황해 및 동중국해 참조기, Larimichthys polyactis 자원의 장기변동
Long-term changes in the small yellow croaker, Larimichthys polyactis, population in the Yellow and East China Seas
2
조회
0
다운로드
13
인용
0
참고문헌
키워드
초록
The population of small yellow croaker, Larimichthys polyactis, in the Yellow and East China Seas has decreased significantly since the mid 1970s. Several management measures have been introduced to conserve it, but population size remains low. To rebuild this population, it is now necessary to consider more effective management methods based on the stock assessment. To determine long-term population changes, fishery and biological data collected over 34 years (1969－2002) were nalysed. Yearly fish length compositions were analysed for the time periods 1968 through 1970, 1978 through 1982, and 1993 through 2002; and catch data was available from 1969 to 2002. Annual population sizes were calculated based on length composition, the relationship between total length and body weight, and total landings. Analyses showed that since the 1970s, average size of harvested fish decreased; the proportion of less mature fish (smaller than the 50% maturity length, 19cm) in catches has increased and the estimated biomass has decreased significantly. Consequently, the main management recommendation is that juvenile fish need to be better protected to allow the rebuilding of resources to a more sustainable population level. This will require fish size limit, permissible mesh size, and closed area and season regulations.
Abstract
The population of small yellow croaker, Larimichthys polyactis, in the Yellow and East China Seas has decreased significantly since the mid 1970s. Several management measures have been introduced to conserve it, but population size remains low. To rebuild this population, it is now necessary to consider more effective management methods based on the stock assessment. To determine long-term population changes, fishery and biological data collected over 34 years (1969－2002) were nalysed. Yearly fish length compositions were analysed for the time periods 1968 through 1970, 1978 through 1982, and 1993 through 2002; and catch data was available from 1969 to 2002. Annual population sizes were calculated based on length composition, the relationship between total length and body weight, and total landings. Analyses showed that since the 1970s, average size of harvested fish decreased; the proportion of less mature fish (smaller than the 50% maturity length, 19cm) in catches has increased and the estimated biomass has decreased significantly. Consequently, the main management recommendation is that juvenile fish need to be better protected to allow the rebuilding of resources to a more sustainable population level. This will require fish size limit, permissible mesh size, and closed area and season regulations.
참고문헌 (15)
- FAO, "Fisheries management. 2. The ecosystem approach to fisheries. FAO Tech. Guidelines for Responsible Fisheries 4. Suppl. 2", 112~ (2003)
- Ikeda, I., "Estimation on the fishery biology of the yellow croaker in the East China Sea and the Yellow Sea", Bull. Seikai Reg. Fish. Res. Lab. Lab, 31, pp.49~81 (1964)
- The use of length composition data in fish stock assessments (with notes on VPA and cohort analysis), "Jones, R.", 60~, pp.FAO fisheries circular No. 734 (1981)
- Assessing the effects of changes in exploitation pattern using length composition data, "Jones, R.", 118~, pp.FAO fish. tech. paper 256 (1984)
- Kim, Y.M., "Dynamical study on effective method of the stock management of Yellow cracker, Pseudosciaena manchurica (JORDAN et THOMPSON), in the East China Sea and Yellow Sea", Nat’l. Fish. Res. Dev. Institute, 16, pp.33~50 (1977)
- Assessment of fisheries resources and fishery management in Korean waters, "Kim, Y.M.", NFRDI, Sinheung Publish Company, 181~, pp.Fish. Res. Report, 12 (1993)
- Lee, J.U., "Estimation of age composition and survival rate of the Yellow croaker, Pseudosciaena manchurica JORDAN et THOMPSON, in the Yellow Sea and the East China Sea", Nat’l. Fish. Res. Dev. Institute, 16, pp.7~31 (1977)
- NFRDI, "Ecosystem and fishing grounds of commercially important species in Korean Waters", pp.383~ (2005), Yemunsa
- Myers, R.A., "Rapid worldwide depletion of predatory fish communities", Nature, 423, pp.280~283 (2003)
- Otaki, H., "On the reduction of distributional area of the yellow croaker resulting from decrease of abundance", Bull. Seikai Reg. Fish. Res. Lab, 51, pp.111~122 (1978)
- Yeon, I.J., "Changes in distribution area on the stock fluctuation of yellow croaker, Pseudosciaena polyactis Bleeker", Nat′l. Fish. Res. Dev. Institute, 45, pp.85~100 (1991)
- Zhang, C.I., "Estimation of population ecological characteristics of small yellow croaker, Pseudosciaena polyactis off Korea", Bull. Kor. Fish. Soc, 25, pp.29~36 (1992)
- Zhang, C.I., "A study on fluctuation in biomass of small yellow croaker, Pseudosciaena polyactis off Korea", Bull. Kor. Fish. Soc, 25, pp.37~44 (1992)
- Zhang, C.I., "Stock assessment and management implication of small yellow croaker in Korean waters", Bull. Kor. Fish. Soc, 25, pp.282~290 (1992)
- Zhang, C.I., "An ecosystem-based fisheries assessment approach for Korean fisheries", Fish. Res, 100, pp.26~41 (2009)