Study of the Impact of Climatic Change on Fishery Production at Coastal Areas in China
LIU Yunfen (Commission for Integrated Survey of Natural Resource, Chinese Academy of Sciences, Beijing 100101)
2000, 21(04):
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By making use of the introduced FISH BIOENERGETICS MODEL 2, a dynamic simulation was made of the growth of the main fish species in China’s fishery production (hairtail fish, large yellow croaker and little yellow croaker), and the potential effects of a rise in sea surface temperature caused by climatic change on fishery production was also discussed. Temperature is one of the fundamental and important factors in the living environment of aquatic living things. The sea fish are divided into cold water fish, warm water fish, lukewarm water fish and all temperature fish. the change in water temperature has a direct impact on the growing, feeding, spawning, migration, death of the fish and its population change, which, in the end, will affect the quantity, quality and exploitation of fishery resources. the results of the preliminary study show that so far as cold water fish are concerned, the rise in water temperature can lead to the narrowing of their distribution range, an earlier sex maturation, a reduction in conception and ovulation, a lower survival rate in young fish, which will then bring about the shortening of adult fish’s age, a weight reduction, and the “excaping behavior”. All these will cause a decrease in the number of adult fish and fish harvesting volume. As for the warm water fish, lukewarm water fish and all temperature fish, the rise in water temperature might have, to varying degrees, a negative impact on their growth and reproduction. The production and harvesting volume of the main economic species in China’s four sea areas will be lower, ranging from 5% to 15% and 1% to 8%, respectively.
