Free Content Evaluating tuna management in the eastern Pacific Ocean

 Download
(PDF 126.5kb)
 
Download Article:

Abstract:

We answer four questions about tuna management in the eastern Pacific Ocean: What are the management objectives? Are they reasonable? Can we determine whether they have been achieved? Have they been achieved? There are explicit, over-arching management objectives including keeping populations at levels that will permit maximum sustainable yields, consideration of the precautionary approach, and consideration of ecosystem consequences, but although reasonable, these objectives are vague from a stock-assessment perspective. Objectives of individual participants are unlikely to be the same and collectively make achieving the overarching objectives more difficult. For data-rich stocks, we can determine whether the yield-based objectives have been achieved, but even these results have alternative interpretations. Unfortunately, when data are limited, the management objectives cannot be evaluated. In the eastern Pacific, species differ in achievement of objectives. Yield-based objectives are probably being achieved for yellowfin tuna—yields may increase if effort is reallocated among fishing methods—whereas for bigeye tuna, biomass levels are falling below that necessary for maximum sustainable yield. For skipjack, although the population level is healthy, restrictions designed to protect bigeye and yellowfin tuna prevent fishermen from achieving maximum sustainable yield. By-catch of other species in the tuna fisheries is a management concern.

Document Type: Research Article

Publication date: May 1, 2006

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more