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Effect Evaluation of Summer Fishing Moratorium (SFM) in Daya Bay Based on Remote Sensing and Survey Data

Yu Jing  Hu Qiwei  Chen Pimao  Mang Qi  
【摘要】:[Objective] The paper was to quantitatively evaluate the maintenance effect of summer fishing moratorium(SFM) in Daya Bay. [Method]Based on satellite remote sensing and trawl surveys, the changes in sea surface temperature(SST), chlorophyll a(Chl-a) concentration, catch per unit effort(CPUE), biodiversity, species composition, body length and weight of total catch in Daya Bay before SFM(May 2015) and after SFM(August 2015) were comparatively analyzed. [Result] The CPUE of total catch mainly distributed from 0-10 kg/h before SFM to 0-40 kg/h after SFM. The average body length and weight of catches increased, indicating that the growth rate of catches was accelerated. The indices of Shannon-Wiener diversity index(H′) and Pielou evenness index(J′) increased by 0.36 and 0.14, respectively, indicating that the community structure was improved. The biomass spectra of fishery resources community suggested that the slopes of normalized biomass spectra after SFM was greater than -1, and the biomass of fishery resources increased with the increase of individual body weight after SFM. SFM reduced offshore fishing intensity,recovered and conserved the fishery resources in Daya Bay. [Conclusion] In order to improve the SFM system and promote the sustainable development of coastal fishery resources, it is suggested to prolong the time of SFM appropriately, reduce the number of coastal fishing boats, and strength-en the conservation of fish resources.

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