Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: Possible involvement of chemical communication
10 pages, 8 figures This study was aimed to investigate whether sexual maturation of immature male eels could be stimulated indirectly by placing them in contact with either male (Minj) or female (Finj) eels in which sexual maturation had been stimulated directly by weekly injections of human chorio...
Published in: | General and Comparative Endocrinology |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2006
|
Subjects: | |
Online Access: | http://hdl.handle.net/10261/20686 https://doi.org/10.1016/j.ygcen.2006.01.017 |
id |
ftcsic:oai:digital.csic.es:10261/20686 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/20686 2024-02-11T09:55:36+01:00 Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: Possible involvement of chemical communication Huertas, Mar Scott, Alexander P. Hubbard, Peter C. Canario, Adelino V. M. Cerdà, Joan 2006-07 22195 bytes application/pdf http://hdl.handle.net/10261/20686 https://doi.org/10.1016/j.ygcen.2006.01.017 en eng Elsevier https://doi.org/10.1016/j.ygcen.2006.01.017 General and Comparative Endocrinology 147(3): 304–313 (2006) 0016-6480 http://hdl.handle.net/10261/20686 doi:10.1016/j.ygcen.2006.01.017 none Eel Ovulation Spermatogenesis Plasma steroids Steroid release Olfaction Pheromone artículo http://purl.org/coar/resource_type/c_6501 2006 ftcsic https://doi.org/10.1016/j.ygcen.2006.01.017 2024-01-16T09:25:19Z 10 pages, 8 figures This study was aimed to investigate whether sexual maturation of immature male eels could be stimulated indirectly by placing them in contact with either male (Minj) or female (Finj) eels in which sexual maturation had been stimulated directly by weekly injections of human chorionic gonadotropin (hCG) or salmon pituitary extract (SPE), respectively. Untreated males were placed either in the same tank or in a separate tank that was linked to the injected fish via a recirculation system. The hormonal treatments stimulated spermatogenesis and spermiation in Minj, and ovulation in Finj as well as an increase of the ocular (Io) and gonadosomatic (GSI) indices in both sexes. Plasma levels of testosterone (T) and 11-ketotestosterone (11-KT) increased in Minj and T and 17β estradiol (E2) in Finj. A small peak of plasma 17,20β-dihydroxypregn-4-en-3-one (17,20βP) occurred during ovulation, while the plasma levels of 17α-hydroxypregn-4-ene-3,20-dione (17P) were undetectable in both males and females. The water conditioned by Minj and Finj induced significant, though relatively minor, increases in Io and GSI in uninjected males. In addition, uninjected fish showed small changes in plasma T and 11-KT levels, apparently related to the timing of spermiation and ovulation of Minj and Finj, respectively, as well as an activation of spermatogenesis (but not spermiation). Injected fish released free and conjugated T, 11-KT and E2 into the water, although immature eels were unable to smell (by electro-olfactogram) any of these steroids or prostaglandin F2 . However, immature males were highly sensitive to water extracts conditioned by spermiating Minj and pre-ovulatory and ovulated Finj. These preliminary results suggest the existence of chemical communication between maturing eels and immature males that stimulates gonad development, although the putative pheromone(s) involved has/have not yet been identified. This work was supported by grants from the Reference Center in Aquaculture (Generalitat de ... Article in Journal/Newspaper Anguilla anguilla Digital.CSIC (Spanish National Research Council) General and Comparative Endocrinology 147 3 304 313 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Eel Ovulation Spermatogenesis Plasma steroids Steroid release Olfaction Pheromone |
spellingShingle |
Eel Ovulation Spermatogenesis Plasma steroids Steroid release Olfaction Pheromone Huertas, Mar Scott, Alexander P. Hubbard, Peter C. Canario, Adelino V. M. Cerdà, Joan Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: Possible involvement of chemical communication |
topic_facet |
Eel Ovulation Spermatogenesis Plasma steroids Steroid release Olfaction Pheromone |
description |
10 pages, 8 figures This study was aimed to investigate whether sexual maturation of immature male eels could be stimulated indirectly by placing them in contact with either male (Minj) or female (Finj) eels in which sexual maturation had been stimulated directly by weekly injections of human chorionic gonadotropin (hCG) or salmon pituitary extract (SPE), respectively. Untreated males were placed either in the same tank or in a separate tank that was linked to the injected fish via a recirculation system. The hormonal treatments stimulated spermatogenesis and spermiation in Minj, and ovulation in Finj as well as an increase of the ocular (Io) and gonadosomatic (GSI) indices in both sexes. Plasma levels of testosterone (T) and 11-ketotestosterone (11-KT) increased in Minj and T and 17β estradiol (E2) in Finj. A small peak of plasma 17,20β-dihydroxypregn-4-en-3-one (17,20βP) occurred during ovulation, while the plasma levels of 17α-hydroxypregn-4-ene-3,20-dione (17P) were undetectable in both males and females. The water conditioned by Minj and Finj induced significant, though relatively minor, increases in Io and GSI in uninjected males. In addition, uninjected fish showed small changes in plasma T and 11-KT levels, apparently related to the timing of spermiation and ovulation of Minj and Finj, respectively, as well as an activation of spermatogenesis (but not spermiation). Injected fish released free and conjugated T, 11-KT and E2 into the water, although immature eels were unable to smell (by electro-olfactogram) any of these steroids or prostaglandin F2 . However, immature males were highly sensitive to water extracts conditioned by spermiating Minj and pre-ovulatory and ovulated Finj. These preliminary results suggest the existence of chemical communication between maturing eels and immature males that stimulates gonad development, although the putative pheromone(s) involved has/have not yet been identified. This work was supported by grants from the Reference Center in Aquaculture (Generalitat de ... |
format |
Article in Journal/Newspaper |
author |
Huertas, Mar Scott, Alexander P. Hubbard, Peter C. Canario, Adelino V. M. Cerdà, Joan |
author_facet |
Huertas, Mar Scott, Alexander P. Hubbard, Peter C. Canario, Adelino V. M. Cerdà, Joan |
author_sort |
Huertas, Mar |
title |
Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: Possible involvement of chemical communication |
title_short |
Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: Possible involvement of chemical communication |
title_full |
Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: Possible involvement of chemical communication |
title_fullStr |
Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: Possible involvement of chemical communication |
title_full_unstemmed |
Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: Possible involvement of chemical communication |
title_sort |
sexually mature european eels (anguilla anguilla l.) stimulate gonadal development of neighbouring males: possible involvement of chemical communication |
publisher |
Elsevier |
publishDate |
2006 |
url |
http://hdl.handle.net/10261/20686 https://doi.org/10.1016/j.ygcen.2006.01.017 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_relation |
https://doi.org/10.1016/j.ygcen.2006.01.017 General and Comparative Endocrinology 147(3): 304–313 (2006) 0016-6480 http://hdl.handle.net/10261/20686 doi:10.1016/j.ygcen.2006.01.017 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.ygcen.2006.01.017 |
container_title |
General and Comparative Endocrinology |
container_volume |
147 |
container_issue |
3 |
container_start_page |
304 |
op_container_end_page |
313 |
_version_ |
1790597789095297024 |