Estimation of tuna fishing capacity from stock assessment related information.

Majkowski, J.;Fishery and Aquaculture Economics and Policy Division

Estimation of tuna fishing capacity from stock assessment related information.

Workshop to Further Develop, Test and Apply a Method for the Estimation of Tuna Fishing Capacity from Stock Assessment-related Information. La Jolla, California, United States of America, 14–16 May 2007.

Year of publication 2009

Author Majkowski, J.;Fishery and Aquaculture Economics and Policy Division

Product type Book (series)

ISBN 9789251064344

Series title FAO Fisheries Proceedings

Series number 2070-6103 - P16

Edition 1

Full item page

Synopsis (short abstract) These Proceedings include (i) the Report of and (ii) the paper presented at the Workshop to Further Develop, Test and Apply a Method for the Estimation of Tuna Fishing Capacity from Stock Assessment-Related Information. The Workshop was hosted by the Inter-American Tropical Tuna Commission (IATTC) in La Jolla, California, USA, from 14 to16 May 2007. It was organized by FAO’s Japan-funded Project on the “Management of Tuna Fishing Capacity: Conservation and Socio-Economics” in collaboration with and with in-kind support of several international and national fisheries institutions involved tuna fisheries research and management. The paper presented at the Workshop describes peak-to-peak (PP) and general additive modeling (GAM) approaches to estimate fishing capacity and related quantities from stock assessment information. The PP and GAM methods were applied to seven stocks of bigeye, yellowfin and skipjack tuna of the Pacific, Indian and Atlantic Oceans. The estimated trends in overca pacity with both methods were consistent across most of the stocks, showing increasing trends at the beginning of the time series and reaching maximum values during the late 1990s, followed by decreasing trends after that. For most of the stocks analyzed, overcapacity was positive during a part of the time series. Sensitivity tests revealed greater estimates of capacity output when the stock assessment data were most disaggregated. Further tests revealed that the estimates of overcapacity were l ower when low variability in effort deviations was permitted in the stock assessment. The Report of the Workshop outlines the discussions carried out at the Workshop, some proposals for further research, recommendations and conclusions of the Workshops.

Cite this content as:

Bayliff, W.H.; Majkowski, J. (eds.)Workshop to Further Develop, Test and Apply a Method for the Estimation of TunaFishing Capacity from Stock Assessment-related Information. La Jolla, California,United States of America, 14–16 May 2007.FAO Fisheries and Aquaculture Proceedings. No. 16. Rome, FAO. 2009. 51p.

Language English