Experimental analysis of the thermal and salinity preferences of glass‐eels, Anguilla anguilla (L.), before and during the upstream migration
During their upstream migration European glass‐eels, Anguilla anguilla (L.), encounter a series of varying environmental situations. The migration requires a sequence of physiological adaptations determined by the different chemico‐physical conditions they meet. Temperature and salinity are two of t...
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1988
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crwiley:10.1111/j.1095-8649.1988.tb05517.x 2024-09-15T17:39:37+00:00 Experimental analysis of the thermal and salinity preferences of glass‐eels, Anguilla anguilla (L.), before and during the upstream migration Tosi, L. Sala, L. Sola, C. Spampanato, A. Tongiorgi, P. 1988 http://dx.doi.org/10.1111/j.1095-8649.1988.tb05517.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1988.tb05517.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1988.tb05517.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 33, issue 5, page 721-733 ISSN 0022-1112 1095-8649 journal-article 1988 crwiley https://doi.org/10.1111/j.1095-8649.1988.tb05517.x 2024-08-06T04:18:15Z During their upstream migration European glass‐eels, Anguilla anguilla (L.), encounter a series of varying environmental situations. The migration requires a sequence of physiological adaptations determined by the different chemico‐physical conditions they meet. Temperature and salinity are two of the most important factors. It is reasonable that glass‐eels may utilize them as cues to orientation. Laboratory experiments were designed to elucidate the thermal and salinity preferences of glass‐eels. These were assessed by examining the choices of specimens caught either at sea and then kept in salt water (33%), or in the Arno river and then reared in fresh water. Water flows, triggering the rheotactic reaction, prompted glass‐eels to choose between two different salinities and/or temperatures. The results confirm the preference of glass‐eels for flows whose temperature does not differ from that of acclimation. Specimens tested towards two water flows, both at different temperatures from that of acclimation, preferred the colder. Fresh water was usually preferred to salt water, this preference being not so marked in the case of the glass‐eels caught at sea and thus not yet adapted to fresh water. Clear‐cut choices were recorded when one of the tested flows presented both the preferred temperature and preferred salinity. When only one of the two parameters reproduced the preferred situation, the choices were differently affected by temperature and salinity at different values of temperature. When the temperature of both flows was below 11–12°C, glass‐eels preferred fresh water; at higher temperatures the colder of the two flows was preferred, even if salty. Article in Journal/Newspaper Anguilla anguilla Wiley Online Library Journal of Fish Biology 33 5 721 733 |
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During their upstream migration European glass‐eels, Anguilla anguilla (L.), encounter a series of varying environmental situations. The migration requires a sequence of physiological adaptations determined by the different chemico‐physical conditions they meet. Temperature and salinity are two of the most important factors. It is reasonable that glass‐eels may utilize them as cues to orientation. Laboratory experiments were designed to elucidate the thermal and salinity preferences of glass‐eels. These were assessed by examining the choices of specimens caught either at sea and then kept in salt water (33%), or in the Arno river and then reared in fresh water. Water flows, triggering the rheotactic reaction, prompted glass‐eels to choose between two different salinities and/or temperatures. The results confirm the preference of glass‐eels for flows whose temperature does not differ from that of acclimation. Specimens tested towards two water flows, both at different temperatures from that of acclimation, preferred the colder. Fresh water was usually preferred to salt water, this preference being not so marked in the case of the glass‐eels caught at sea and thus not yet adapted to fresh water. Clear‐cut choices were recorded when one of the tested flows presented both the preferred temperature and preferred salinity. When only one of the two parameters reproduced the preferred situation, the choices were differently affected by temperature and salinity at different values of temperature. When the temperature of both flows was below 11–12°C, glass‐eels preferred fresh water; at higher temperatures the colder of the two flows was preferred, even if salty. |
format |
Article in Journal/Newspaper |
author |
Tosi, L. Sala, L. Sola, C. Spampanato, A. Tongiorgi, P. |
spellingShingle |
Tosi, L. Sala, L. Sola, C. Spampanato, A. Tongiorgi, P. Experimental analysis of the thermal and salinity preferences of glass‐eels, Anguilla anguilla (L.), before and during the upstream migration |
author_facet |
Tosi, L. Sala, L. Sola, C. Spampanato, A. Tongiorgi, P. |
author_sort |
Tosi, L. |
title |
Experimental analysis of the thermal and salinity preferences of glass‐eels, Anguilla anguilla (L.), before and during the upstream migration |
title_short |
Experimental analysis of the thermal and salinity preferences of glass‐eels, Anguilla anguilla (L.), before and during the upstream migration |
title_full |
Experimental analysis of the thermal and salinity preferences of glass‐eels, Anguilla anguilla (L.), before and during the upstream migration |
title_fullStr |
Experimental analysis of the thermal and salinity preferences of glass‐eels, Anguilla anguilla (L.), before and during the upstream migration |
title_full_unstemmed |
Experimental analysis of the thermal and salinity preferences of glass‐eels, Anguilla anguilla (L.), before and during the upstream migration |
title_sort |
experimental analysis of the thermal and salinity preferences of glass‐eels, anguilla anguilla (l.), before and during the upstream migration |
publisher |
Wiley |
publishDate |
1988 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1988.tb05517.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1988.tb05517.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1988.tb05517.x |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Journal of Fish Biology volume 33, issue 5, page 721-733 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1988.tb05517.x |
container_title |
Journal of Fish Biology |
container_volume |
33 |
container_issue |
5 |
container_start_page |
721 |
op_container_end_page |
733 |
_version_ |
1810481255131643904 |