Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects
More and more fishery researchers begin to acknowledge that one-dimensional biomass models may omit key information when generating management guidelines. For the more complicated age-structured models, numerous parameters require a proper estimation or a reasonable assumption. In this paper, the ef...
Main Author: | |
---|---|
Format: | Report |
Language: | unknown |
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2612461 |
id |
ftrepec:oai:RePEc:hhs:nhhfms:2019_004 |
---|---|
record_format |
openpolar |
spelling |
ftrepec:oai:RePEc:hhs:nhhfms:2019_004 2024-04-14T08:16:28+00:00 Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects Ni, Yuanming http://hdl.handle.net/11250/2612461 unknown http://hdl.handle.net/11250/2612461 preprint ftrepec 2024-03-19T10:30:05Z More and more fishery researchers begin to acknowledge that one-dimensional biomass models may omit key information when generating management guidelines. For the more complicated age-structured models, numerous parameters require a proper estimation or a reasonable assumption. In this paper, the effects of recruitment patterns and environmental impacts on the optimal exploitation of a fish population are investigated. Based on a discrete-time age-structured bioeconomic model of Northeast Atlantic mackerel, we introduce the mechanisms that generate 6 scenarios of the problem. Using the simplest scenario, optimizations are conducted under 8 different parameter combinations. Then, the problem is solved for each scenario and simulations are conducted with constant fishing mortalities. It is found that a higher environmental volatility leads to more net profits but with a lower probability of achieving the mean values. Any parameter combination that favours the older fish tends to lend itself to pulse fishing pattern. The simulations indicate that a constant fishing mortality around 0.06 performs the best. A comparison between the optimal and the historical harvest shows that for more than 70% of the time, the optimal exploitation precedes the historical one, leading to 43% higher net profit and 34% lower fishing cost. Age-structured; bioeconomic; recruitment; optimization Report Northeast Atlantic RePEc (Research Papers in Economics) |
institution |
Open Polar |
collection |
RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
More and more fishery researchers begin to acknowledge that one-dimensional biomass models may omit key information when generating management guidelines. For the more complicated age-structured models, numerous parameters require a proper estimation or a reasonable assumption. In this paper, the effects of recruitment patterns and environmental impacts on the optimal exploitation of a fish population are investigated. Based on a discrete-time age-structured bioeconomic model of Northeast Atlantic mackerel, we introduce the mechanisms that generate 6 scenarios of the problem. Using the simplest scenario, optimizations are conducted under 8 different parameter combinations. Then, the problem is solved for each scenario and simulations are conducted with constant fishing mortalities. It is found that a higher environmental volatility leads to more net profits but with a lower probability of achieving the mean values. Any parameter combination that favours the older fish tends to lend itself to pulse fishing pattern. The simulations indicate that a constant fishing mortality around 0.06 performs the best. A comparison between the optimal and the historical harvest shows that for more than 70% of the time, the optimal exploitation precedes the historical one, leading to 43% higher net profit and 34% lower fishing cost. Age-structured; bioeconomic; recruitment; optimization |
format |
Report |
author |
Ni, Yuanming |
spellingShingle |
Ni, Yuanming Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects |
author_facet |
Ni, Yuanming |
author_sort |
Ni, Yuanming |
title |
Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects |
title_short |
Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects |
title_full |
Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects |
title_fullStr |
Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects |
title_full_unstemmed |
Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects |
title_sort |
optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects |
url |
http://hdl.handle.net/11250/2612461 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
http://hdl.handle.net/11250/2612461 |
_version_ |
1796315153289969664 |