Abstract:By adopting FVCOM-simulated 3-D physical field and based on the biological processes of chub mackerel (Scomber japonicus) in its early life history from the individual-based biological model,the individual-based ecological model for chub mackerel at its early transport dynamics in the Yellow Sea was constructed through coupling the physical field from April to August with the biological model by the method of Lagrange particle tracking.The results showed that the model can accurately simulate the transport path、density and retention distribution of eggs and larvae of chub mackerel in the spawning ground in Qingdao Shidao offshore in the Yellow Sea.The study found that under average climate conditions, chub mackerelin the spawning ground in Qingdao Shidao offshore was overall transported to the southern part of Shandong Peninsula after spawning, eggs and larvae of chub mackerel were finally distributed in the range of 32°N-37°N and 121°E-124°E,and had a large distribution in the waters of the provisional measures of the China-Korea Fisheries Agreement(hereinafter referred to as the waters of the Agreement). Since spawning in April, some eggs and larvae of chub mackerel have begun to enter the waters of the Agreement, and from July to August, 50% of the super-individuals have entered the 40-80 m isobath in the waters of the Agreement and have been stranded for more than 300 hours, illustrating the spawning ground in Qingdao Shidao offshore contributes significantly to the replenishment of chub mackerel resources in the waters of the Agreement.The biopatch density and retention area of eggs and larvae of chub mackerel were mainly concentrated in the sea area of 33.5°N-37.5°N and 121°E-124.5°E, and this sea area was determined to be the main fattening ground for larvae of chub mackerel in the Yellow Sea, and 3/5 of the fattening ground was in the waters of the Agreement, indicating that the physical environment of the waters of the Agreement had a great impact on the replenishment of chub mackerel resources in the spawning ground in Qingdao Shidao offshore. There were obvious differences in the transport distribution of eggs and larvae of chub mackerel in different years, and the main dynamic reason for the interannual difference in the transport distribution of chub mackerel in the Yellow Sea is the location of the cold center of the Yellow Sea Cold Water Mass.
