0.31-0.01-0.36 1.36 0.89 1.52 1.07 0.25-0.26-0.40-0.36-1.15-0.94 C-X-C chemokine 2 1.32 1.31 0.61 0.40-0.02 0.92-0.48-0.26 0.14 0.83 1.37 0.19-0.89-0.61 0.62-0.80-0.78-0.77 1.08-0.75-0.72-0.73-1.40-0.57 C-X-C chemokine 9 1.33 1.30 0.58 0.45 0.03 0.93-0.45-0.24 0.15 0.85 1.14 0.24-0.76-0.56 0.64-0.89-0.82-0.91 1.09-0.73-0.78-0.75-1.38-0.48 Complement component C7 [Salmo salar] 1.42 1.27 0.73-0.14 0.50-0.27 0.66-0.46 0.49 0.37 0.15 0.62-0.32-0.72 0.09-0.63 0.02-0.92 1.22-0.83-0.86-0.75-1.41-0.21 Complement component C8 gamma chain 1.57precursor -0.65 1.09 [Salmo 0.97 salar] -0.13 1.47-0.46 0.36 0.76-0.22-0.59-0.15-0.15-0.37-0.80 0.18 0.16-0.66-0.51 0.03-0.65-0.22-0.15-0.87 SAPS domain family member 3 [Salmo-1.29 salar] -0.60-2.05 0.06-0.37-0.96 1.24 1.71 2.13 0.12 1.34-0.10 1.57 0.50 0.60-0.84 0.89 0.13-0.95 0.33-1.30-1.20-2.12 1.15 Small inducible cytokine A13 [Oncorhynchus -0.15 mykiss] 0.08 0.51-0.09-0.55-0.36-0.21-1.06-0.14 1.25-0.72-0.36-0.09 0.94 0.25 0.89 1.87 1.06-0.47-0.81-0.72-0.84 0.52-0.80 Small inducible cytokine A13 [Oncorhynchus -0.10 mykiss] 0.14 0.54-0.12-0.58-0.34-0.14-1.10-0.21 1.34-0.57-0.33-0.29 1.17 0.19 0.72 1.98 1.14-0.44-0.88-0.72-0.85 0.44-0.97 putative interferon-alpha/beta receptor 0.12 alpha -0.01 chain -0.32 [Oncorhynchus 0.19-0.61mykiss] 0.14-0.18 0.73 0.58 1.21 0.70 1.00 0.72-0.20-0.34 0.13-0.54-0.41-0.98-0.76-0.98 0.00 0.04-0.24 Complement component 9, Perforin-1-0.08 precursor 0.08 0.11-0.62 0.22 0.16-0.68 0.47-0.35-0.91-0.53-0.92 0.81 1.02 0.71 0.99 1.22-0.01-0.91 0.09-0.29-0.37-0.30 0.07 fish virus induced TRIM protein [Oncorhynchus -1.61-1.05 mykiss] -2.36-0.19 0.20-0.57 1.19 1.47 1.98-0.08 1.85 0.34 1.16 0.05 0.48-1.12 1.66 0.53-1.25 0.09-1.48-1.44-1.56 1.72 Gig2-0.30-0.59-0.67-0.47-0.45-0.48 0.25 0.00 0.19 0.08-0.12 0.12 1.45-0.39 0.59 0.43 0.72 0.51 0.35 0.08 0.12-0.47-0.35-0.61 Gig2-4 -0.55-0.57-0.11-0.55-0.66-0.91 0.85-0.51-0.02 0.45-0.46 1.37 0.88-0.78 0.28 0.54 0.52 0.91 0.15 0.12 0.65-0.15-0.66-0.79 Gig2-7 -0.35-0.83-0.61-0.67-0.58-0.63 0.50-0.09 0.19 0.11-0.20 0.80 1.42-0.61 0.58 0.51 0.79 0.86 0.33 0.01 0.26-0.53-0.44-0.81 ISG15-like -0.81-0.55-1.39 0.41-0.95-0.49 1.85-1.07-0.19 0.03-1.40 3.25 1.07-1.06 0.32 1.55 1.21 1.07-0.21-1.48 0.58 0.49-0.78-1.45 Ubiquitin protein ligase E3A, hect domain -0.32 0.36-0.17-0.54-0.29-0.70 0.46-0.37 0.47 0.25-0.06 1.45 0.53-0.18 0.60 0.35 0.13 1.02-0.14-0.73 0.08-0.53-0.74-0.90 ZNF 1.21 0.48-1.08-0.41-0.81-1.07 0.43-0.31 0.62 0.28-0.15 1.33 0.94-0.29 0.14 0.20 0.67 1.04 0.27-0.80 0.47-1.05-1.09-1.02 C-type lectin domain family 4 member 0.56 E [Salmo -0.89salar] -0.71 1.14-0.85-0.91-0.03 0.64 0.48 0.81-0.17-1.65 0.79 0.52 0.36 0.90 0.54 0.35-0.72-1.74 0.00-0.07-0.45 1.08 C-type lectin M4, cd209l 1.65 0.93 1.08-0.35 0.33 1.25 0.55 0.72 0.75 0.79 0.98-0.09-1.33-0.62 0.50-1.03-1.12-1.07 1.25-1.49-0.38-0.64-2.38-0.27 Fish-egg lectin [Salmo salar] -0.91 0.41-3.36-1.19-1.72-2.99 1.60 1.23 1.56 0.12 1.25 0.74 0.19-0.23 0.43-0.65-1.32 0.60 1.61 0.67 0.62-0.11 0.49 0.96 Rhamnose binding lectin STL2 [Oncorhynchus -0.86-1.44 mykiss] -2.59-0.37-1.13-0.49-0.11-1.50-1.18 2.02 0.82 0.78 1.39-0.68-0.76 0.35 0.86 1.83 0.89-0.98 2.17 0.91-0.26 0.32 Rhamnose-binding lectin precursor [Salmo -0.07 salar] -0.53-2.10-0.30-0.91-0.55 0.18-1.15-1.09 1.09 0.23-0.05 1.85-0.20-0.39 0.11 0.63 1.82 1.25-0.55 1.41 0.34-0.64-0.38 Growth factor independent 1.1-0.70-0.85-1.46-0.65 0.38-0.29 0.60 0.93 1.78-0.67 1.46 0.26 1.06-0.30 0.36-1.13 1.27 0.52-0.45-0.22-0.89-1.44-0.92 1.35 Matrix metalloproteinase-9 1.07-0.31 0.02 0.48-0.21 1.17-0.31-0.38-0.05-0.35 0.28 2.01-1.13-0.68-0.58-1.30-0.95-1.10 1.16 0.13 1.19-0.21-0.68 0.70 modified T cell receptor alpha [Salmo -0.70 salar] -0.59-0.93-0.56-0.06-0.54 0.87 1.17 1.22-0.58 1.22-0.15 1.53 0.04-0.17-0.72 1.19 0.11-0.80-0.02-0.87-0.80-0.93 1.04 TNF receptor member 11B -1.43-0.31-0.32-0.50 0.02-0.14 0.07-0.63-0.26 0.48 0.01-0.21 0.62 0.39 0.72 0.74 0.82 0.32 0.08-0.86 0.39 0.25 0.05-0.29 S100 calcium binding protein A10b -0.05-1.79-1.37-1.32-1.01-0.76 0.43 1.23 0.66 0.96 0.52-0.47-0.58-0.50-0.12-0.60-0.14 0.64 1.24 0.21 1.26 0.43 0.19 0.94 5-aminolevulinate synthase, erythroid-specific, 0.46 0.10mitochondrial -0.07-0.21 precursor 0.60-0.13 [Salmo -0.82 salar] -0.59-0.04 0.24-0.01-1.43-0.08-0.49 0.21 0.04-0.24 0.06 1.32 0.53-0.15 0.24-0.07 0.51 Cytidine deaminase [Salmo salar] 0.21-0.74-0.04 1.05-0.52 0.97 0.03-1.06-0.79 2.22 1.89 1.39-0.09-0.65-1.09-0.89-0.92-0.80 0.35-1.20-0.36-0.21 1.58-0.34 Ectonucleoside triphosphate diphosphohydrolase -1.21-0.59 2-1.02 [Salmo-0.57 salar] -0.38-0.80 1.44 1.79 1.99-0.39 1.79-0.29 0.57-0.28-0.12-0.82 1.65-0.19-1.08 0.21-1.06-1.11-0.93 1.40 Carboxypeptidase A1 precursor [Salmo 0.43 salar] -0.88-1.38-1.10-0.72-0.98-1.36-0.38 0.90 0.05 0.02 0.10 1.30 0.65 1.36 0.57-0.15 1.36-0.24 0.59-0.55-0.42 0.63 0.17 Nucleolar protein 5 [Salmo salar] 0.29-0.28 0.67-0.27 0.70-1.03 0.36-0.41-0.88-1.94 0.01 0.20-0.12 0.13-0.29 0.49 0.26-0.22-0.02 0.62 0.64 0.23 0.79 0.08 Poly polymerase 10 [Salmo salar] 0.42 0.33-0.16 0.55-0.04 0.90 0.22-1.05-1.09-0.27-1.00-1.12 0.23 0.50 0.40 0.08-0.02 0.12-0.29-0.08 0.53 0.54 0.52-0.23 Fatty aldehyde dehydrogenase [Salmo-1.52 salar] -1.17-1.50 0.69-0.15-0.48 0.06 0.70 2.65 0.48 1.39 0.29 1.01-0.19 1.28-0.80 0.91 0.46-1.32-1.58-0.48-0.57-1.50 1.35 Sulfotransferase family cytosolic 2B member -0.29 1.74 [Salmo -0.31 salar] -0.51-0.47-0.44-0.67-0.54-0.76-0.74-0.65-0.62-0.46-0.17 1.55 1.65-0.43-0.46 1.24-0.45 1.46 1.34-0.59-0.44 Claudin-like protein ZF4A22 [Salmo salar] -1.09-0.74-2.01-0.57 0.06-0.72 1.51 1.75 1.76-0.66 1.56 0.07 1.96 0.37 0.05-1.22 1.30 0.34-0.86 0.44-1.46-1.61-1.46 1.25 Fibulin-1 [Salmo salar] 0.88 0.13 0.66 0.34 0.02 0.96-0.08 0.30 0.40 0.13 0.02-0.18-0.80-0.71-0.63-0.44-0.19-0.26-0.10 0.24-0.12-0.06-0.22-0.27 Nephronectin variant 2 - Ident 84-1.82-0.76-2.01-0.51-0.45-1.23 1.91 2.20 2.07-0.66 1.96 0.32 1.26 0.30-0.16-1.12 1.92 0.37-0.93 0.40-1.66-1.38-1.70 1.68 Otoancorin -0.52-0.54-0.65-0.51-0.77-0.75 0.22 0.29 0.50 0.23 0.26-0.08 0.48-0.34 0.24 0.44 0.38 0.38 0.45 0.12 0.39 0.09-0.30 0.00 Glucocorticoid receptor -1.18-0.70-2.04-0.13-0.21-1.04 1.53 1.71 2.14-0.11 1.40-0.30 1.92 0.41 0.68-0.88 1.00 0.02-0.86 0.27-1.30-1.37-1.96 1.02 Inactive serine protease PAMR1-1.58-0.85-1.78 0.03-0.02-0.61 0.74 1.01 1.99 0.08 1.48 0.11 0.98 0.14 0.77-0.51 1.02 0.48-1.44-0.05-0.93-0.83-1.49 1.27 Solute carrier family 13 member 3, slsc13a -0.55-0.53-0.67-0.35-0.25-0.37 0.17 1.71 0.83-0.41 0.78 0.52 0.31-0.07-0.20-0.34 0.83-0.06-0.57-0.12-0.47-0.45-0.51 0.80 Tripartite motif-containing protein 55-1.60 [Salmo-1.56 salar] -1.93-0.05 0.33-0.30 0.71 0.61 2.57-0.34 1.88 0.46 1.04-1.21 0.82-0.68 1.71 0.49-1.25-0.39-0.63-1.32-0.96 1.59 homeobox protein HoxC8ba [Salmo salar] -1.45-0.99-1.66 0.32 0.05-0.63 0.75 0.96 2.15-0.03 1.59 0.09 1.28-0.12 0.56-0.64 1.17 0.36-1.23-0.32-1.00-0.99-1.49 1.26 Lim homeobox protein 3 [Salmo salar]-0.79-0.58-1.08-0.38-0.44-0.87 1.18 1.64 1.48-0.31 0.92-0.34 2.33 0.41-0.05-1.02 0.68-0.27-0.68 0.23-0.81-0.99-0.96 0.71 Extracellular matrix protein 1 precursor -1.02 [Salmo -1.33 salar] 0.20-1.09-1.70-0.72-0.03 0.10 1.38-1.09-0.22 0.62 0.41 0.25 0.41 1.89 0.68 1.85-1.45 1.24-0.41-0.29-0.30 0.62 leukolectin protein [Salmo salar] -0.62 0.39-3.07-1.34-1.79-2.98 1.75 1.27 1.52 0.06 1.04 0.45 0.18-0.12 0.50-0.98-1.30 0.46 1.83 0.61 0.96-0.13 0.36 0.92 leukolectin protein [Salmo salar] -0.89 0.47-3.38-1.20-1.72-3.23 1.73 1.25 1.67 0.04 1.14 0.61 0.27-0.26 0.53-0.90-1.39 0.48 1.69 0.83 0.85-0.15 0.53 1.02 Up-regulator of cell proliferation -0.07 0.47-0.39-0.46-0.55-0.75 0.00-0.15-0.45-0.21-0.36 0.61 1.43 0.72 0.77-0.27 1.04 0.13-0.75-1.11 0.26 0.23-0.38 0.22 Col6a2 protein - Ident 96 1.21 0.66-0.05 0.02-0.30 1.49-0.58-0.26 1.25 1.09 0.91-0.08 0.32 0.04 0.14-0.87-0.26-0.42 0.41-1.57-0.93-1.20-0.88-0.15 GMP Giant mucus protein -0.51 0.34-0.39-0.13 0.23-0.55 0.59 0.65 1.38 0.24 1.28 0.39 0.28-0.27 0.40-0.87 0.89-0.18-0.18-0.45-1.63-0.99-1.28 0.76 Calcitonin-1 precursor [Salmo salar] 0.09 1.12 0.51 0.60 0.69-0.22 0.23-0.65 0.21 0.47 0.47-0.21-0.23-0.56-0.16-0.65-1.27-0.33 0.41 0.13-0.24-0.31 0.14-0.22 growth hormone receptor isoform 1 precursor 0.16 0.91 [Salmo -0.07 salar] -0.34-0.17-0.08 0.50-0.15 0.29 0.85 1.04 0.54-1.16-0.72-0.38-0.38-1.05-0.71 0.69 0.41-0.25-0.12 0.27-0.07 Angiogenin-1 precursor / RNase ZF3 1.84-3.35-1.38-2.46-3.38-4.17-0.23 0.72 6.10-1.03-0.27-2.95 1.39-1.04 1.33 0.04 2.36 3.06 3.55-4.06 1.98-1.41-0.55 3.95 G-protein coupled receptor 183-0.76-0.61-0.76-0.19-0.02-0.28 0.41 0.82 1.21-0.43 1.27 0.14 0.58-0.25-0.06-0.64 1.10 0.21-0.70-0.27-0.56-0.83-0.49 1.10 UDP-GlcNAc:betaGal beta-1_3-n-acetylglucosaminyltransferase-like -1.09-0.60-1.96-0.25-0.351 --0.87 Ident 991.36 1.74 1.90-0.15 1.30-0.15 1.90 0.56 0.41-0.90 0.94 0.15-0.99 0.43-1.27-1.37-1.70 0.96 Optineurin [Salmo salar] -1.58-1.07-1.57 0.28-0.09-0.69 0.93 1.06 2.58 0.08 1.55-0.23 0.76-0.11 1.13-0.15 1.16 0.44-1.46-0.68-0.81-0.92-1.88 1.24 Synaptobrevin homolog ykt6 [Oncorhynchus -1.19-0.88 mykiss] -1.31 0.27-0.21-0.63 0.65 0.97 1.91 0.25 1.20-0.30 1.15-0.08 0.41-0.45 0.83 0.23-1.12-0.19-0.69-0.78-1.12 1.07 Synaptosomal-associated protein 25-A -1.81 [Salmo -1.04 salar] -2.01 0.45 0.12-0.61 0.38 1.10 2.15 0.56 1.63 0.28 0.76-0.09 0.73-0.74 1.42 0.53-1.49-0.15-1.09-0.74-1.75 1.43 Zymogen granule membrane protein -0.16 precursor 0.06 [Salmo -1.67 salar] 0.62-0.79-1.12-0.74-3.03-1.70 0.38 1.00 0.50 2.83 0.67 0.90 0.34 2.07 1.21 1.75-3.24 2.14-1.04-1.06 0.09 Zymogen granule membrane protein 16-0.70 precursor -1.52 [Salmo -0.17 salar] 0.79-0.74-1.64-0.06-2.77-1.94 0.49 0.17 0.74 2.86 2.13 1.75 1.00 1.88 0.65 1.39-1.59 1.18-0.14-3.28-0.49 Ceacam1-0.16-0.63-0.39-0.45-0.40 0.01-0.55-0.31-0.29-0.29 0.08 0.09 0.57 0.80 0.45 0.77 1.22 0.49-0.22-0.55 0.43-0.16-0.39-0.13 EGF-like domain-containing protein 7 precursor -1.64-0.75[Salmo -2.49salar] -0.39-0.25-1.04 1.99 2.22 2.19-0.33 1.93-0.03 1.25 0.29 0.30-1.16 1.86 0.15-1.17 0.67-1.77-1.58-2.02 1.77 Fibronectin 1b - Ident 28-0.21 0.58-0.27-0.80-0.27-0.58 0.01-0.09-0.40-0.31-0.12 0.64 1.34 0.65 0.68-0.18 0.85 0.10-0.62-1.05-0.14 0.18-0.34 0.35 Leucine rich repeat containing 8 family_ -0.08 member -0.25 C -0.38 0.08-0.22 0.12 0.52-0.20 0.42 1.60 0.54 0.45-1.19-0.53-1.27-0.90-1.08-0.61 0.29 0.35 0.73 0.41 1.02 0.18 Tetraspanin-1 [Salmo salar] -0.54-0.94-0.49-0.50-0.47-0.53-0.08-0.01-0.06 0.28 0.08-0.03 0.12 0.52-0.62 0.92 0.07 0.72 0.51-0.33 0.32 0.84 0.23 0.02 Uncharacterized protein -0.53-0.51 0.46-0.64 0.35-0.56 0.39-0.61-0.32-0.67-0.63-0.61-0.59 0.94 0.91 1.12 0.69 0.70 0.60 0.99 0.26-0.59-0.56-0.55 Uncharacterized protein 0.02-0.61 0.08-0.34-0.53-0.27 0.06-0.28-0.19-0.23-0.14 0.00 1.23 0.45 0.03-0.02 1.15 0.25-0.57-0.68 0.39 0.11-0.08 0.19 Uncharacterized protein -0.20 0.72-0.32-0.77-0.51-0.63-0.06 0.04-0.38-0.07-0.23 0.67 1.28 0.64 0.94-0.21 0.61 0.05-0.54-1.00-0.13 0.42-0.47 0.13 Unknown 0.23 0.68 0.09-1.11 1.34-1.32 0.06-0.88-1.11-1.29-0.98-0.04 0.92-1.25 0.91 0.79 0.22 0.32 0.96 0.24 0.82 0.78 1.01-1.41 Ankyrin repeat and SAM domain-containing -0.80 protein -0.50-1.41 6-0.32-0.37-0.82 1.35 1.62 1.64-0.40 0.93-0.48 2.31 0.49 0.08-0.89 0.59-0.07-0.67 0.34-1.02-1.04-1.24 0.67 Immunoglobulin superfamily member -0.55 8-0.80-0.26-0.46 0.62-0.32-0.51-0.55-0.36-0.14-0.32-0.25-0.83-0.62 0.46 0.80 0.64-0.50 0.63 0.81 0.99 0.83-0.11 0.82 R: gene expression microarray Gill: low DEG / gene suppression in RAS

R: physiology Negative correlation choride vs. bicarbonate Positive regression CO 2 plasma vs. water

R: fish growth

R: fish body weight

R: fish body weight

Conclusions no mortalities, cataracts, nephrocalcinosis or poor external welfare observed in fish exposed to CO 2 from 5 40 mg/l the highest non-observed effect concentration for several ions and growth was 5 mg/l Three take home messages Atlantic salmon very resilient to high CO 2 CO 2 has a growth penalty, and this penalty starts at lower concentrations than previously reported (<12 mg/l) early production conditions have a carry-over effect on fish performance at later phases

Special thanks to Michele Gallo, Jascha Gerwins, and all user partners, researchers, and technicians who have contributed. Thank you for your attention. Vasco Mota Contact: vasco.mota@nofima.no