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Effects of lengths of catch time series on stock assessment using CMSY method
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Qi Li1, 3, Shude Liu2, Kun Wang1, 3, Chongliang Zhang1, 3, *
Haiyang Xuebao | 2023, 45(3) : 27 - 39
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Haiyang Xuebao | 2023, 45(3): 27-39
Article
Effects of lengths of catch time series on stock assessment using CMSY method
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Qi Li1, 3, Shude Liu2, Kun Wang1, 3, Chongliang Zhang1, 3, *
Affiliations
  • 1College of Fisheries, Ocean University of China, Qingdao 266003, China
  • 2Shandong Fisheries Development and Resources Conservation Center, Yantai 264003, China
  • 3Field Observation and Research Station of Haizhou Bay Fishery Ecosystem, Ministry of Education, Qingdao 266003, China
Published: 2023-03-01 doi: 10.12284/hyxb2023046
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The majority of global fish stocks lack adequate data for their stock statuses to be assessed using conventional stock assessment methods. Data-limited methods, such as CMSY, have been increasingly recommended as new solutions for stock assessment and fishery management. However, CMSY is highly dependent on data quality, and the reliability of the method is yet to be verified under circumstances of limited length of time series data and variable observational errors. In this study, we investigated effects of lengths of catch time series, stages of fishery development, and levels of observational errors in catches on stock assessment of three economically-important species in the Yellow Sea using CMSY method. The results show that chub mackerel (Scomber japonicus), hairtail (Trichiurus lepturus), and silver pomfret (Pampus argenteus), all have been overfished (B/BMSY<1 and F/FMSY>1), with their yields higher than estimated MSY since 2000, and although their fishing intensities have been reduced over the most recent decade, their biomasses remain at low levels (B/BMSY<1). The retrospective analysis show small differences in the results of stock assessment for the three species, indicating that the assessments are robust enough with long time series data. As to effects of lengths of catch time series, the assessments are more stable using time series data covering a period of both rise and fall in catches. The effect of observational errors in catches is also tested, showing that when the error is >20%, the model tend to overestimate MSY and BMSY, but the assessment remains robust enough. This study suggests that cautions should be undertaken in the application of CMSY by using longer time series of catch data and, in the presence of high uncertainty in the assessment, more conservative measures should be taken in fishery management.

data-limited methods  /  fishery stock assessment  /  CMSY method  /  fisheries yield  /  time series data
Qi Li, Shude Liu, Kun Wang, Chongliang Zhang. Effects of lengths of catch time series on stock assessment using CMSY method[J]. Haiyang Xuebao, 2023 , 45 (3) : 27 -39 . DOI: 10.12284/hyxb2023046
Year 2023 volume 45 Issue 3
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Article Info
doi: 10.12284/hyxb2023046
  • Receive Date:2022-09-04
  • Online Date:2025-12-26
  • Published:2023-03-01
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  • Received:2022-09-04
  • Revised:2022-10-11
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Affiliations
    1College of Fisheries, Ocean University of China, Qingdao 266003, China
    2Shandong Fisheries Development and Resources Conservation Center, Yantai 264003, China
    3Field Observation and Research Station of Haizhou Bay Fishery Ecosystem, Ministry of Education, Qingdao 266003, China
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表12种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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