☆ 4.6 Article

Estimating Heat Stress Effects on the Sustainability of Traditional Freshwater Pond Fishery Systems under Climate Change

WATER (2023)

期刊

WATER

卷 15, 期 8, 页码 -

出版社

MDPI

DOI: 10.3390/w15081523

关键词

freshwater aquaculture; water temperature; climate change; common carp; maraene whitefish

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Environmental Sciences Water Resources

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This study evaluated the impact of climate change on fisheries in the Czech Republic by examining changes in water temperature and their effects on fish farming. A model was developed to calculate surface water temperature based on air temperature, and the results showed that there will be a sharp increase in temperature regimes, posing challenges to traditional forms of common carp farming. Adaptation measures will be necessary to mitigate the impact of rising water temperatures.

Freshwater fish production is significantly correlated with water temperature, which is expected to increase under climate change. This study evaluated changes in water temperature and their impact on productive ponds at fisheries in the Czech Republic. A model was developed to calculate surface water temperature based on the five-day mean of the air temperature and was then tested in several ponds in three major Czech fish production areas. The output of the surface water temperature model was compared with independently measured data (r = 0.79-0.96), and the verified model was then applied to predict climate change conditions. The results were evaluated with regard to the thresholds characterizing the water temperature requirements of fish species and indicated that the limitation of Czech fish farming results from (i) an increased number of continuous periods during which given fish species are threatened by high water temperatures and (ii) the extension of continuous periods with stressful water temperatures. For Czech fisheries, the model suggests a sharp increase in unprecedented temperature regimes, which will pose critical challenges to traditional forms of common carp farming within several decades. Although reducing the level of eutrophication and loading them with organic substances might alleviate expected threads, farming current fish species in deeper and colder ponds at higher elevations might be inevitable.

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Effects of Warming on Aquatic Snails and Periphyton in Freshwater Ecosystems with and without Predation by Common Carp

Haowu Cheng, Mingjun Feng, Peiyu Zhang, Huan Zhang, Huan Wang, Jun Xu, Min Zhang

Summary: Freshwater gastropods are important in shallow aquatic ecosystems, and their response to climate change can have cascading effects on periphyton. Warming was found to decrease the biomass and density of two snail species, and the presence of fish further exacerbated these effects. In the absence of fish, warming also led to an increase in periphyton biomass due to lower grazing pressure. These findings highlight the potential impacts of climate change on gastropod communities and food web structures in freshwater ecosystems.