Sublethal Effects of Elevated Nitrate on Atlantic Salmon, Salmo salar
As the end product of nitrification, nitrate (NO3-) can accumulate to alarming concentrations in aquatic ecosystems, especially in areas with extensive farming and aquaculture activity. Nitrate contamination has been overlooked in the past, but recent evidence suggests that elevated NO3- can alter b...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@UMaine
2014
|
Subjects: | |
Online Access: | https://digitalcommons.library.umaine.edu/etd/2173 https://digitalcommons.library.umaine.edu/context/etd/article/3210/viewcontent/FreitagAR2014_OCR.pdf |
id |
ftmaineuniv:oai:digitalcommons.library.umaine.edu:etd-3210 |
---|---|
record_format |
openpolar |
spelling |
ftmaineuniv:oai:digitalcommons.library.umaine.edu:etd-3210 2023-06-11T04:10:16+02:00 Sublethal Effects of Elevated Nitrate on Atlantic Salmon, Salmo salar Freitag, Alyssa Rose 2014-08-01T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/etd/2173 https://digitalcommons.library.umaine.edu/context/etd/article/3210/viewcontent/FreitagAR2014_OCR.pdf unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/etd/2173 https://digitalcommons.library.umaine.edu/context/etd/article/3210/viewcontent/FreitagAR2014_OCR.pdf Electronic Theses and Dissertations Atlantic salmon Development Effect of chemicals on Nitrates Physiological aspects Marine Biology text 2014 ftmaineuniv 2023-05-04T18:02:14Z As the end product of nitrification, nitrate (NO3-) can accumulate to alarming concentrations in aquatic ecosystems, especially in areas with extensive farming and aquaculture activity. Nitrate contamination has been overlooked in the past, but recent evidence suggests that elevated NO3- can alter both reproductive status and thyroid function in a number of animal models. This study examines a variety of physiological and developmental responses to elevated NO3- by Atlantic salmon, Salmo salar L. 1758. Embryos were exposed to 3.76 and 93.15 mg L-1 NO3-N to determine the effects of NO3- on thyroid development. The data revealed no significant differences in number of thyroid follicles, average follicular lumen volume, or total luminal volume, suggesting that elevated NO3- does not impact the morphology of early thyroid tissue in S. salar. In a second experiment, juvenile S. salar were exposed to 5.2, 10.3 and 101.8 mg L-1 NO3-N for 27 days. Chronic exposure to elevated NO3- did not induce significant changes in plasma concentrations of 11-ketotestosterone, total thyroxine or total triiodothyronine, but plasma testosterone displayed a highly significant, non-monotonic dose response to increasing concentrations of NO3-N. Plasma testosterone was elevated at 10.3 mg L-1 NO3-N, which is the maximum allowable contaminant level for NO3-N in drinking water. This data confirms that elevated NO3- can alter hormone production, metabolism and/or clearance, and highlight the importance of NO3- management. These results can be applied to both natural aquatic ecosystems and aquaculture operations, and can be used to create new water quality criteria for the culture of S. salar. Text Atlantic salmon Salmo salar The University of Maine: DigitalCommons@UMaine |
institution |
Open Polar |
collection |
The University of Maine: DigitalCommons@UMaine |
op_collection_id |
ftmaineuniv |
language |
unknown |
topic |
Atlantic salmon Development Effect of chemicals on Nitrates Physiological aspects Marine Biology |
spellingShingle |
Atlantic salmon Development Effect of chemicals on Nitrates Physiological aspects Marine Biology Freitag, Alyssa Rose Sublethal Effects of Elevated Nitrate on Atlantic Salmon, Salmo salar |
topic_facet |
Atlantic salmon Development Effect of chemicals on Nitrates Physiological aspects Marine Biology |
description |
As the end product of nitrification, nitrate (NO3-) can accumulate to alarming concentrations in aquatic ecosystems, especially in areas with extensive farming and aquaculture activity. Nitrate contamination has been overlooked in the past, but recent evidence suggests that elevated NO3- can alter both reproductive status and thyroid function in a number of animal models. This study examines a variety of physiological and developmental responses to elevated NO3- by Atlantic salmon, Salmo salar L. 1758. Embryos were exposed to 3.76 and 93.15 mg L-1 NO3-N to determine the effects of NO3- on thyroid development. The data revealed no significant differences in number of thyroid follicles, average follicular lumen volume, or total luminal volume, suggesting that elevated NO3- does not impact the morphology of early thyroid tissue in S. salar. In a second experiment, juvenile S. salar were exposed to 5.2, 10.3 and 101.8 mg L-1 NO3-N for 27 days. Chronic exposure to elevated NO3- did not induce significant changes in plasma concentrations of 11-ketotestosterone, total thyroxine or total triiodothyronine, but plasma testosterone displayed a highly significant, non-monotonic dose response to increasing concentrations of NO3-N. Plasma testosterone was elevated at 10.3 mg L-1 NO3-N, which is the maximum allowable contaminant level for NO3-N in drinking water. This data confirms that elevated NO3- can alter hormone production, metabolism and/or clearance, and highlight the importance of NO3- management. These results can be applied to both natural aquatic ecosystems and aquaculture operations, and can be used to create new water quality criteria for the culture of S. salar. |
format |
Text |
author |
Freitag, Alyssa Rose |
author_facet |
Freitag, Alyssa Rose |
author_sort |
Freitag, Alyssa Rose |
title |
Sublethal Effects of Elevated Nitrate on Atlantic Salmon, Salmo salar |
title_short |
Sublethal Effects of Elevated Nitrate on Atlantic Salmon, Salmo salar |
title_full |
Sublethal Effects of Elevated Nitrate on Atlantic Salmon, Salmo salar |
title_fullStr |
Sublethal Effects of Elevated Nitrate on Atlantic Salmon, Salmo salar |
title_full_unstemmed |
Sublethal Effects of Elevated Nitrate on Atlantic Salmon, Salmo salar |
title_sort |
sublethal effects of elevated nitrate on atlantic salmon, salmo salar |
publisher |
DigitalCommons@UMaine |
publishDate |
2014 |
url |
https://digitalcommons.library.umaine.edu/etd/2173 https://digitalcommons.library.umaine.edu/context/etd/article/3210/viewcontent/FreitagAR2014_OCR.pdf |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Electronic Theses and Dissertations |
op_relation |
https://digitalcommons.library.umaine.edu/etd/2173 https://digitalcommons.library.umaine.edu/context/etd/article/3210/viewcontent/FreitagAR2014_OCR.pdf |
_version_ |
1768384577148026880 |