Climate change poses risks to aquaculture, threatening food security

In a study published in the journal Microorganisms, scientists have depicted the effect of global warming on viral infection-related mortality in farmed aquatic animals. The meta-analysis conducted in the study reveals an association between increasing temperature and increasing viral pathogenicity.

Impact of Global Warming on the Severity of Viral Diseases: A Potentially Alarming Threat to Sustainable Aquaculture WorldwideStudy: Impact of Global Warming on the Severity of Viral Diseases: A Potentially Alarming Threat to Sustainable Aquaculture Worldwide, Image Credit: sercandulger / Shutterstock

Background

Maintaining food security for an ever-increasing human population while reducing the environmental impact of food production has become a major global challenge. In an effort to reduce the negative environmental impact of food production, particularly in terms of land use, the global scientific community has taken significant steps to assess the environmental and health impacts of shifting from meat-based diets to fish- and seafood-based diets.

Aquaculture (farming of aquatic animals and plants) is one of the fast-growing food production sectors in the world. As a result, it plays a substantial role in global food security. However, the rapid emergence and transmission of infectious diseases among animals due to global warming have become a major problem restricting the sustainable development of aquaculture.

In the current study, scientists conducted a meta-analysis of published studies investigating viral infection in farmed aquatic animals. They specifically evaluated whether increased water temperature due to global warming can increase the severity of viral infections and related mortality in farmed aquatic animals.

Study design

The scientists systematically screened peer-reviewed articles describing the mortality of farmed aquatic animals due to viral infections. They selected studies that reported stable specific temperatures for infected aquatic animals. Based on the inclusion criteria, they identified three viral pathogens, namely Ostreid herpesvirus-1 (OsHV-1), Cyprinid herpesvirus 3 (CyHV-3) and Betanodavirus.

Linear regression models were developed to investigate the effect of temperature on the mortality of farmed aquatic animals due to infection by each of these pathogens. Fixed effects included in the models were temperature, life stage, type of infection, and infection dose.

Studies reporting Betanodavirus infections included different fish species and variants of the virus. Thus, host and pathogen taxonomy were included as random effects in the models analyzing the Betanodavirus dataset.     

Important observations

A total of 53 studies were included in the meta-analysis to investigate the effect of temperature on aquatic animal mortality due to viral infections by OsHV-1, CyHV-3, or Betanodavirus.

The findings revealed that induction in water temperature leads to higher mortality rates in CyHV-3-infected carps, OsHV-1-infected oysters, and Betanodavirus-infected fish.

Among the model’s fixed effects, the temperature was identified as the only vital predictor of mortality for OsHV-1-infected oysters. For CyHV-3-infected carps, temperature and type of infection were identified as important predictors of mortality.

Model-predicted mortality in farmed aquatic animals

According to the model predictions, a 1 °C increase in water temperature resulted in an induction in mortality of 1.47–8.33% in OsHV-1-infected oysters, 2.55–6.98% in CyHV-3-infected carps, and 2.18–5.37% in Betanodavirus-infected fish.

Considering three types of infections together, the models predicted that an overall increase in water temperature of 1 °C is associated with 3.07–5.70% induction in mortality rates among infected aquatic animals.   

Study significance

The study finds a positive association between water temperature and viral pathogenicity for OsHV-1, CyHV-3, and Betanodavirus infections.

Since the study includes only three types of infections, the findings cannot be generalized for other pathogens. However, three viruses included in the study are known to infect a wide range of aquatic animals from different habitats in tropical, subtropical, and temperate regions worldwide.

According to the United Nations Intergovernmental Panel on Climate Change (IPCC), the global average temperature is expected to increase by 1.4–5.8 °C by 2100. Considering the findings of this study, global warming of this intensity can put a significant burden on aquaculture sustainability as well as food security.  

Future research is urgently needed to determine whether the findings of this study can be extrapolated to other relevant aquatic viral infections, as stated by the scientists. Furthermore, it is critical to comprehend the effect of global warming on the dynamics of co-infections.

Journal reference:
  • Combe M. 2023. Impact of Global Warming on the Severity of Viral Diseases: A Potentially Alarming Threat to Sustainable Aquaculture Worldwide. Microorganisms. https://www.mdpi.com/2076-2607/11/4/1049
Dr. Sanchari Sinha Dutta

Written by

Dr. Sanchari Sinha Dutta

Dr. Sanchari Sinha Dutta is a science communicator who believes in spreading the power of science in every corner of the world. She has a Bachelor of Science (B.Sc.) degree and a Master's of Science (M.Sc.) in biology and human physiology. Following her Master's degree, Sanchari went on to study a Ph.D. in human physiology. She has authored more than 10 original research articles, all of which have been published in world renowned international journals.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Dutta, Sanchari Sinha Dutta. (2023, April 19). Climate change poses risks to aquaculture, threatening food security. News-Medical. Retrieved on July 24, 2024 from https://www.news-medical.net/news/20230419/Climate-change-poses-risks-to-aquaculture-threatening-food-security.aspx.

  • MLA

    Dutta, Sanchari Sinha Dutta. "Climate change poses risks to aquaculture, threatening food security". News-Medical. 24 July 2024. <https://www.news-medical.net/news/20230419/Climate-change-poses-risks-to-aquaculture-threatening-food-security.aspx>.

  • Chicago

    Dutta, Sanchari Sinha Dutta. "Climate change poses risks to aquaculture, threatening food security". News-Medical. https://www.news-medical.net/news/20230419/Climate-change-poses-risks-to-aquaculture-threatening-food-security.aspx. (accessed July 24, 2024).

  • Harvard

    Dutta, Sanchari Sinha Dutta. 2023. Climate change poses risks to aquaculture, threatening food security. News-Medical, viewed 24 July 2024, https://www.news-medical.net/news/20230419/Climate-change-poses-risks-to-aquaculture-threatening-food-security.aspx.

Comments

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News Medical.
Post a new comment
Post

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.