So what should a natural mortality curve look like for oysters?

Natural mortality rate (M) of a population describes the interaction of recruitment, growth and loss to environmental factors (both physical and biological). It reflects species life history traits, a product of selection over evolutionary time scales. Fishing mortality (F) describes loss to exploit...

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Bibliographic Details
Main Authors: Mann, R.M., Walles, B., Troost, K.
Format: Article in Journal/Newspaper
Language:English
Published: National Shellfisheries Association 2012
Subjects:
Online Access:https://research.wur.nl/en/publications/so-what-should-a-natural-mortality-curve-look-like-for-oysters
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record_format openpolar
spelling ftunivwagenin:oai:library.wur.nl:wurpubs/444729 2024-02-11T10:03:11+01:00 So what should a natural mortality curve look like for oysters? Mann, R.M. Walles, B. Troost, K. 2012 https://research.wur.nl/en/publications/so-what-should-a-natural-mortality-curve-look-like-for-oysters en eng National Shellfisheries Association https://research.wur.nl/en/publications/so-what-should-a-natural-mortality-curve-look-like-for-oysters Wageningen University & Research 104th Anual Meeting, National Shellfisheries Association, Seattle, Washington, March 24–29, 2012 Life Science Article in monograph or in proceedings 2012 ftunivwagenin 2024-01-24T23:19:04Z Natural mortality rate (M) of a population describes the interaction of recruitment, growth and loss to environmental factors (both physical and biological). It reflects species life history traits, a product of selection over evolutionary time scales. Fishing mortality (F) describes loss to exploitation. Estimates of natural mortality in extant oyster populations arguably diverge fromthese evolved norms because of cumulative impacts of environmental degradation, age truncation by disease, and fishing. Pre-1900 literature describes very large oysters that, extrapolating from truncated modern growth curves, are suggested to have terminal ages in the 15–20 year ranges. The lengths of these oysters can be used with Hoenig plots to estimate natural mortality in preexploitation, pre-disease situations. A Hoenig plot inherently suggests a constant mortality rate with increasing age, but is this correct for oysters? We describe a length frequency distribution for an unexploited population of Crassostrea gigas, currently invading the Oosterschelde in the Netherlands, that includes representation of all size classes up to 200mm in length – an analog of a preexploitation, pre-disease population. From this demographic we suggest a probabilistic age structure and estimate age specific mortality for a long-lived, undisturbed oyster population. Article in Journal/Newspaper Crassostrea gigas Wageningen UR (University & Research Centre): Digital Library
institution Open Polar
collection Wageningen UR (University & Research Centre): Digital Library
op_collection_id ftunivwagenin
language English
topic Life Science
spellingShingle Life Science
Mann, R.M.
Walles, B.
Troost, K.
So what should a natural mortality curve look like for oysters?
topic_facet Life Science
description Natural mortality rate (M) of a population describes the interaction of recruitment, growth and loss to environmental factors (both physical and biological). It reflects species life history traits, a product of selection over evolutionary time scales. Fishing mortality (F) describes loss to exploitation. Estimates of natural mortality in extant oyster populations arguably diverge fromthese evolved norms because of cumulative impacts of environmental degradation, age truncation by disease, and fishing. Pre-1900 literature describes very large oysters that, extrapolating from truncated modern growth curves, are suggested to have terminal ages in the 15–20 year ranges. The lengths of these oysters can be used with Hoenig plots to estimate natural mortality in preexploitation, pre-disease situations. A Hoenig plot inherently suggests a constant mortality rate with increasing age, but is this correct for oysters? We describe a length frequency distribution for an unexploited population of Crassostrea gigas, currently invading the Oosterschelde in the Netherlands, that includes representation of all size classes up to 200mm in length – an analog of a preexploitation, pre-disease population. From this demographic we suggest a probabilistic age structure and estimate age specific mortality for a long-lived, undisturbed oyster population.
format Article in Journal/Newspaper
author Mann, R.M.
Walles, B.
Troost, K.
author_facet Mann, R.M.
Walles, B.
Troost, K.
author_sort Mann, R.M.
title So what should a natural mortality curve look like for oysters?
title_short So what should a natural mortality curve look like for oysters?
title_full So what should a natural mortality curve look like for oysters?
title_fullStr So what should a natural mortality curve look like for oysters?
title_full_unstemmed So what should a natural mortality curve look like for oysters?
title_sort so what should a natural mortality curve look like for oysters?
publisher National Shellfisheries Association
publishDate 2012
url https://research.wur.nl/en/publications/so-what-should-a-natural-mortality-curve-look-like-for-oysters
genre Crassostrea gigas
genre_facet Crassostrea gigas
op_source 104th Anual Meeting, National Shellfisheries Association, Seattle, Washington, March 24–29, 2012
op_relation https://research.wur.nl/en/publications/so-what-should-a-natural-mortality-curve-look-like-for-oysters
op_rights Wageningen University & Research
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