Evaluation and Improvement of Fisheries Stock Assessment, from Data Collection to Modeling
Fishery stock assessment is an essential scientific process to provide scientific advice for sustainable utilization of marine resources. The quality of a stock assessment (i.e., the accuracy and precision of stock size and exploitation rate estimates) is related to the quality and quantity of the i...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:etd-3361 2023-06-11T04:10:11+02:00 Evaluation and Improvement of Fisheries Stock Assessment, from Data Collection to Modeling Cao, Jie 2015-05-01T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/etd/2316 https://digitalcommons.library.umaine.edu/context/etd/article/3361/viewcontent/CaoJ2015_OCR.pdf unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/etd/2316 https://digitalcommons.library.umaine.edu/context/etd/article/3361/viewcontent/CaoJ2015_OCR.pdf Electronic Theses and Dissertations Survey designs American lobster Gulf of Maine Marine Biology text 2015 ftmaineuniv 2023-05-04T18:02:23Z Fishery stock assessment is an essential scientific process to provide scientific advice for sustainable utilization of marine resources. The quality of a stock assessment (i.e., the accuracy and precision of stock size and exploitation rate estimates) is related to the quality and quantity of the input data and the sophistication of the stock assessment model. In this dissertation four case studies were conducted to address and evaluate the potential problems in data collection and modeling, with the aim of providing suggestions and solutions to improve fisheries stock assessment. The performances of different survey designs were evaluated for estimating the American lobster density over time in the Gulf of Maine (GOM). The results show that stratified random sampling had stable performance across years and seasons. Additionally, appropriate stratification, such as using depth to determine strata, significantly improved the precision and efficiency over simple random sampling. Incorrect assumptions made in a model, either implicitly or explicitly, can have a substantial impact on stock assessment results and management advice. Misspecification of fishery selectivity, natural mortality and fishery catchability in the assessment model were investigated for the Atlantic herring stock assessment. The results show that misspecifications of key population dynamic processes in modeling could cause retrospective error. Most fish populations exhibit complex spatial structure. However, the assessment of fish populations has historically relied on assumptions that the individuals within a region of interest belong to a "unit stock". Impacts of ignoring spatial structure were quantified for the assessment of Atlantic cod in the GOM. The results show that, while stock mixing causes measurable bias in the stock assessment model, under the conditions we tested in this study, the model still performed well. A size-structured assessment model dedicated to protandric hermaphrodite pandalid stock assessment was developed, with ... Text atlantic cod The University of Maine: DigitalCommons@UMaine |
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Survey designs American lobster Gulf of Maine Marine Biology |
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Survey designs American lobster Gulf of Maine Marine Biology Cao, Jie Evaluation and Improvement of Fisheries Stock Assessment, from Data Collection to Modeling |
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Survey designs American lobster Gulf of Maine Marine Biology |
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Fishery stock assessment is an essential scientific process to provide scientific advice for sustainable utilization of marine resources. The quality of a stock assessment (i.e., the accuracy and precision of stock size and exploitation rate estimates) is related to the quality and quantity of the input data and the sophistication of the stock assessment model. In this dissertation four case studies were conducted to address and evaluate the potential problems in data collection and modeling, with the aim of providing suggestions and solutions to improve fisheries stock assessment. The performances of different survey designs were evaluated for estimating the American lobster density over time in the Gulf of Maine (GOM). The results show that stratified random sampling had stable performance across years and seasons. Additionally, appropriate stratification, such as using depth to determine strata, significantly improved the precision and efficiency over simple random sampling. Incorrect assumptions made in a model, either implicitly or explicitly, can have a substantial impact on stock assessment results and management advice. Misspecification of fishery selectivity, natural mortality and fishery catchability in the assessment model were investigated for the Atlantic herring stock assessment. The results show that misspecifications of key population dynamic processes in modeling could cause retrospective error. Most fish populations exhibit complex spatial structure. However, the assessment of fish populations has historically relied on assumptions that the individuals within a region of interest belong to a "unit stock". Impacts of ignoring spatial structure were quantified for the assessment of Atlantic cod in the GOM. The results show that, while stock mixing causes measurable bias in the stock assessment model, under the conditions we tested in this study, the model still performed well. A size-structured assessment model dedicated to protandric hermaphrodite pandalid stock assessment was developed, with ... |
format |
Text |
author |
Cao, Jie |
author_facet |
Cao, Jie |
author_sort |
Cao, Jie |
title |
Evaluation and Improvement of Fisheries Stock Assessment, from Data Collection to Modeling |
title_short |
Evaluation and Improvement of Fisheries Stock Assessment, from Data Collection to Modeling |
title_full |
Evaluation and Improvement of Fisheries Stock Assessment, from Data Collection to Modeling |
title_fullStr |
Evaluation and Improvement of Fisheries Stock Assessment, from Data Collection to Modeling |
title_full_unstemmed |
Evaluation and Improvement of Fisheries Stock Assessment, from Data Collection to Modeling |
title_sort |
evaluation and improvement of fisheries stock assessment, from data collection to modeling |
publisher |
DigitalCommons@UMaine |
publishDate |
2015 |
url |
https://digitalcommons.library.umaine.edu/etd/2316 https://digitalcommons.library.umaine.edu/context/etd/article/3361/viewcontent/CaoJ2015_OCR.pdf |
genre |
atlantic cod |
genre_facet |
atlantic cod |
op_source |
Electronic Theses and Dissertations |
op_relation |
https://digitalcommons.library.umaine.edu/etd/2316 https://digitalcommons.library.umaine.edu/context/etd/article/3361/viewcontent/CaoJ2015_OCR.pdf |
_version_ |
1768384450659352576 |