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The concept of an optimum yield at intermediate levels of fishing (the so called maximum sustainable yield or MSY) has been with us since the 1930s and is now enshrined in legislation as a key objective of fisheries management. The concept seems intuitively reasonable and is readily applicable to a single stock treated in isolation and assuming a constant environment. However, translating this concept into a mixed and multispecies fishery, where there are complex trade-offs between fleets and stocks and in general no simple optimum solution, has been problematic. Here I introduce a framework for thinking about multispecies MSY in terms of an integrated risk of stock depletion and expected long-term yield. Within this framework I consider the performance of a set of simple harvest control rules based upon a single-limit fishing mortality rate (F) which is common to all stocks and a target biomass which is a set fraction of a stock's virgin biomass. Using a multispecies management strategy evaluation, I compare expected outcomes for a set of these harvest control rules with alternative scenarios, in which each stock has its own F based on the assessment process. I find that the simple framework can produce outcomes that are similar to those from the more sophisticated estimates of F. I therefore conclude that achieving multispecies MSY may depend more upon setting reasonable biomass targets and faithfully applying a harvest control rule approach rather than determining the best possible Fs for each stock.
This article was published in the following journal.
Name: Journal of fish biology
To investigate the effects of the ginsenoside Rh2 on monospecies and multispecies cariogenic biofilms and explore the mechanism of the antibiofilm effect of Rh2 in vitro.
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This study assesses the sustainability of impacts, 4 years post-program, from a pilot safety net program that was implemented from May 2012-April 2014. The intervention, called the Transfe...
Approximately 3000 advanced NSCLC patients, who fulfil the inclusion/exclusion criteria, will be recruited by 30 sites in North China.
A family of Urodela consisting of 15 living genera and about 42 species and occurring in North America, Europe, Asia, and North Africa.
State bounded on the north by Kentucky and Virginia, on the east by North Carolina, on the south by Georgia, Alabama and Mississippi, and on the west by Arkansas and Missouri.
Country in Northeastern Europe including Great Britain and the northern one-sixth of Ireland, located between the North Sea and north Atlantic Ocean. The capital is London.
An island in Northern North America, between the Arctic Ocean and the North Atlantic Ocean, northeast of Canada.
Individual members of North American ethnic groups with ancient historic ancestral origins in Asia.