From 2019 to 2020, researchers from the Yangtze River Fisheries Research Institute of the Chinese Academy of Fishery Sciences carried out the”Investigation of Fishery Resources and Environment in the Yangtze River Basin” and the”Poyang Lake Coilia The “Spawning Ground Investigation and Protection Research” project research found that after the implementation of protective measures such as the cancellation of the Yangtze River estuary concession fishing and the ban on fishing in the protected area, the resources of the migratory coilia in Poyang Lake have been significantly restored. On January 27, 2021, the relevant research results will be published online in the”Chinese Fishery Science” in the form of a paper (https://kns.cnki.net/kcms/detail/11.3446.S.20210127.1312.002.html).
Coilia sapiens is an important economic fish in the middle and lower reaches of the Yangtze River. It has two ecological phenotypes:freshwater settlement and anadromous migration. Freshwater-settled Coilia vulgaris can complete the entire life history in freshwater. The upstream migratory coilia spp. has a high economic value. It grows fattened in seawater and reproduces in freshwater. Generally, it enters freshwater from the sea in spring and traces up the Yangtze River estuary to the middle and lower reaches of the Yangtze River and the attached lakes to spawn and reproduce. Historically, Poyang Lake was an important spawning ground. Since the 1990s, due to wading activities such as overfishing and sand mining, the resources of Coilia sapiens in Poyang Lake have dropped sharply, and fishing floods have been unable to form. In some years, the catch has been”extinct”. According to the literature data of recent surveys and the results of this study, from 2010 to 2014, the average single boat catch of Coilia spp. was 1.6 ind./d; from 2017 to 2018, it dropped to 0.15 ind/d; starting in 2019, There is a clear trend of recovery of Coilia sapiens resources. In 2019, the single-boat fishing volume increased to 12.4 ind/d, and in 2020 it surged to 117 ind/d. The coilia spp. resources in Poyang Lake began to recover significantly.