Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation
Lumpfish is the most important cleanerfish species in Atlantic salmon farming. Detailed information on the gonadal maturation process is a prerequisite for year-round production of juvenile lumpfish. In the present study we have described physiological, morphological and endocrine events associated...
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2022
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Online Access: | https://hdl.handle.net/11250/3057041 https://doi.org/10.1016/j.aquaculture.2022.739162 |
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ftimr:oai:imr.brage.unit.no:11250/3057041 2023-05-15T15:32:35+02:00 Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation Andersson, Eva Denker, Elsa Norberg, Birgitta Schulz, Rüdiger W. Olausson, Sara Thorsen, Anders Stefansson, Sigurd Olav Imsland, Albert 2022 application/pdf https://hdl.handle.net/11250/3057041 https://doi.org/10.1016/j.aquaculture.2022.739162 eng eng Aquaculture. 2022, 566:739162 1-15. urn:issn:0044-8486 https://hdl.handle.net/11250/3057041 https://doi.org/10.1016/j.aquaculture.2022.739162 cristin:2131577 1-15 566:739162 Aquaculture Peer reviewed Journal article 2022 ftimr https://doi.org/10.1016/j.aquaculture.2022.739162 2023-03-15T23:44:41Z Lumpfish is the most important cleanerfish species in Atlantic salmon farming. Detailed information on the gonadal maturation process is a prerequisite for year-round production of juvenile lumpfish. In the present study we have described physiological, morphological and endocrine events associated with the annual reproductive cycle in lumpfish of both sexes. Female lumpfish matured at a body weight close to 2 kg and were capable of spawning two egg batches, one in February/March and one in May/June. Male lumpfish could be stripped for sperm most of the year. The appearance of spawning males with high 11-KT concentrations and clearly developed secondary sexual characters was synchronized with female spawning. From the onset of maturation to the periovulatory stages in females, pituitary transcript levels of gnrhr2ba1 and lhb increased in a correlated manner, together with an increase in GSI and in circulating E2 concentrations. In contrast, a high individual variation of fshb transcript levels was observed, potentially reflecting the bimodal oocyte development with oocytes at different developmental stages present in the ovary at the same time. The onset of pubertal testis growth concurred with an increase in pituitary fshb and lhb transcript levels, while plasma 11-KT concentrations increased at later stages, correlating with a gnrhr2ba1 increase. It appears that spermatogenesis and testis growth is regulated by Fsh and can proceed in the presence of low androgen levels. publishedVersion Article in Journal/Newspaper Atlantic salmon Institute for Marine Research: Brage IMR Aquaculture 566 739162 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
Lumpfish is the most important cleanerfish species in Atlantic salmon farming. Detailed information on the gonadal maturation process is a prerequisite for year-round production of juvenile lumpfish. In the present study we have described physiological, morphological and endocrine events associated with the annual reproductive cycle in lumpfish of both sexes. Female lumpfish matured at a body weight close to 2 kg and were capable of spawning two egg batches, one in February/March and one in May/June. Male lumpfish could be stripped for sperm most of the year. The appearance of spawning males with high 11-KT concentrations and clearly developed secondary sexual characters was synchronized with female spawning. From the onset of maturation to the periovulatory stages in females, pituitary transcript levels of gnrhr2ba1 and lhb increased in a correlated manner, together with an increase in GSI and in circulating E2 concentrations. In contrast, a high individual variation of fshb transcript levels was observed, potentially reflecting the bimodal oocyte development with oocytes at different developmental stages present in the ovary at the same time. The onset of pubertal testis growth concurred with an increase in pituitary fshb and lhb transcript levels, while plasma 11-KT concentrations increased at later stages, correlating with a gnrhr2ba1 increase. It appears that spermatogenesis and testis growth is regulated by Fsh and can proceed in the presence of low androgen levels. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Andersson, Eva Denker, Elsa Norberg, Birgitta Schulz, Rüdiger W. Olausson, Sara Thorsen, Anders Stefansson, Sigurd Olav Imsland, Albert |
spellingShingle |
Andersson, Eva Denker, Elsa Norberg, Birgitta Schulz, Rüdiger W. Olausson, Sara Thorsen, Anders Stefansson, Sigurd Olav Imsland, Albert Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation |
author_facet |
Andersson, Eva Denker, Elsa Norberg, Birgitta Schulz, Rüdiger W. Olausson, Sara Thorsen, Anders Stefansson, Sigurd Olav Imsland, Albert |
author_sort |
Andersson, Eva |
title |
Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation |
title_short |
Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation |
title_full |
Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation |
title_fullStr |
Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation |
title_full_unstemmed |
Lumpfish Cyclopterus lumpus reproduction: Pituitary gene expression, physiological and morphological changes accompanying gonadal maturation |
title_sort |
lumpfish cyclopterus lumpus reproduction: pituitary gene expression, physiological and morphological changes accompanying gonadal maturation |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3057041 https://doi.org/10.1016/j.aquaculture.2022.739162 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
1-15 566:739162 Aquaculture |
op_relation |
Aquaculture. 2022, 566:739162 1-15. urn:issn:0044-8486 https://hdl.handle.net/11250/3057041 https://doi.org/10.1016/j.aquaculture.2022.739162 cristin:2131577 |
op_doi |
https://doi.org/10.1016/j.aquaculture.2022.739162 |
container_title |
Aquaculture |
container_volume |
566 |
container_start_page |
739162 |
_version_ |
1766363075078782976 |