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| Assessment for Japanese Scad Decapterus maruadsi Fishery in Offshore Waters of Southern Zhejiang Based on Per Recruitment Model |
| CUI Mingyuan1, TIAN Siquan1,2,3,4, MA Qiuyun1,2,3,4, FAN Qingsong5 |
1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;
2. National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China;
3. The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China;
4. Key Laboratory of Oceanic Fisheries Exploitation, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China;
5. Zhejiang Mariculture Research Institute, Wenzhou 325000, China |
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Abstract The objective of this study was to assess the fishery and to provide biological reference points for the fisheries management of Japanese scad Decapterus maruadsi in the East China Sea. Specifically, we analyzed the life history traits and conducted the yield per recruitment (YPR) model and spawning stock biomass per recruitment (SSBR) model for Japanese scad. Through the scientific survey in offshore waters of Southern Zhejiang from 2015 to 2018, Japanese scad were collected and measured for the body length (cm) and body weight (g). The asymptotic length L∞ was estimated to be 26.00 cm by ELEFAN Ⅰ method, with the exponential rate of 0.19/a. Based on the length-converted catch curve, total mortality Z was estimated to be 1.41. The natural mortality M was found to be 0.55 estimated by Pauly empirical formula, according to the above growth parameters and the water temperature. Therefore, the fishing mortality F was 0.86. Based on all above estimates for life history parameters, the yield per recruitment and spawning stock biomass per recruitment models were projected for Japanese scad. The biological reference points Fmax and F0.1 were 3.602 and 0.596, respectively. The values of F20% and F40% were 0.421 and 0.220, respectively estimated from spawning stock biomass per recruitment model. The current fishing intensity is far greater than the warning line to prevent supplementary overfishing (F20%). Different M (0.35, 0.45, 0.55, 0.65, 0.75, and 0.85) and different fork length of first capture (11.21 cm, 11.87 cm, 12.76 cm, 14.00 cm, and 15.83 cm) were considered in the sensitivity analysis of yield per recruitment and spawning stock biomass per recruitment models. When M was increased from 0.35 to 0.85, the estimates for the current yield per recruitment and the current spawning stock biomass per recruitment were reduced by 10.29 and 0.79, respectively. Fork length of inflecting point was 17.79 cm, critical fork length was 13.58 cm, and the current catchable size (12.76 cm) was much smaller than the fork length of first sexual maturity, which indicates that the current fishing pressure is too heavy. Although Japanese scad in offshore waters of southern Zhejiang has not been in growth over fishing (F0.1<Fcurrent<Fmax), it is subject to recruitment over fishing. Improvements about the natural mortality and selectivity estimates are essential to enhance the stock assessment and fishery management for the Japanese scad fishery, which suffered great fishing pressure. Additionally, the fishing effort is suggested to be decreased with more conservative management measures in order to keep the sustainable development for this fishery.
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Received: 07 December 2020
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