Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model
Egg mortality is a key parameter for understanding early life histories of fish. Small variations in estimated mortality cause large differences on adult fish biomass estimates. Therefore, the assumption of a constant egg mortality rate may be misleading. Here, we show how to estimate mortality rate...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | https://strathprints.strath.ac.uk/10317/ https://doi.org/10.1139/F07-128 |
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ftustrathclyde:oai:strathprints.strath.ac.uk:10317 2024-04-28T08:32:10+00:00 Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model Portilla, E. McKenzie, E. Beare, D. Reid, D.G. 2007-12 https://strathprints.strath.ac.uk/10317/ https://doi.org/10.1139/F07-128 unknown Portilla, E. <https://strathprints.strath.ac.uk/view/author/385910.html> and McKenzie, E. <https://strathprints.strath.ac.uk/view/author/21709.html> and Beare, D. and Reid, D.G. (2007 <https://strathprints.strath.ac.uk/view/year/2007.html>) Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model. Canadian Journal of Fisheries and Aquatic Sciences <https://strathprints.strath.ac.uk/view/publications/Canadian_Journal_of_Fisheries_and_Aquatic_Sciences.html>, 64 (12). pp. 1656-1668. ISSN 1205-7533 Probabilities. Mathematical statistics Article PeerReviewed 2007 ftustrathclyde https://doi.org/10.1139/F07-128 2024-04-10T00:33:51Z Egg mortality is a key parameter for understanding early life histories of fish. Small variations in estimated mortality cause large differences on adult fish biomass estimates. Therefore, the assumption of a constant egg mortality rate may be misleading. Here, we show how to estimate mortality rates for the individual egg stages of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) from triennial surveys conducted since 1977. We use a standard, continuous-time Markov process model that combines the numbers of eggs sampled in each stage with experimental data on egg stage duration (dependent on water temperature). This is the first attempt to study mortality among egg stages in such detail and the first comprehensive effort to estimate horse mackerel egg mortality in the Northeast Atlantic. The results include detailed descriptions of spatial-temporal dependencies in mortality. The daily egg mortality rates estimated are ˜0.56·day[sup-1] for Atlantic mackerel (far higher than suggested in the literature) and 0.54-day[sup-1] for horse mackerel. Although it was not possible to estimate stage 1 egg mortality directly, the results suggest high mortality in the first stage. This might lead to underestimation of fish biomass when assessed traditionally by egg survey data alone. Article in Journal/Newspaper Northeast Atlantic University of Strathclyde Glasgow: Strathprints Canadian Journal of Fisheries and Aquatic Sciences 64 12 1656 1668 |
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Open Polar |
collection |
University of Strathclyde Glasgow: Strathprints |
op_collection_id |
ftustrathclyde |
language |
unknown |
topic |
Probabilities. Mathematical statistics |
spellingShingle |
Probabilities. Mathematical statistics Portilla, E. McKenzie, E. Beare, D. Reid, D.G. Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model |
topic_facet |
Probabilities. Mathematical statistics |
description |
Egg mortality is a key parameter for understanding early life histories of fish. Small variations in estimated mortality cause large differences on adult fish biomass estimates. Therefore, the assumption of a constant egg mortality rate may be misleading. Here, we show how to estimate mortality rates for the individual egg stages of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) from triennial surveys conducted since 1977. We use a standard, continuous-time Markov process model that combines the numbers of eggs sampled in each stage with experimental data on egg stage duration (dependent on water temperature). This is the first attempt to study mortality among egg stages in such detail and the first comprehensive effort to estimate horse mackerel egg mortality in the Northeast Atlantic. The results include detailed descriptions of spatial-temporal dependencies in mortality. The daily egg mortality rates estimated are ˜0.56·day[sup-1] for Atlantic mackerel (far higher than suggested in the literature) and 0.54-day[sup-1] for horse mackerel. Although it was not possible to estimate stage 1 egg mortality directly, the results suggest high mortality in the first stage. This might lead to underestimation of fish biomass when assessed traditionally by egg survey data alone. |
format |
Article in Journal/Newspaper |
author |
Portilla, E. McKenzie, E. Beare, D. Reid, D.G. |
author_facet |
Portilla, E. McKenzie, E. Beare, D. Reid, D.G. |
author_sort |
Portilla, E. |
title |
Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model |
title_short |
Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model |
title_full |
Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model |
title_fullStr |
Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model |
title_full_unstemmed |
Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model |
title_sort |
estimating natural interstage egg mortality of atlantic mackerel (scomber scombrus) and horse mackerel (trachurus trachurus) in the northeast atlantic using a stochastic model |
publishDate |
2007 |
url |
https://strathprints.strath.ac.uk/10317/ https://doi.org/10.1139/F07-128 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
Portilla, E. <https://strathprints.strath.ac.uk/view/author/385910.html> and McKenzie, E. <https://strathprints.strath.ac.uk/view/author/21709.html> and Beare, D. and Reid, D.G. (2007 <https://strathprints.strath.ac.uk/view/year/2007.html>) Estimating natural interstage egg mortality of Atlantic mackerel (Scomber scombrus) and horse mackerel (Trachurus trachurus) in the Northeast Atlantic using a stochastic model. Canadian Journal of Fisheries and Aquatic Sciences <https://strathprints.strath.ac.uk/view/publications/Canadian_Journal_of_Fisheries_and_Aquatic_Sciences.html>, 64 (12). pp. 1656-1668. ISSN 1205-7533 |
op_doi |
https://doi.org/10.1139/F07-128 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
64 |
container_issue |
12 |
container_start_page |
1656 |
op_container_end_page |
1668 |
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1797589458611077120 |