Iodine nutrition and toxicity in Atlantic cod (Gadus morhua) larvae
Copepods as feed promote better growth and development in marine fish larvae than rotifers. However, unlike rotifers, copepods contain several minerals such as iodine (I), at potentially toxic levels. Iodine is an essential trace element and both under and over supply of I can inhibit the production...
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ftunivbergen:oai:bora.uib.no:1956/12382 2023-05-15T15:27:28+02:00 Iodine nutrition and toxicity in Atlantic cod (Gadus morhua) larvae Penglase, Samuel Harboe, Torstein Sæle, Øystein Helland, Synnøve Nordgreen, Andreas Hoel Hamre, Kristin 2016-04-11T12:46:30Z application/pdf http://hdl.handle.net/1956/12382 https://doi.org/10.7717/peerj.20 eng eng PeerJ Norges forskningsråd: 199482 EU: LARVANET – COST action FA0801 Norges forskningsråd: 185006 urn:issn:2167-8359 http://hdl.handle.net/1956/12382 https://doi.org/10.7717/peerj.20 cristin:1051429 Attribution CC BY http://creativecommons.org/licenses/by/3.0/ Copyright 2013 The Authors Fish larvae Cod larvae Rotifers Iodine requirement Iodine toxicity Thyroid hormones Thyroid follicles Mineral interactions Colloid goitre VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 Peer reviewed Journal article 2016 ftunivbergen https://doi.org/10.7717/peerj.20 2023-03-14T17:40:28Z Copepods as feed promote better growth and development in marine fish larvae than rotifers. However, unlike rotifers, copepods contain several minerals such as iodine (I), at potentially toxic levels. Iodine is an essential trace element and both under and over supply of I can inhibit the production of the I containing thyroid hormones. It is unknown whether marine fish larvae require copepod levels of I or if mechanisms are present that prevent I toxicity. In this study, larval Atlantic cod (Gadus morhua) were fed rotifers enriched to intermediate (26 mg I kg-1 dry weight; MI group) or copepod (129 mg I kg-1 DW; HI group) I levels and compared to cod larvae fed control rotifers (0.6 mg I kg-1 DW). Larval I concentrations were increased by 3 (MI) and 7 (HI) fold compared to controls during the rotifer feeding period. No differences in growth were observed, but the HI diet increased thyroid follicle colloid to epithelium ratios, and affected the essential element concentrations of larvae compared to the other groups. The thyroid follicle morphology in the HI larvae is typical of colloid goitre, a condition resulting from excessive I intake, even though whole body I levels were below those found previously in copepod fed cod larvae. This is the first observation of dietary induced I toxicity in fish, and suggests I toxicity may be determined to a greater extent by bioavailability and nutrient interactions than by total body I concentrations in fish larvae. Rotifers with 0.6 mg I kg-1 DW appeared sufficient to prevent gross signs of I deficiency in cod larvae reared with continuous water exchange, while modelling of cod larvae versus rotifer I levels suggests that optimum I levels in rotifers for cod larvae is 3.5 mg I kg-1 DW. publishedVersion Article in Journal/Newspaper atlantic cod Gadus morhua Copepods Rotifer University of Bergen: Bergen Open Research Archive (BORA-UiB) PeerJ 1 e20 |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
topic |
Fish larvae Cod larvae Rotifers Iodine requirement Iodine toxicity Thyroid hormones Thyroid follicles Mineral interactions Colloid goitre VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 |
spellingShingle |
Fish larvae Cod larvae Rotifers Iodine requirement Iodine toxicity Thyroid hormones Thyroid follicles Mineral interactions Colloid goitre VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 Penglase, Samuel Harboe, Torstein Sæle, Øystein Helland, Synnøve Nordgreen, Andreas Hoel Hamre, Kristin Iodine nutrition and toxicity in Atlantic cod (Gadus morhua) larvae |
topic_facet |
Fish larvae Cod larvae Rotifers Iodine requirement Iodine toxicity Thyroid hormones Thyroid follicles Mineral interactions Colloid goitre VDP::Landbruks- og fiskerifag: 900::Fiskerifag: 920::Fiskehelse : 923 VDP::Agriculture and fisheries science: 900::Fisheries science: 920::Fish health: 923 |
description |
Copepods as feed promote better growth and development in marine fish larvae than rotifers. However, unlike rotifers, copepods contain several minerals such as iodine (I), at potentially toxic levels. Iodine is an essential trace element and both under and over supply of I can inhibit the production of the I containing thyroid hormones. It is unknown whether marine fish larvae require copepod levels of I or if mechanisms are present that prevent I toxicity. In this study, larval Atlantic cod (Gadus morhua) were fed rotifers enriched to intermediate (26 mg I kg-1 dry weight; MI group) or copepod (129 mg I kg-1 DW; HI group) I levels and compared to cod larvae fed control rotifers (0.6 mg I kg-1 DW). Larval I concentrations were increased by 3 (MI) and 7 (HI) fold compared to controls during the rotifer feeding period. No differences in growth were observed, but the HI diet increased thyroid follicle colloid to epithelium ratios, and affected the essential element concentrations of larvae compared to the other groups. The thyroid follicle morphology in the HI larvae is typical of colloid goitre, a condition resulting from excessive I intake, even though whole body I levels were below those found previously in copepod fed cod larvae. This is the first observation of dietary induced I toxicity in fish, and suggests I toxicity may be determined to a greater extent by bioavailability and nutrient interactions than by total body I concentrations in fish larvae. Rotifers with 0.6 mg I kg-1 DW appeared sufficient to prevent gross signs of I deficiency in cod larvae reared with continuous water exchange, while modelling of cod larvae versus rotifer I levels suggests that optimum I levels in rotifers for cod larvae is 3.5 mg I kg-1 DW. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Penglase, Samuel Harboe, Torstein Sæle, Øystein Helland, Synnøve Nordgreen, Andreas Hoel Hamre, Kristin |
author_facet |
Penglase, Samuel Harboe, Torstein Sæle, Øystein Helland, Synnøve Nordgreen, Andreas Hoel Hamre, Kristin |
author_sort |
Penglase, Samuel |
title |
Iodine nutrition and toxicity in Atlantic cod (Gadus morhua) larvae |
title_short |
Iodine nutrition and toxicity in Atlantic cod (Gadus morhua) larvae |
title_full |
Iodine nutrition and toxicity in Atlantic cod (Gadus morhua) larvae |
title_fullStr |
Iodine nutrition and toxicity in Atlantic cod (Gadus morhua) larvae |
title_full_unstemmed |
Iodine nutrition and toxicity in Atlantic cod (Gadus morhua) larvae |
title_sort |
iodine nutrition and toxicity in atlantic cod (gadus morhua) larvae |
publisher |
PeerJ |
publishDate |
2016 |
url |
http://hdl.handle.net/1956/12382 https://doi.org/10.7717/peerj.20 |
genre |
atlantic cod Gadus morhua Copepods Rotifer |
genre_facet |
atlantic cod Gadus morhua Copepods Rotifer |
op_relation |
Norges forskningsråd: 199482 EU: LARVANET – COST action FA0801 Norges forskningsråd: 185006 urn:issn:2167-8359 http://hdl.handle.net/1956/12382 https://doi.org/10.7717/peerj.20 cristin:1051429 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/3.0/ Copyright 2013 The Authors |
op_doi |
https://doi.org/10.7717/peerj.20 |
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1 |
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1766357905432379392 |