Comparative Study on Annual Fishery Production of Stationary Fishery on Ulleungdo Coast

Abstract

The fishery production volume of the stationary fishery on the coast of Ulleungdo from April to June of 2017 and 2020 was compared by fishing period. During this study, the total species individual and body weight were 2,735 inds. and 994.6kg in 2017, 1,854 inds. and 990.7kg were caught in 2020, which resulted in high production in 2017. In 2017, the fish caught were 9 orders and 21 species including rajiformmes and lophiformes, and 3 orders and 31 species including zeiformes in 2020. The number of taxa caught was high in 2017, and the number of species was high in 2020. Total wet weight was high in teuthida in 2017, and perciformes and tetraodoniformes were high in 2020. In 2017, the mean number of fish by species was dominated by Trachurus japonicus and Loigo chinesis, and in 2020, T. Japonicus and Takifugu stictonotus were mainly caught. The dominant organisms based on wet weight were found to be high in T. Japonicus and Seriola quinqueradiata in 2017, and S. quinqueradiata and Paralichthys olivaceus in 2020. The dominant organisms calculated based on the individuals during the study were analyzed to have 43.7% of T. Japonicus and 34.4% of L. chinesis in 2017, and 53.1% of T. Japonicus and 12.7% of T. stictonotus in 2020. The dominant species based on wet weight S. quinqueradiate 24.6% and L. chinesis 24.3% in 2017, and S. quinqueradiate 47.3% and P. olivaceus 11.6% in 2020. Among the dominant species, T. japonicus was the largest in production in 2017 and 2020. However, wet weight had the highest dominance of the large-sized species of S. quincueradiate and large individuals of L. chinesis were caught in 2017. In the case of L. chinesis, it is a species that mainly appears in low water temperature form December to February of the following year on the coast of Ulleundgo, and was caught in large quantities in April 2017. This phenomenon was judged to have formed a colony of this species due to the creation of a low-temperature environment around the fishing gear during this period. However, S. quinqueradiate and P. olivaceus were found to have a high weight in 2020 and both species were relatively high in open water or deep water in order to find sufficient food intake and spawning sites from April to May. It is interpreted that the spawning ground has moved to a well-established coastal area(PE99913).