Characterization of smoltification in the Tasmanian strain of Atlantic salmon (Salmo salar) in recirculation and flow-through systems
This study examined morphological, physiological and molecular indicators of smoltification in Atlantic salmon (Salmo salar) juveniles in a flow-through (FT) and recirculating aquaculture system (RAS). Fish were exposed to 24-h light to initiate smoltification, for 5 (FT) and 7 (RAS) weeks prior to...
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ftdeakinunifig:oai:figshare.com:article/20727331 2024-06-23T07:51:20+00:00 Characterization of smoltification in the Tasmanian strain of Atlantic salmon (Salmo salar) in recirculation and flow-through systems CA van Rijn PL Jones BS Evans C Huynh SD McCormick Luis Afonso 2020-02-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30132647 https://figshare.com/articles/journal_contribution/Characterization_of_smoltification_in_the_Tasmanian_strain_of_Atlantic_salmon_Salmo_salar_in_recirculation_and_flow-through_systems/20727331 unknown http://hdl.handle.net/10536/DRO/DU:30132647 https://figshare.com/articles/journal_contribution/Characterization_of_smoltification_in_the_Tasmanian_strain_of_Atlantic_salmon_Salmo_salar_in_recirculation_and_flow-through_systems/20727331 All Rights Reserved Fisheries sciences not elsewhere classified Zoology not elsewhere classified Science & Technology Life Sciences & Biomedicine Fisheries Marine & Freshwater Biology Atlantic salmon Salmo salar Smoltification Osmoregulation Gene expression Aquaculture GILL NA+,K+-ATPASE ACTIVITY PARR-SMOLT TRANSFORMATION GROWTH-HORMONE LEVELS RAINBOW-TROUT NA+/K+-ATPASE FRESH-WATER SEAWATER TEMPERATURE EXPRESSION 3005 Fisheries sciences Text Journal contribution 2020 ftdeakinunifig 2024-06-06T01:53:20Z This study examined morphological, physiological and molecular indicators of smoltification in Atlantic salmon (Salmo salar) juveniles in a flow-through (FT) and recirculating aquaculture system (RAS). Fish were exposed to 24-h light to initiate smoltification, for 5 (FT) and 7 (RAS) weeks prior to transfer from freshwater (FW) to seawater (SW) and were sampled weekly preceding and following SW transfer. Mass, length, condition factor, plasma chloride, gill Na+/K+-ATPase (NKA) activity and expression of salinity-specific isoforms of NKA mRNA transcripts were monitored. Fish raised in FT had significantly lower specific growth rate (SGR) in FW than in SW and showed a significant 5-6-fold increase in gill NKA activity, and high plasma chloride levels after transfer to SW. These fish also exhibited no significant reduction in relative mRNA expression of NKAα1a in FW but a sharp significant downregulation post-SW transfer. No significant increase in NKAα1b was seen until week 8 (3 weeks post-SW transfer). The log2 ratio of NKAα1b to NKAα1a showed a significant 8-fold increase throughout the study. Fish raised in the RAS had significantly higher SGR in FW than SW, and showed significantly higher plasma chloride in saltwater challenged fish compared to the freshwater control at all weeks during the FW phase. Fish had a 50% higher initial NKA activity than in FT, increasing significantly 2-3-fold and showed an immediate down-regulation of NKAα1a after exposure to 24-hr light in FW, and a further reduction after SW-transfer. There was no significant increase in NKAα1b in the RAS-raised fish for the duration of the study, and there was a significant 8-fold increase in log2 ratio of NKAα1b to NKAα1a. Whilst there were too many varying factors to statistically compare hatchery type in this study, it's evident that there are potentially system-related effects worthy of future investigation. Article in Journal/Newspaper Atlantic salmon Salmo salar DRO - Deakin Research Online |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Fisheries sciences not elsewhere classified Zoology not elsewhere classified Science & Technology Life Sciences & Biomedicine Fisheries Marine & Freshwater Biology Atlantic salmon Salmo salar Smoltification Osmoregulation Gene expression Aquaculture GILL NA+,K+-ATPASE ACTIVITY PARR-SMOLT TRANSFORMATION GROWTH-HORMONE LEVELS RAINBOW-TROUT NA+/K+-ATPASE FRESH-WATER SEAWATER TEMPERATURE EXPRESSION 3005 Fisheries sciences |
spellingShingle |
Fisheries sciences not elsewhere classified Zoology not elsewhere classified Science & Technology Life Sciences & Biomedicine Fisheries Marine & Freshwater Biology Atlantic salmon Salmo salar Smoltification Osmoregulation Gene expression Aquaculture GILL NA+,K+-ATPASE ACTIVITY PARR-SMOLT TRANSFORMATION GROWTH-HORMONE LEVELS RAINBOW-TROUT NA+/K+-ATPASE FRESH-WATER SEAWATER TEMPERATURE EXPRESSION 3005 Fisheries sciences CA van Rijn PL Jones BS Evans C Huynh SD McCormick Luis Afonso Characterization of smoltification in the Tasmanian strain of Atlantic salmon (Salmo salar) in recirculation and flow-through systems |
topic_facet |
Fisheries sciences not elsewhere classified Zoology not elsewhere classified Science & Technology Life Sciences & Biomedicine Fisheries Marine & Freshwater Biology Atlantic salmon Salmo salar Smoltification Osmoregulation Gene expression Aquaculture GILL NA+,K+-ATPASE ACTIVITY PARR-SMOLT TRANSFORMATION GROWTH-HORMONE LEVELS RAINBOW-TROUT NA+/K+-ATPASE FRESH-WATER SEAWATER TEMPERATURE EXPRESSION 3005 Fisheries sciences |
description |
This study examined morphological, physiological and molecular indicators of smoltification in Atlantic salmon (Salmo salar) juveniles in a flow-through (FT) and recirculating aquaculture system (RAS). Fish were exposed to 24-h light to initiate smoltification, for 5 (FT) and 7 (RAS) weeks prior to transfer from freshwater (FW) to seawater (SW) and were sampled weekly preceding and following SW transfer. Mass, length, condition factor, plasma chloride, gill Na+/K+-ATPase (NKA) activity and expression of salinity-specific isoforms of NKA mRNA transcripts were monitored. Fish raised in FT had significantly lower specific growth rate (SGR) in FW than in SW and showed a significant 5-6-fold increase in gill NKA activity, and high plasma chloride levels after transfer to SW. These fish also exhibited no significant reduction in relative mRNA expression of NKAα1a in FW but a sharp significant downregulation post-SW transfer. No significant increase in NKAα1b was seen until week 8 (3 weeks post-SW transfer). The log2 ratio of NKAα1b to NKAα1a showed a significant 8-fold increase throughout the study. Fish raised in the RAS had significantly higher SGR in FW than SW, and showed significantly higher plasma chloride in saltwater challenged fish compared to the freshwater control at all weeks during the FW phase. Fish had a 50% higher initial NKA activity than in FT, increasing significantly 2-3-fold and showed an immediate down-regulation of NKAα1a after exposure to 24-hr light in FW, and a further reduction after SW-transfer. There was no significant increase in NKAα1b in the RAS-raised fish for the duration of the study, and there was a significant 8-fold increase in log2 ratio of NKAα1b to NKAα1a. Whilst there were too many varying factors to statistically compare hatchery type in this study, it's evident that there are potentially system-related effects worthy of future investigation. |
format |
Article in Journal/Newspaper |
author |
CA van Rijn PL Jones BS Evans C Huynh SD McCormick Luis Afonso |
author_facet |
CA van Rijn PL Jones BS Evans C Huynh SD McCormick Luis Afonso |
author_sort |
CA van Rijn |
title |
Characterization of smoltification in the Tasmanian strain of Atlantic salmon (Salmo salar) in recirculation and flow-through systems |
title_short |
Characterization of smoltification in the Tasmanian strain of Atlantic salmon (Salmo salar) in recirculation and flow-through systems |
title_full |
Characterization of smoltification in the Tasmanian strain of Atlantic salmon (Salmo salar) in recirculation and flow-through systems |
title_fullStr |
Characterization of smoltification in the Tasmanian strain of Atlantic salmon (Salmo salar) in recirculation and flow-through systems |
title_full_unstemmed |
Characterization of smoltification in the Tasmanian strain of Atlantic salmon (Salmo salar) in recirculation and flow-through systems |
title_sort |
characterization of smoltification in the tasmanian strain of atlantic salmon (salmo salar) in recirculation and flow-through systems |
publishDate |
2020 |
url |
http://hdl.handle.net/10536/DRO/DU:30132647 https://figshare.com/articles/journal_contribution/Characterization_of_smoltification_in_the_Tasmanian_strain_of_Atlantic_salmon_Salmo_salar_in_recirculation_and_flow-through_systems/20727331 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30132647 https://figshare.com/articles/journal_contribution/Characterization_of_smoltification_in_the_Tasmanian_strain_of_Atlantic_salmon_Salmo_salar_in_recirculation_and_flow-through_systems/20727331 |
op_rights |
All Rights Reserved |
_version_ |
1802642387613253632 |