Optimizing the mass marking of fish with alizarin red S: an example with glass eels.
Fish marking is an essential tool for fisheries management, especially for evaluating the stocking of endangered fish species to support conservation and sustainable use of fish stocks. Batch marking of young European eels Anguilla anguilla (L.) prior to stocking is recommended as the benefits of st...
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ftpubmed:38174589 2024-05-12T07:52:58+00:00 Optimizing the mass marking of fish with alizarin red S: an example with glass eels. Simon, Janek 2024 Apr https://doi.org/10.1111/jfb.15643 https://pubmed.ncbi.nlm.nih.gov/38174589 eng eng Wiley https://doi.org/10.1111/jfb.15643 https://pubmed.ncbi.nlm.nih.gov/38174589 © 2024 The Authors. Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles. J Fish Biol ISSN:1095-8649 Volume:104 Issue:4 Anguilla anguilla marking cost marking success stocking survival Journal Article 2024 ftpubmed https://doi.org/10.1111/jfb.15643 2024-04-12T16:03:00Z Fish marking is an essential tool for fisheries management, especially for evaluating the stocking of endangered fish species to support conservation and sustainable use of fish stocks. Batch marking of young European eels Anguilla anguilla (L.) prior to stocking is recommended as the benefits of stocking for the spawning stock can be evaluated by recapturing marked fish over time, therefore mass marking of young eels with substances such as alizarin red S (ARS) is becoming increasingly important. To improve the marking method and reduce marking costs when immersing glass eels in an ARS solution, eight laboratory experiments under varying conditions (e.g., temperature, ARS concentration, immersion time, osmotic induction, fish density) and with ARS from different suppliers were carried out. The results show that optimal marking of glass eels can be carried out in the field or during transport by putting approximately 50 g of glass eels per liter in 150 mg L-1 ARS solution for 3 h at 10-15°C. Lower concentrations did not result in reliable marking. Water temperatures of 5°C and below can have a stunning effect on the eels and increase mortality significantly, regardless of the concentration of ARS. Glass eel densities below 50 g L-1 in the marking bath increase marking costs unnecessarily, while a higher density of 100 g L-1 resulted in significantly higher mortality and lower marking success. A somewhat more difficult but less expensive alternative is to bathe the fish in a saline solution of 1% (10 PSU) of 80 mg L-1 ARS for 3 h at 10°C. Costs can also be significantly reduced by choice of supplier for ARS, but care should be taken as the quality of the powder appears to vary (mean percentage of sufficiently marked eels ranged from 59% to 91% among suppliers in the present study) and can lead to marking failure. The optimal marking conditions can help ensure that stocked glass eels can be reliably identified in future studies to assess stocking benefits while reducing costs. Article in Journal/Newspaper Anguilla anguilla PubMed Central (PMC) Journal of Fish Biology 104 4 1079 1090 |
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English |
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Anguilla anguilla marking cost marking success stocking survival |
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Anguilla anguilla marking cost marking success stocking survival Simon, Janek Optimizing the mass marking of fish with alizarin red S: an example with glass eels. |
topic_facet |
Anguilla anguilla marking cost marking success stocking survival |
description |
Fish marking is an essential tool for fisheries management, especially for evaluating the stocking of endangered fish species to support conservation and sustainable use of fish stocks. Batch marking of young European eels Anguilla anguilla (L.) prior to stocking is recommended as the benefits of stocking for the spawning stock can be evaluated by recapturing marked fish over time, therefore mass marking of young eels with substances such as alizarin red S (ARS) is becoming increasingly important. To improve the marking method and reduce marking costs when immersing glass eels in an ARS solution, eight laboratory experiments under varying conditions (e.g., temperature, ARS concentration, immersion time, osmotic induction, fish density) and with ARS from different suppliers were carried out. The results show that optimal marking of glass eels can be carried out in the field or during transport by putting approximately 50 g of glass eels per liter in 150 mg L-1 ARS solution for 3 h at 10-15°C. Lower concentrations did not result in reliable marking. Water temperatures of 5°C and below can have a stunning effect on the eels and increase mortality significantly, regardless of the concentration of ARS. Glass eel densities below 50 g L-1 in the marking bath increase marking costs unnecessarily, while a higher density of 100 g L-1 resulted in significantly higher mortality and lower marking success. A somewhat more difficult but less expensive alternative is to bathe the fish in a saline solution of 1% (10 PSU) of 80 mg L-1 ARS for 3 h at 10°C. Costs can also be significantly reduced by choice of supplier for ARS, but care should be taken as the quality of the powder appears to vary (mean percentage of sufficiently marked eels ranged from 59% to 91% among suppliers in the present study) and can lead to marking failure. The optimal marking conditions can help ensure that stocked glass eels can be reliably identified in future studies to assess stocking benefits while reducing costs. |
format |
Article in Journal/Newspaper |
author |
Simon, Janek |
author_facet |
Simon, Janek |
author_sort |
Simon, Janek |
title |
Optimizing the mass marking of fish with alizarin red S: an example with glass eels. |
title_short |
Optimizing the mass marking of fish with alizarin red S: an example with glass eels. |
title_full |
Optimizing the mass marking of fish with alizarin red S: an example with glass eels. |
title_fullStr |
Optimizing the mass marking of fish with alizarin red S: an example with glass eels. |
title_full_unstemmed |
Optimizing the mass marking of fish with alizarin red S: an example with glass eels. |
title_sort |
optimizing the mass marking of fish with alizarin red s: an example with glass eels. |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1111/jfb.15643 https://pubmed.ncbi.nlm.nih.gov/38174589 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
J Fish Biol ISSN:1095-8649 Volume:104 Issue:4 |
op_relation |
https://doi.org/10.1111/jfb.15643 https://pubmed.ncbi.nlm.nih.gov/38174589 |
op_rights |
© 2024 The Authors. Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles. |
op_doi |
https://doi.org/10.1111/jfb.15643 |
container_title |
Journal of Fish Biology |
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104 |
container_issue |
4 |
container_start_page |
1079 |
op_container_end_page |
1090 |
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