Evaluation of the Reproductive Performance of Females of Anguilla anguilla Characterized by Different Levels of Silvering
The European eel, Anguilla anguilla (Linnaeus, 1758), is a species of high conservation and commercial value. Also, with a high aquacultural value, it was one of the most farmed species in Europe before its decline. Conservation measures for this species are currently being implemented, some of whic...
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ftdoajarticles:oai:doaj.org/article:69ed179dd5be4d6f874f9efd04009339 2023-11-12T04:01:12+01:00 Evaluation of the Reproductive Performance of Females of Anguilla anguilla Characterized by Different Levels of Silvering Oliviero Mordenti Laura Gentile Pietro Emmanuele Bálint Lóránt Hausz Riccardo Brusa Antonio Casalini 2023-09-01T00:00:00Z https://doi.org/10.3390/app131910718 https://doaj.org/article/69ed179dd5be4d6f874f9efd04009339 EN eng MDPI AG https://www.mdpi.com/2076-3417/13/19/10718 https://doaj.org/toc/2076-3417 doi:10.3390/app131910718 2076-3417 https://doaj.org/article/69ed179dd5be4d6f874f9efd04009339 Applied Sciences, Vol 13, Iss 10718, p 10718 (2023) European eel artificial reproduction egg production egg quality aquaculture Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 article 2023 ftdoajarticles https://doi.org/10.3390/app131910718 2023-10-15T00:35:48Z The European eel, Anguilla anguilla (Linnaeus, 1758), is a species of high conservation and commercial value. Also, with a high aquacultural value, it was one of the most farmed species in Europe before its decline. Conservation measures for this species are currently being implemented, some of which are the release of adults to allow them to migrate to spawning grounds and artificial reproduction to minimise the impact of overfishing. Much progress has been made regarding the closing of the life cycle, but several problems remain to be solved, such as the weaning and growth of larvae. In this regard, the study of local populations and the identification of the best spawners could be a good way forward as it would help to identify spawners with high reproductive potential and good offspring quality. In this study, we compared the reproductive performance of female eels from migratory areas of the Northern Adriatic Sea at different maturation stages (10 pre-migrant stage; 10 migrant stage), treating both groups with the same hormonal protocol (weekly carp pituitary extract, injection of 17α,20β-Dihydroxy-4-pregnen-3-one at complete oocyte maturation). The research showed that eels at the beginning of metamorphosis (SI III), i.e., eels not yet ready to undertake migration, achieve reproductive performance equal to that of eels ready for migration (SI IV). Their performance was on par in both qualitative and quantitative terms. The optimal results in hatching (with values of 65.8 ± 3.2% for pre-migrant and 68.2 ± 4.1% for migrant) and survival rates (with value of 25.7 ± 5.4% pre-migrants; 27.2 ± 3.7% migrants), as well as the results about the time to reach full gonadal maturation, may have positive implications when considering release and restocking measures. Article in Journal/Newspaper Anguilla anguilla European eel Directory of Open Access Journals: DOAJ Articles Applied Sciences 13 19 10718 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
European eel artificial reproduction egg production egg quality aquaculture Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
European eel artificial reproduction egg production egg quality aquaculture Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Oliviero Mordenti Laura Gentile Pietro Emmanuele Bálint Lóránt Hausz Riccardo Brusa Antonio Casalini Evaluation of the Reproductive Performance of Females of Anguilla anguilla Characterized by Different Levels of Silvering |
topic_facet |
European eel artificial reproduction egg production egg quality aquaculture Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 |
description |
The European eel, Anguilla anguilla (Linnaeus, 1758), is a species of high conservation and commercial value. Also, with a high aquacultural value, it was one of the most farmed species in Europe before its decline. Conservation measures for this species are currently being implemented, some of which are the release of adults to allow them to migrate to spawning grounds and artificial reproduction to minimise the impact of overfishing. Much progress has been made regarding the closing of the life cycle, but several problems remain to be solved, such as the weaning and growth of larvae. In this regard, the study of local populations and the identification of the best spawners could be a good way forward as it would help to identify spawners with high reproductive potential and good offspring quality. In this study, we compared the reproductive performance of female eels from migratory areas of the Northern Adriatic Sea at different maturation stages (10 pre-migrant stage; 10 migrant stage), treating both groups with the same hormonal protocol (weekly carp pituitary extract, injection of 17α,20β-Dihydroxy-4-pregnen-3-one at complete oocyte maturation). The research showed that eels at the beginning of metamorphosis (SI III), i.e., eels not yet ready to undertake migration, achieve reproductive performance equal to that of eels ready for migration (SI IV). Their performance was on par in both qualitative and quantitative terms. The optimal results in hatching (with values of 65.8 ± 3.2% for pre-migrant and 68.2 ± 4.1% for migrant) and survival rates (with value of 25.7 ± 5.4% pre-migrants; 27.2 ± 3.7% migrants), as well as the results about the time to reach full gonadal maturation, may have positive implications when considering release and restocking measures. |
format |
Article in Journal/Newspaper |
author |
Oliviero Mordenti Laura Gentile Pietro Emmanuele Bálint Lóránt Hausz Riccardo Brusa Antonio Casalini |
author_facet |
Oliviero Mordenti Laura Gentile Pietro Emmanuele Bálint Lóránt Hausz Riccardo Brusa Antonio Casalini |
author_sort |
Oliviero Mordenti |
title |
Evaluation of the Reproductive Performance of Females of Anguilla anguilla Characterized by Different Levels of Silvering |
title_short |
Evaluation of the Reproductive Performance of Females of Anguilla anguilla Characterized by Different Levels of Silvering |
title_full |
Evaluation of the Reproductive Performance of Females of Anguilla anguilla Characterized by Different Levels of Silvering |
title_fullStr |
Evaluation of the Reproductive Performance of Females of Anguilla anguilla Characterized by Different Levels of Silvering |
title_full_unstemmed |
Evaluation of the Reproductive Performance of Females of Anguilla anguilla Characterized by Different Levels of Silvering |
title_sort |
evaluation of the reproductive performance of females of anguilla anguilla characterized by different levels of silvering |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/app131910718 https://doaj.org/article/69ed179dd5be4d6f874f9efd04009339 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_source |
Applied Sciences, Vol 13, Iss 10718, p 10718 (2023) |
op_relation |
https://www.mdpi.com/2076-3417/13/19/10718 https://doaj.org/toc/2076-3417 doi:10.3390/app131910718 2076-3417 https://doaj.org/article/69ed179dd5be4d6f874f9efd04009339 |
op_doi |
https://doi.org/10.3390/app131910718 |
container_title |
Applied Sciences |
container_volume |
13 |
container_issue |
19 |
container_start_page |
10718 |
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1782331139580493824 |