Project 62: SEAPODYM applications in WCPO [EB WP 03] P. Lehodey ... [et al.]

By: Contributor(s): Material type: ArticleArticlePublication details: [Pohnpei, Federated States of Micronesia] Western and Central Pacific Fisheries Commission (WCPFC) 2013Description: 63 p. 30 cm. ill., graphs, maps, tablesSubject(s): DDC classification:
  • 639.27783
Online resources: Summary: "The SC is advised that the reference fits presented for skipjack, bigeye and south pacific albacore are currently the best available for each species. The biomass estimates however remain above those of MULTIFAN‐CL for skipjack and bigeye unless the mortality rates and initial biomass in SEAPODYM are scaled to those estimated by MULTIFAN‐CL. For albacore, the last optimization including improvements in both the fisheries definition and the code of the model resulted in a new unconstrained estimate with lower biomass than in the MFCL last assessment. The SC is encouraged to note that the use of finer resolution data has captured more meso‐scale variation in tuna distribution which is resulting in the convergence in population estimates between SEAPODYM and MULTIFAN‐CL. The SC should also be encouraged by the code developments to incorporate tagging data into the model. The first experiments with this code have resulted in improved estimation of movement parameters and early indications suggest that these data will result in lower biomass estimation and improvement in model fits. The SC is also advised that the model ensemble approach currently being applied to the construction of physical forcing data to be used in future climate change analyses will allow uncertainties in tuna responses to climate change to be better evaluated. The SC is requested to note the 2013‐2014 work plan for Project 62 which includes the generation of historical reference fits for all species with the inclusion of tagging data, further applications of high resolution data, and new analyses of climate change impacts. The SC is also requested to acknowledge the projects and donors that are continuing to contribute to the development and application of SEAPODYM to the work programme of the WCPFC‐SC and requested to endorse the inclusion of all presented projects within the scope of Project 62. The SC is also invited to note that development of the SEAPODYM model has now progressed to the stage where it can be used to assist the WCPFC and its committees with decisions associated with:  Developing criteria for the allocation of the total allowable catch or the total level of fishing effort;  Assessing the impacts of climate variability and change and fishing impacts;  Marine spatial planning and CMM evaluation; and  Providing fixed input into MFCL (e.g. recruitment and movement parameters). The SC is advised to schedule a scientific review of all historical and climate change reference fits (in the agenda of SC10) to facilitate the use of this model in the future work programs of WCPFC and its committees. The review should aim to determine which applications SEAPODYM reference fits are endorsed."
Item type: Meeting Paper
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Holdings
Current library Call number Status Date due Barcode
SPC Special Collections SPC 639.277 83 WES 2013 Available

"WCPFC-SC9-2013/EB-WP-03 Rev 1"

Not published by the SPC

Includes bibliographical references (p. 63)

"The SC is advised that the reference fits presented for skipjack, bigeye and south pacific albacore are currently the best available for each species. The biomass estimates however remain above those of MULTIFAN‐CL for skipjack and bigeye unless the mortality rates and initial biomass in SEAPODYM are scaled to those estimated by MULTIFAN‐CL. For albacore, the last optimization including improvements in both the fisheries definition and the code of the model resulted in a new unconstrained estimate with lower biomass than in the MFCL last assessment. The SC is encouraged to note that the use of finer resolution data has captured more meso‐scale variation in tuna distribution which is resulting in the convergence in population estimates between SEAPODYM and MULTIFAN‐CL. The SC should also be encouraged by the code developments to incorporate tagging data into the model. The first experiments with this code have resulted in improved estimation of movement parameters and early indications suggest that these data will result in lower biomass estimation and improvement in model fits. The SC is also advised that the model ensemble approach currently being applied to the construction of physical forcing data to be used in future climate change analyses will allow uncertainties in tuna responses to climate change to be better evaluated. The SC is requested to note the 2013‐2014 work plan for Project 62 which includes the generation of historical reference fits for all species with the inclusion of tagging data, further applications of high resolution data, and new analyses of climate change impacts. The SC is also requested to acknowledge the projects and donors that are continuing to contribute to the development and application of SEAPODYM to the work programme of the WCPFC‐SC and requested to endorse the inclusion of all presented projects within the scope of Project 62. The SC is also invited to note that development of the SEAPODYM model has now progressed to the stage where it can be used to assist the WCPFC and its committees with decisions associated with:  Developing criteria for the allocation of the total allowable catch or the total level of fishing effort;  Assessing the impacts of climate variability and change and fishing impacts;  Marine spatial planning and CMM evaluation; and  Providing fixed input into MFCL (e.g. recruitment and movement parameters). The SC is advised to schedule a scientific review of all historical and climate change reference fits (in the agenda of SC10) to facilitate the use of this model in the future work programs of WCPFC and its committees. The review should aim to determine which applications SEAPODYM reference fits are endorsed."