Factors Influencing the Assessment of Albacore Tuna Resources in the Indian Ocean

Authors:Santiago Arrizabalaga, Zhuo Li

Abstract


Several models have been used for resource assessment of Thunnus alalunga, but the assessment results of these models are uncertain. Therefore, this paper analyzes the factors affecting resource assessment of Thunnus alalonga. The analysis results show the following results: (1) The quality of catch volume, body length composition or age composition data of the Indian Ocean albacore tuna fishery is affected by unreported, unreported or misreported fishery data, too low sample number and changes in sampling protocol, etc. (2) Although the catch per unit effort (CPUE) was standardized, the quality of standardized CPUE data was still seriously affected by the change of target species and spatial distribution of catch effort. (3) Studies on population ecology and reproductive biology of albacore tuna in the Indian Ocean are still relatively weak, and information on population structure, reproduction, growth and natural death is relatively lacking. In resource assessment, relevant parameter Settings need to be borrowed from the research results of other ocean regions. (4) The Marine environment has a significant impact on the resource change and spatial distribution of albacore tuna in the Indian Ocean, but the assessment model seldom considers the impact of Marine environment. Due to the above problems, the current assessment results are uncertain. In the future, we should continue to explore ways to improve the quality of resource assessment and establish a management strategy evaluation framework to avoid the impact of the uncertainty of fishery resource assessment results on the sustainable development of the fishery.


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