Stock Assessment of the Lemon Shark off the Southeast United States
Abstract The Lemon Shark Negaprion brevirostris is a large coastal shark that commonly occurs in the shallow nearshore waters of the tropical western Atlantic Ocean. There are conservation concerns for this species due to fisheries exploitation, low productivity, anthropogenic disturbance at nursery...
Published in: | North American Journal of Fisheries Management |
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crwiley:10.1002/nafm.10518 2024-06-02T08:11:29+00:00 Stock Assessment of the Lemon Shark off the Southeast United States Hansell, Alexander C. Curtis, Tobey H. Carlson, John Cortés, Enric Fay, Gavin Cadrin, Steven X. 2021 http://dx.doi.org/10.1002/nafm.10518 https://onlinelibrary.wiley.com/doi/pdf/10.1002/nafm.10518 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/nafm.10518 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1002/nafm.10518 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor North American Journal of Fisheries Management volume 41, issue 1, page 35-48 ISSN 0275-5947 1548-8675 journal-article 2021 crwiley https://doi.org/10.1002/nafm.10518 2024-05-03T11:57:03Z Abstract The Lemon Shark Negaprion brevirostris is a large coastal shark that commonly occurs in the shallow nearshore waters of the tropical western Atlantic Ocean. There are conservation concerns for this species due to fisheries exploitation, low productivity, anthropogenic disturbance at nursery sites, and the depleted status of other large coastal sharks, but no quantitative assessment of Lemon Shark stock status is available. We synthesized available data to develop a stock assessment of the Lemon Shark in the western North Atlantic. All information on stock identity was considered to define a fishery management unit off the southeastern United States. Stock abundance and trends in fishing mortality were estimated from 1981 to 2017 using a Bayesian state–space surplus production model. The model incorporated prior knowledge of Lemon Shark demography, catches, and a combination of 11 indices of abundance. Seven model configurations that fit the data well and produced plausible estimates were used to evaluate the sensitivity of posterior estimates to assumed priors and data decisions. Results suggested that Lemon Shark stock abundance has been relatively stable since the mid‐1990s, with some estimates of prior depletion. Estimates of relative fishing mortality indicate earlier periods of overfishing, with a decrease in fishing mortality since the early 2000s. These estimates of population trends provide information for future fisheries management and conservation. Article in Journal/Newspaper North Atlantic Wiley Online Library North American Journal of Fisheries Management 41 1 35 48 |
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Wiley Online Library |
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language |
English |
description |
Abstract The Lemon Shark Negaprion brevirostris is a large coastal shark that commonly occurs in the shallow nearshore waters of the tropical western Atlantic Ocean. There are conservation concerns for this species due to fisheries exploitation, low productivity, anthropogenic disturbance at nursery sites, and the depleted status of other large coastal sharks, but no quantitative assessment of Lemon Shark stock status is available. We synthesized available data to develop a stock assessment of the Lemon Shark in the western North Atlantic. All information on stock identity was considered to define a fishery management unit off the southeastern United States. Stock abundance and trends in fishing mortality were estimated from 1981 to 2017 using a Bayesian state–space surplus production model. The model incorporated prior knowledge of Lemon Shark demography, catches, and a combination of 11 indices of abundance. Seven model configurations that fit the data well and produced plausible estimates were used to evaluate the sensitivity of posterior estimates to assumed priors and data decisions. Results suggested that Lemon Shark stock abundance has been relatively stable since the mid‐1990s, with some estimates of prior depletion. Estimates of relative fishing mortality indicate earlier periods of overfishing, with a decrease in fishing mortality since the early 2000s. These estimates of population trends provide information for future fisheries management and conservation. |
format |
Article in Journal/Newspaper |
author |
Hansell, Alexander C. Curtis, Tobey H. Carlson, John Cortés, Enric Fay, Gavin Cadrin, Steven X. |
spellingShingle |
Hansell, Alexander C. Curtis, Tobey H. Carlson, John Cortés, Enric Fay, Gavin Cadrin, Steven X. Stock Assessment of the Lemon Shark off the Southeast United States |
author_facet |
Hansell, Alexander C. Curtis, Tobey H. Carlson, John Cortés, Enric Fay, Gavin Cadrin, Steven X. |
author_sort |
Hansell, Alexander C. |
title |
Stock Assessment of the Lemon Shark off the Southeast United States |
title_short |
Stock Assessment of the Lemon Shark off the Southeast United States |
title_full |
Stock Assessment of the Lemon Shark off the Southeast United States |
title_fullStr |
Stock Assessment of the Lemon Shark off the Southeast United States |
title_full_unstemmed |
Stock Assessment of the Lemon Shark off the Southeast United States |
title_sort |
stock assessment of the lemon shark off the southeast united states |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/nafm.10518 https://onlinelibrary.wiley.com/doi/pdf/10.1002/nafm.10518 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/nafm.10518 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1002/nafm.10518 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
North American Journal of Fisheries Management volume 41, issue 1, page 35-48 ISSN 0275-5947 1548-8675 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/nafm.10518 |
container_title |
North American Journal of Fisheries Management |
container_volume |
41 |
container_issue |
1 |
container_start_page |
35 |
op_container_end_page |
48 |
_version_ |
1800757632411107328 |