Assessment of Biological Parameters and Yield per Recruit for HairtailTrichiurus japonicus in the Coastal Waters of Qingdao
ZHAO Yifeng1,2, YANG Shicheng1,2, ZHAO Tianya1,2, XU Binduo1,2, ZHANG Chongliang1,2, WANG Peng3, JI Yupeng1,2
1. College of Fisheries, Ocean University of China, Qingdao 266003, China; 2. Field Observation and Research Station of Haizhou Bay Fishery Ecosystem, Ministry of Education, Qingdao 266003, China; 3. Qingdao Marine Management Support Center, Qingdao 266000, China
Abstract：In order to understand biological parameters and resource status of hairtail Trichiurus japonicus in Qingdao coastal waters, the growth and mortality parameters were estimated using electronic length frequency analysis (ELEFAN) and length-converted catch curves (LCCC) based on anal length and body weight data from bottom trawl surveys conducted jn the coastal waters of Qingdao (N 35.3°—36.5°,E 119.5°—121.6°) in summer and autumn from 2018 to 2022. Yield-per-recruit (Y/R) models were developed to investigate the relationship between Y/R and fishing mortality F under different natural mortality M and anal lengths at first capture Lc. Results showed that the anal length of T. japonicus was ranged from 5.2 cm to 31.0 cm, and the body weight from 1.13 g to 245.98 g. The anal length-weight relationship was expressed as m= 0.011×L3.08(r2=0.85, b=3.08±0.06), with a positive allometric growth pattern. The asymptotic anal length L∞ was found to be 66.01 cm, growth coefficient to be K 0.20 a-1and total mortality Z to be 4.37 a-1. The average value of M was estimated to be 0.47 a-1 and exploitation rate E to be 0.89. Y/R models indicated that Y/R showed a trend of first increasing and then decreasing with increase in F. Under the current F value, Y/R decreased with the increase in M and increased with the increase in Lc, with biological reference points F0.1 of 0.32 a-1 and Fmaxof 0.54 a-1. The findings showed that T. japonicus was over-exploited. Reducing fishing pressure and increasing anal length at first capture were recommended to maintain the sustainability of T. japonicus resource.
赵艺丰, 杨仕诚, 赵天亚, 徐宾铎, 张崇良, 王鹏, 纪毓鹏. 青岛近海带鱼生物学参数和单位补充量渔获量评估[J]. 水产科学, 2026, 45(3): 395-404.
ZHAO Yifeng, YANG Shicheng, ZHAO Tianya, XU Binduo, ZHANG Chongliang, WANG Peng, JI Yupeng. Assessment of Biological Parameters and Yield per Recruit for HairtailTrichiurus japonicus in the Coastal Waters of Qingdao. Fisheries Science, 2026, 45(3): 395-404.
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2026, Vol. 45 
