Impacts of demographic variation in spawning characteristics on reference points for fishery management
Parametric relationships of recruitment to an index of parental stock size assume the latter is proportionally related to spawning potential, irrespective of the demographic composition of adults. Recent empirical information, however, suggests that reproduction by older and experienced females is m...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
2001
|
Subjects: | |
Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/58/5/1002 https://doi.org/10.1006/jmsc.2001.1097 |
id |
fthighwire:oai:open-archive.highwire.org:icesjms:58/5/1002 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:icesjms:58/5/1002 2023-05-15T15:27:50+02:00 Impacts of demographic variation in spawning characteristics on reference points for fishery management Murawski, S. A. Rago, P. J. Trippel, E. A. 2001-01-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/58/5/1002 https://doi.org/10.1006/jmsc.2001.1097 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/58/5/1002 http://dx.doi.org/10.1006/jmsc.2001.1097 Copyright (C) 2001, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Regular Articles TEXT 2001 fthighwire https://doi.org/10.1006/jmsc.2001.1097 2013-05-27T04:12:43Z Parametric relationships of recruitment to an index of parental stock size assume the latter is proportionally related to spawning potential, irrespective of the demographic composition of adults. Recent empirical information, however, suggests that reproduction by older and experienced females is more successful than by young and inexperienced females. New models are developed incorporating the proportion of each age group spawning for the first, second, etc., time (from information contained in the maturity ogive) and differences in the survival of eggs and larvae in relation to the demography of spawners (based on experimental results). A series of spawning metrics [spawning-stock biomass (SSB), egg production, hatched egg production, viable larval production] and associated recruitment-based fishing mortality reference points (F med , F crash , and the F that allows at least one lifetime spawning per recruit) are contrasted for the Georges Bank Atlantic cod ( Gadus morhua ) stock. The time-series of spawning intensity is significantly altered when hatched eggs or viable larvae are used as the metric, reflecting the contribution of first- and second-time spawners in some years, and the increasing trend in F. The effect of reduced average maternal size in relation to egg viability was a more important factor contributing to discrepancies with SSB than was spawning experience in relation to hatching success. Percent maximum spawning potential (%MSP) per recruit curves in relation to F are steeper (i.e. result in lower values of %MSP for a given F) for hatched eggs and viable larvae than for SSB or egg production per recruit. Lifetime expected numbers of spawnings per recruit are significantly reduced when the effects of spawning experience on egg hatching success are included. And finally, although point estimates of F med and F crash are similar using SSB and viable larval production, the median F crash estimated from 5000 bootstrap realizations of the Beverton-Holt stock recruitment curve for viable larvae is ... Text atlantic cod Gadus morhua HighWire Press (Stanford University) ICES Journal of Marine Science 58 5 1002 1014 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Regular Articles |
spellingShingle |
Regular Articles Murawski, S. A. Rago, P. J. Trippel, E. A. Impacts of demographic variation in spawning characteristics on reference points for fishery management |
topic_facet |
Regular Articles |
description |
Parametric relationships of recruitment to an index of parental stock size assume the latter is proportionally related to spawning potential, irrespective of the demographic composition of adults. Recent empirical information, however, suggests that reproduction by older and experienced females is more successful than by young and inexperienced females. New models are developed incorporating the proportion of each age group spawning for the first, second, etc., time (from information contained in the maturity ogive) and differences in the survival of eggs and larvae in relation to the demography of spawners (based on experimental results). A series of spawning metrics [spawning-stock biomass (SSB), egg production, hatched egg production, viable larval production] and associated recruitment-based fishing mortality reference points (F med , F crash , and the F that allows at least one lifetime spawning per recruit) are contrasted for the Georges Bank Atlantic cod ( Gadus morhua ) stock. The time-series of spawning intensity is significantly altered when hatched eggs or viable larvae are used as the metric, reflecting the contribution of first- and second-time spawners in some years, and the increasing trend in F. The effect of reduced average maternal size in relation to egg viability was a more important factor contributing to discrepancies with SSB than was spawning experience in relation to hatching success. Percent maximum spawning potential (%MSP) per recruit curves in relation to F are steeper (i.e. result in lower values of %MSP for a given F) for hatched eggs and viable larvae than for SSB or egg production per recruit. Lifetime expected numbers of spawnings per recruit are significantly reduced when the effects of spawning experience on egg hatching success are included. And finally, although point estimates of F med and F crash are similar using SSB and viable larval production, the median F crash estimated from 5000 bootstrap realizations of the Beverton-Holt stock recruitment curve for viable larvae is ... |
format |
Text |
author |
Murawski, S. A. Rago, P. J. Trippel, E. A. |
author_facet |
Murawski, S. A. Rago, P. J. Trippel, E. A. |
author_sort |
Murawski, S. A. |
title |
Impacts of demographic variation in spawning characteristics on reference points for fishery management |
title_short |
Impacts of demographic variation in spawning characteristics on reference points for fishery management |
title_full |
Impacts of demographic variation in spawning characteristics on reference points for fishery management |
title_fullStr |
Impacts of demographic variation in spawning characteristics on reference points for fishery management |
title_full_unstemmed |
Impacts of demographic variation in spawning characteristics on reference points for fishery management |
title_sort |
impacts of demographic variation in spawning characteristics on reference points for fishery management |
publisher |
Oxford University Press |
publishDate |
2001 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/58/5/1002 https://doi.org/10.1006/jmsc.2001.1097 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/58/5/1002 http://dx.doi.org/10.1006/jmsc.2001.1097 |
op_rights |
Copyright (C) 2001, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1006/jmsc.2001.1097 |
container_title |
ICES Journal of Marine Science |
container_volume |
58 |
container_issue |
5 |
container_start_page |
1002 |
op_container_end_page |
1014 |
_version_ |
1766358235026030592 |