Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio)
<qd> Hammond, C. F., Conquest, L. L., and Rose, C. S. 2013. Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab ( Chionoecetes bairdi ) and snow crab ( C. opilio ). – ICES Journal of Marine Science, 70: . </q...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
2013
|
Subjects: | |
Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/70/7/1308 https://doi.org/10.1093/icesjms/fst085 |
id |
fthighwire:oai:open-archive.highwire.org:icesjms:70/7/1308 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:icesjms:70/7/1308 2023-05-15T15:44:00+02:00 Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio) Hammond, Carwyn F. Conquest, Loveday L. Rose, Craig S. 2013-11-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/70/7/1308 https://doi.org/10.1093/icesjms/fst085 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/70/7/1308 http://dx.doi.org/10.1093/icesjms/fst085 Copyright (C) 2013, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Original Articles TEXT 2013 fthighwire https://doi.org/10.1093/icesjms/fst085 2015-02-28T21:39:18Z <qd> Hammond, C. F., Conquest, L. L., and Rose, C. S. 2013. Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab ( Chionoecetes bairdi ) and snow crab ( C. opilio ). – ICES Journal of Marine Science, 70: . </qd>Management of Bering Sea crab and groundfish fisheries must account for the delayed (and hence unobserved) mortality of crab that encounter bottom trawls, but are not captured. A new approach to predicting the delayed mortality of crab uses a reflex action mortality predictor (RAMP) model to establish a relationship between mortality and reflex impairments. A 2007 pilot study of 649 crab established RAMP curves for both Tanner crab ( Chionoecetes bairdi ) and snow crab ( C. opilio ). Additional data (1775 crab) collected in 2008 allowed us to update the existing RAMP curves to more fully examine the effect of injury scores on the RAMP models and to determine the best method for estimating overall mortality. Results confirmed that the additional measurements did not significantly alter the original relationship between mortality and reflex impairment score. Additionally, the RAMP curves were used to predict unobserved mortality from observed reflex impairment scores of Chionoecetes spp. captured after encounters with different parts of bottom trawl gear (footrope and sweep) and alternative types of footrope and sweep. In addition to estimating mortality rates caused by each gear part, we tested whether the alternative footrope and sweep designs reduced the unobserved mortality rates of crab. Results showed that the alternative footrope (58 cm disk footrope) reduced mortality from 11.4 to 7.2% for Tanner crab and from 9.7 to 5.0% for snow crab . The alternative (off-bottom) sweep reduced mortality from 4.1 to 1.0% for Tanner crab and from 4.9 to 0.0% for snow crab. Thus, the use of the reflex impairment score through the RAMP model is a cost effective way to estimate delayed mortality and to assess the effect of ... Text Bering Sea Snow crab Chionoecetes bairdi Tanner crab HighWire Press (Stanford University) Bering Sea The Ramp ENVELOPE(-38.305,-38.305,-53.990,-53.990) ICES Journal of Marine Science 70 7 1308 1318 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Original Articles |
spellingShingle |
Original Articles Hammond, Carwyn F. Conquest, Loveday L. Rose, Craig S. Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio) |
topic_facet |
Original Articles |
description |
<qd> Hammond, C. F., Conquest, L. L., and Rose, C. S. 2013. Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab ( Chionoecetes bairdi ) and snow crab ( C. opilio ). – ICES Journal of Marine Science, 70: . </qd>Management of Bering Sea crab and groundfish fisheries must account for the delayed (and hence unobserved) mortality of crab that encounter bottom trawls, but are not captured. A new approach to predicting the delayed mortality of crab uses a reflex action mortality predictor (RAMP) model to establish a relationship between mortality and reflex impairments. A 2007 pilot study of 649 crab established RAMP curves for both Tanner crab ( Chionoecetes bairdi ) and snow crab ( C. opilio ). Additional data (1775 crab) collected in 2008 allowed us to update the existing RAMP curves to more fully examine the effect of injury scores on the RAMP models and to determine the best method for estimating overall mortality. Results confirmed that the additional measurements did not significantly alter the original relationship between mortality and reflex impairment score. Additionally, the RAMP curves were used to predict unobserved mortality from observed reflex impairment scores of Chionoecetes spp. captured after encounters with different parts of bottom trawl gear (footrope and sweep) and alternative types of footrope and sweep. In addition to estimating mortality rates caused by each gear part, we tested whether the alternative footrope and sweep designs reduced the unobserved mortality rates of crab. Results showed that the alternative footrope (58 cm disk footrope) reduced mortality from 11.4 to 7.2% for Tanner crab and from 9.7 to 5.0% for snow crab . The alternative (off-bottom) sweep reduced mortality from 4.1 to 1.0% for Tanner crab and from 4.9 to 0.0% for snow crab. Thus, the use of the reflex impairment score through the RAMP model is a cost effective way to estimate delayed mortality and to assess the effect of ... |
format |
Text |
author |
Hammond, Carwyn F. Conquest, Loveday L. Rose, Craig S. |
author_facet |
Hammond, Carwyn F. Conquest, Loveday L. Rose, Craig S. |
author_sort |
Hammond, Carwyn F. |
title |
Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio) |
title_short |
Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio) |
title_full |
Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio) |
title_fullStr |
Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio) |
title_full_unstemmed |
Using reflex action mortality predictors (RAMP) to evaluate if trawl gear modifications reduce the unobserved mortality of Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio) |
title_sort |
using reflex action mortality predictors (ramp) to evaluate if trawl gear modifications reduce the unobserved mortality of tanner crab (chionoecetes bairdi) and snow crab (c. opilio) |
publisher |
Oxford University Press |
publishDate |
2013 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/70/7/1308 https://doi.org/10.1093/icesjms/fst085 |
long_lat |
ENVELOPE(-38.305,-38.305,-53.990,-53.990) |
geographic |
Bering Sea The Ramp |
geographic_facet |
Bering Sea The Ramp |
genre |
Bering Sea Snow crab Chionoecetes bairdi Tanner crab |
genre_facet |
Bering Sea Snow crab Chionoecetes bairdi Tanner crab |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/70/7/1308 http://dx.doi.org/10.1093/icesjms/fst085 |
op_rights |
Copyright (C) 2013, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fst085 |
container_title |
ICES Journal of Marine Science |
container_volume |
70 |
container_issue |
7 |
container_start_page |
1308 |
op_container_end_page |
1318 |
_version_ |
1766378228846428160 |