The Impact of Prolonged Extreme High Temperature Weather on Freshwater Crab Farming
Abstract：I. The Impact of Extreme High Temperature Weather on the Freshwater Crab Industry
(1) Significant Decline in Yield
1. Increased Mortality Due to High Temperatures
High temperatures cause the bottom water temperature of crab ponds to exceed 35°C, leading to the death and decay of aquatic plants such as Egeria densa, deteriorating water quality, and causing juvenile crab mortality. For example, in 2024, Anhui Dangtu County suffered from high temperatures, affecting 63,500 mu of aquaculture area, with fishery losses exceeding 100 million yuan.
2. Obstruction of Growth Cycle
High temperatures delay molting time; in 2024, freshwater crabs completed only 4 molts (normally 5). In 2024, the size of freshwater crabs in Gaoyun, Jiangsu was generally reduced by 50-75 grams per crab, and the yield per acre dropped from 150 kg to 125 kg.
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Publication Date：2025-06-10
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 3-6 )