A strategy to detect fish discarding by combining onboard and onshore sampling
Discarding of small fish is considered to be an important conservation problem and has become illegal in some fisheries. We present a cost-efficient strategy to help enforce regulations against discarding. A discarding indicator is defined using the change in slope between two reference points on th...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1997
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Online Access: | http://dx.doi.org/10.1139/f97-180 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-180 |
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crcansciencepubl:10.1139/f97-180 2023-12-17T10:27:03+01:00 A strategy to detect fish discarding by combining onboard and onshore sampling Allard, Jacques Chouinard, Ghislain A 1997 http://dx.doi.org/10.1139/f97-180 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-180 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 12, page 2955-2963 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1997 crcansciencepubl https://doi.org/10.1139/f97-180 2023-11-19T13:39:15Z Discarding of small fish is considered to be an important conservation problem and has become illegal in some fisheries. We present a cost-efficient strategy to help enforce regulations against discarding. A discarding indicator is defined using the change in slope between two reference points on the empirical length-frequency density of the catch. This discarding indicator is then used according to the external distribution concept: the sampling distribution of the discarding indicator, when no discarding occurred, is obtained directly from samples taken by onboard observers; the value of the discarding indicator observed by onshore observers from a boat not covered by onboard observers is then compared with this sampling distribution. This procedure offers a nonparametric test for discarding. Application of the strategy is illustrated using data from the 1991 Atlantic cod (Gadus morhua) fishery in the southern Gulf of St. Lawrence. We describe several enforcement frameworks within which the method can be applied. The cost efficiency of the strategy comes from shifting resources from high-cost onboard observation to lower cost onshore observation. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 54 12 2955 2963 |
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Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Allard, Jacques Chouinard, Ghislain A A strategy to detect fish discarding by combining onboard and onshore sampling |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Discarding of small fish is considered to be an important conservation problem and has become illegal in some fisheries. We present a cost-efficient strategy to help enforce regulations against discarding. A discarding indicator is defined using the change in slope between two reference points on the empirical length-frequency density of the catch. This discarding indicator is then used according to the external distribution concept: the sampling distribution of the discarding indicator, when no discarding occurred, is obtained directly from samples taken by onboard observers; the value of the discarding indicator observed by onshore observers from a boat not covered by onboard observers is then compared with this sampling distribution. This procedure offers a nonparametric test for discarding. Application of the strategy is illustrated using data from the 1991 Atlantic cod (Gadus morhua) fishery in the southern Gulf of St. Lawrence. We describe several enforcement frameworks within which the method can be applied. The cost efficiency of the strategy comes from shifting resources from high-cost onboard observation to lower cost onshore observation. |
format |
Article in Journal/Newspaper |
author |
Allard, Jacques Chouinard, Ghislain A |
author_facet |
Allard, Jacques Chouinard, Ghislain A |
author_sort |
Allard, Jacques |
title |
A strategy to detect fish discarding by combining onboard and onshore sampling |
title_short |
A strategy to detect fish discarding by combining onboard and onshore sampling |
title_full |
A strategy to detect fish discarding by combining onboard and onshore sampling |
title_fullStr |
A strategy to detect fish discarding by combining onboard and onshore sampling |
title_full_unstemmed |
A strategy to detect fish discarding by combining onboard and onshore sampling |
title_sort |
strategy to detect fish discarding by combining onboard and onshore sampling |
publisher |
Canadian Science Publishing |
publishDate |
1997 |
url |
http://dx.doi.org/10.1139/f97-180 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-180 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 54, issue 12, page 2955-2963 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f97-180 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
54 |
container_issue |
12 |
container_start_page |
2955 |
op_container_end_page |
2963 |
_version_ |
1785578832370073600 |