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Modeling Longline Effort Dynamics and Protected Species Interaction
2007 final progress report, FY
2006, FY 2005,
FY 2004, FY
While the ecosystem-based fishery management has recently been promoted as the preferred approach for sustainable fishery management, ecosystems modeling is still in its infancy. Although information required for ecosystem-based fishery management is highly scattered, it is clear that an interdisciplinary and learning-by-doing approach can be a precursor to this broad-based fishery management approach. One of the major components in any ecosystem model would be the depiction of the fishers' behavior in relation to their choice of effort levels, target species, fishing location, and entry into/exit out of a fishery. The behavioral aspects of fishers are generally embedded in a fleet dynamic model to derive the optimal fleet mix and effort levels spatially (by area) and temporally (by season) given the estimated amount of fishery resources under various management options and socio-economic conditions faced by the fishery.
A Hawaii fleet dynamic model earlier developed by then-PFRP researcher MinLing Pan provides optimal seasonal and spatial allocation of effort among different fleets as well as the trade-offs between recreational and commercial fisheries and impacts of area closure regime. This model, however, does not consider the plausible impacts of existing fishery management on the biodiversity of the ecosystem. Furthermore, this model was developed using a limited period of data and in a situation where the different kinds of fisheries were allowed to practice without much restriction. The derived optimal outcomes also did not consider interactions with major protected marine species, especially sea turtles. Under the present situation, if the longline fishery and related economic activity were to continue, protected species and other predator-prey relationships must constitute an integral part of the pelagic fishery management planning and implementation. The purpose of this proposed study is to refine and extend the existing Hawaii fleet dynamic model by incorporating the most current available information and up-to-date modeling platform for ease of applications. Project researchers will extend ongoing efforts by current PFRP researchers Xiulin Gu and Sam Pooley by including more pragmatic constraints into the fleet dynamics model.
Specific objectives and tasks are as follows:
Year 1 funding for this 2-year project to be awarded in November 2002.
Department of Economics
Department of Biosystems Engineering
University of Hawaii at Manoa
Honolulu, Hawaii 96822 USA
Phone (808) 956-7787
This page updated September 25, 2007