Population dynamics of fisheries: Difference between revisions

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This [[logistic function|logistic]] model of growth is produced by a population introduced to a new habitat or with very poor numbers going through a lag phase of slow growth at first. Once it reaches a foothold population it will go through a rapid growth rate that will start to level off once the species approaches carrying capacity. The idea of maximum sustained yield is to decrease population density to the point of highest growth rate possible. This changes the number of the population, but the new number can be maintained indefinitely, ideally.
 
MSY is extensively used for fisheries management.<ref>{{cite web|author=WWF Publications|first=|date=2007|title=The Maximum Sustainable Yield objective in Fisheries|url=httphttps://awsassetswww.pandasciencedirect.orgcom/downloadstopics/wwf_msy_oct2011_final.pdfagricultural-and-biological-sciences/maximum-sustainable-yield|url-status=live|archive-url=|archive-date=|access-date=|website=}}{{dead link|date=February 2021|bot=Dlmarial|fix-attempted=yes}}
</ref><ref>{{cite web |author=New Zealand Ministry of Fisheries |url=http://www.fish.govt.nz/en-nz/SOF/Indicators.htm |title=MSY Harvest Strategies }}</ref> Unlike the logistic (Schaefer) model, MSY in most modern fisheries models occurs at around 30-40% of the unexploited population size.<ref>See e.g. {{cite journal |last1=Thorpe |first1=Robert B. |first2=Will J. F. |last2=Le Quesne |first3=Fay |last3=Luxford |first4=Jeremy S. |last4=Collie |first5=Simon |last5=Jennings |display-authors=1 |year=2015 |title=Evaluation and management implications of uncertainty in a multispecies size-structured model of population and community responses to fishing |journal=Methods in Ecology and Evolution |volume=6 |issue=1 |pages=49–58 |doi=10.1111/2041-210X.12292 |pmid=25866615 |pmc=4390044 }}</ref> This fraction differs among populations depending on the life history of the species and the age-specific selectivity of the fishing method.