Development of Abundance Indices for Atlantic Cod and Cusk in the Coastal Gulf of Maine from their Bycatch in the Lobster Fishery
Abstract Limited information is available about the abundance of Atlantic Cod Gadus morhua and Cusk Brosme brosme in the coastal Gulf of Maine because the presence of lobster traps limits commercial fishing and surveys for these species. We developed abundance indices for Atlantic Cod and Cusk from...
Published in: | North American Journal of Fisheries Management |
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Online Access: | http://dx.doi.org/10.1080/02755947.2015.1043413 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/02755947.2015.1043413 |
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crwiley:10.1080/02755947.2015.1043413 2024-06-02T08:03:07+00:00 Development of Abundance Indices for Atlantic Cod and Cusk in the Coastal Gulf of Maine from their Bycatch in the Lobster Fishery Zhang, Chongliang Chen, Yong 2015 http://dx.doi.org/10.1080/02755947.2015.1043413 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/02755947.2015.1043413 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor North American Journal of Fisheries Management volume 35, issue 4, page 708-719 ISSN 0275-5947 1548-8675 journal-article 2015 crwiley https://doi.org/10.1080/02755947.2015.1043413 2024-05-03T11:34:12Z Abstract Limited information is available about the abundance of Atlantic Cod Gadus morhua and Cusk Brosme brosme in the coastal Gulf of Maine because the presence of lobster traps limits commercial fishing and surveys for these species. We developed abundance indices for Atlantic Cod and Cusk from bycatch data obtained in a lobster sea sampling program. We applied generalized linear models (GLMs) to standardize Atlantic Cod and Cusk bycatch rates. The CPUE data, measured as the count of Atlantic Cod and Cusk observed per trap haul, are characterized by an extremely skewed distribution with a high percentage of zero observations. Two general approaches were applied to tackle the zero‐dominated data: modeling with different error distributions and aggregating data over spatial scales. We evaluated eight models: binomial, Poisson, negative binomial, Tweedie model, hurdle model (also referred to as the delta approach) with Poisson and negative binomial distribution, and zero‐inflated model with Poisson and negative binomial distribution. The data were aggregated using six grids ranging from 0.01 to 0.5 geological degrees (0.6–30 nautical miles). The standardized CPUE showed a gradual decline from 2006 to 2011, except for 2009 when a slight increase occurred for Atlantic Cod, and a general decline from 2006 to 2010 followed by an increase in 2011 for Cusk. The standardized CPUEs were consistent, in general, among the models and among different spatial aggregation scenarios, suggesting that the CPUE standardization is robust with respect to choices of data aggregation and statistical models. This study highlights the feasibility of developing abundance indices based on bycatch data for monitoring fish stock dynamics in data‐limited regions. Received September 17, 2014; accepted April 16, 2015 Article in Journal/Newspaper atlantic cod Gadus morhua Wiley Online Library North American Journal of Fisheries Management 35 4 708 719 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Limited information is available about the abundance of Atlantic Cod Gadus morhua and Cusk Brosme brosme in the coastal Gulf of Maine because the presence of lobster traps limits commercial fishing and surveys for these species. We developed abundance indices for Atlantic Cod and Cusk from bycatch data obtained in a lobster sea sampling program. We applied generalized linear models (GLMs) to standardize Atlantic Cod and Cusk bycatch rates. The CPUE data, measured as the count of Atlantic Cod and Cusk observed per trap haul, are characterized by an extremely skewed distribution with a high percentage of zero observations. Two general approaches were applied to tackle the zero‐dominated data: modeling with different error distributions and aggregating data over spatial scales. We evaluated eight models: binomial, Poisson, negative binomial, Tweedie model, hurdle model (also referred to as the delta approach) with Poisson and negative binomial distribution, and zero‐inflated model with Poisson and negative binomial distribution. The data were aggregated using six grids ranging from 0.01 to 0.5 geological degrees (0.6–30 nautical miles). The standardized CPUE showed a gradual decline from 2006 to 2011, except for 2009 when a slight increase occurred for Atlantic Cod, and a general decline from 2006 to 2010 followed by an increase in 2011 for Cusk. The standardized CPUEs were consistent, in general, among the models and among different spatial aggregation scenarios, suggesting that the CPUE standardization is robust with respect to choices of data aggregation and statistical models. This study highlights the feasibility of developing abundance indices based on bycatch data for monitoring fish stock dynamics in data‐limited regions. Received September 17, 2014; accepted April 16, 2015 |
format |
Article in Journal/Newspaper |
author |
Zhang, Chongliang Chen, Yong |
spellingShingle |
Zhang, Chongliang Chen, Yong Development of Abundance Indices for Atlantic Cod and Cusk in the Coastal Gulf of Maine from their Bycatch in the Lobster Fishery |
author_facet |
Zhang, Chongliang Chen, Yong |
author_sort |
Zhang, Chongliang |
title |
Development of Abundance Indices for Atlantic Cod and Cusk in the Coastal Gulf of Maine from their Bycatch in the Lobster Fishery |
title_short |
Development of Abundance Indices for Atlantic Cod and Cusk in the Coastal Gulf of Maine from their Bycatch in the Lobster Fishery |
title_full |
Development of Abundance Indices for Atlantic Cod and Cusk in the Coastal Gulf of Maine from their Bycatch in the Lobster Fishery |
title_fullStr |
Development of Abundance Indices for Atlantic Cod and Cusk in the Coastal Gulf of Maine from their Bycatch in the Lobster Fishery |
title_full_unstemmed |
Development of Abundance Indices for Atlantic Cod and Cusk in the Coastal Gulf of Maine from their Bycatch in the Lobster Fishery |
title_sort |
development of abundance indices for atlantic cod and cusk in the coastal gulf of maine from their bycatch in the lobster fishery |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1080/02755947.2015.1043413 https://afspubs.onlinelibrary.wiley.com/doi/pdf/10.1080/02755947.2015.1043413 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
North American Journal of Fisheries Management volume 35, issue 4, page 708-719 ISSN 0275-5947 1548-8675 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1080/02755947.2015.1043413 |
container_title |
North American Journal of Fisheries Management |
container_volume |
35 |
container_issue |
4 |
container_start_page |
708 |
op_container_end_page |
719 |
_version_ |
1800747582655299584 |