期刊
MARINE AND FRESHWATER RESEARCH
卷 60, 期 12, 页码 1273-1284出版社
CSIRO PUBLISHING
DOI: 10.1071/MF09087
关键词
CPUE standardisation; environmental variables; generalised additive models; north-western Pacific Ocean; Ommastrephes bartramii
资金
- Program for New Century Excellent Talents in University [NCET-06-0437]
- Shanghai Leading Academic Discipline [S30702]
- Excellent Young Teacher Fund of Shanghai Education Commission
Spatial scale is an important factor that needs to be considered in data collection and analysis in ecological studies. Studies focusing on the quantitative evaluation of impacts of spatial scales are, however, limited in fisheries. Using the Chinese squid-jigging fishery in the north-western Pacific Ocean as an example, we evaluated impacts of spatial scale used in grouping fisheries and environmental data on the standardisation of fisheries catch per unit effort (CPUE). We developed 18 scenarios of different spatial scales with a combination of three latitudinal levels (0.5 degrees, 1 degrees and 2 degrees) and six longitudinal levels (0.5 degrees, 1 degrees, 2 degrees, 3 degrees, 4 degrees and 5 degrees) to aggregate the data. We then applied generalised additive models to analyse the 18 scenarios of data for the CPUE standardisation, and quantified differences among the scenarios. This study shows that longitudinal and latitudinal spatial scale and size of the spatial area for data aggregation can greatly influence the standardisation of CPUE. We recommend that similar studies be undertaken whenever possible to evaluate the roles of spatial scales and to identify the optimal spatial scale for data aggregations in the standardisation of CPUE and fisheries stock assessment.
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