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Towards sustainable fisheries of the Oresund cod (Gadus morhua) through sub-stock-specific assessment and management recommendations

Lindegren, Martin; Waldo, Staffan; Nilsson, Anders LU ; Svedang, Henrik and Persson, Anders LU (2013) In ICES Journal of Marine Science 70(6). p.1140-1150
Abstract
Fisheries management traditionally relies on stock assessments assuming discrete populations within large administrational areas. However, failing to account for sub-stock structuring may result in overestimation of the stocks' true harvest potential and unsustainable exploitation of small stock elements. Atlantic cod (Gadus morhua) frequently occurs in spatially segregated populations, some of which exhibit fine-scaled stock structuring within current management boundaries. Here we use the locally spawning cod stock in the Sound ("Oresund") as a case study, and perform a sub-stock-specific assessment to evaluate biological and economic effects of managing the Sound cod as a separate stock. Our results indicate that reducing exploitation... (More)
Fisheries management traditionally relies on stock assessments assuming discrete populations within large administrational areas. However, failing to account for sub-stock structuring may result in overestimation of the stocks' true harvest potential and unsustainable exploitation of small stock elements. Atlantic cod (Gadus morhua) frequently occurs in spatially segregated populations, some of which exhibit fine-scaled stock structuring within current management boundaries. Here we use the locally spawning cod stock in the Sound ("Oresund") as a case study, and perform a sub-stock-specific assessment to evaluate biological and economic effects of managing the Sound cod as a separate stock. Our results indicate that reducing exploitation pressure, particularly through technical regulations i. e. increasing gill-net mesh sizes, would not only enhance the stock age distribution, but yield long-term net benefits to the local gill-net fishery. Furthermore, our study emphasizes the need for developing sub-stock-specific management recommendations in order to ensure the maintenance of fisheries resources in general, and the persistence of sub-stock structuring in particular. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Atlantic cod, bio-economics, fisheries management, population, structuring, stock assessment, sub-stock-specific, technical regulations
in
ICES Journal of Marine Science
volume
70
issue
6
pages
1140 - 1150
publisher
Oxford University Press
external identifiers
  • wos:000323635600011
  • scopus:84883236810
ISSN
1095-9289
DOI
10.1093/icesjms/fst042
language
English
LU publication?
yes
id
184c174b-f08f-4320-b0c9-6665b6c2f3cc (old id 4062810)
date added to LUP
2013-10-21 11:39:40
date last changed
2019-07-09 01:01:09
@article{184c174b-f08f-4320-b0c9-6665b6c2f3cc,
  abstract     = {Fisheries management traditionally relies on stock assessments assuming discrete populations within large administrational areas. However, failing to account for sub-stock structuring may result in overestimation of the stocks' true harvest potential and unsustainable exploitation of small stock elements. Atlantic cod (Gadus morhua) frequently occurs in spatially segregated populations, some of which exhibit fine-scaled stock structuring within current management boundaries. Here we use the locally spawning cod stock in the Sound ("Oresund") as a case study, and perform a sub-stock-specific assessment to evaluate biological and economic effects of managing the Sound cod as a separate stock. Our results indicate that reducing exploitation pressure, particularly through technical regulations i. e. increasing gill-net mesh sizes, would not only enhance the stock age distribution, but yield long-term net benefits to the local gill-net fishery. Furthermore, our study emphasizes the need for developing sub-stock-specific management recommendations in order to ensure the maintenance of fisheries resources in general, and the persistence of sub-stock structuring in particular.},
  author       = {Lindegren, Martin and Waldo, Staffan and Nilsson, Anders and Svedang, Henrik and Persson, Anders},
  issn         = {1095-9289},
  keyword      = {Atlantic cod,bio-economics,fisheries management,population,structuring,stock assessment,sub-stock-specific,technical regulations},
  language     = {eng},
  number       = {6},
  pages        = {1140--1150},
  publisher    = {Oxford University Press},
  series       = {ICES Journal of Marine Science},
  title        = {Towards sustainable fisheries of the Oresund cod (Gadus morhua) through sub-stock-specific assessment and management recommendations},
  url          = {http://dx.doi.org/10.1093/icesjms/fst042},
  volume       = {70},
  year         = {2013},
}