RUDN University Biologist: salted water saves fish from stress when transporting
Stress during forced relocation is experienced not only by people, but also by fish in aquaculture. Due to stress, the internal balance in the body of fish is disturbed — how the composition of blood and enzymes changes along the chain, muscle tone increases, behavior changes. Ultimately, this leads to a decrease in health indicators and even death. A RUDN University biologist with colleagues from Brazil and Iran proposed a simple way to alleviate stress during transportation in Nile tilapia, one of the most common species in fisheries. To do this, one just need to salt the water a little.
“Fish is an important product that is present in the diet of many people. It is important to deliver the fish fresh. One of the ways is the delivery of live individuals to stores. However, transportation is a stressful event that negatively affects fish physiology. Stressful events increase cortisol levels, which increase the energy needed to cope with stress. Higher energy costs cause an increase in the gill ventilation rate, which leads to osmotic and ionic imbalance,” Morteza Yousefi, Associate Professor of the Department of Veterinary Medicine, RUDN University.
In itself, the idea of adding salt to water during transport to alleviate stress is not new. However, for the Nile tilapia, the possibility of such a practice has not yet been studied. RUDN University Biologists studied 84 individuals of the Nile tilapia grown on an Iranian fish farm. The fish were divided into three groups and placed in a medium with different concentrations of salt — 2 or 4 grams per liter — and completely fresh water. For three hours, the fish were transported by truck, after which their performance was examined.
The main indicator of stress biologists cortisol levels were measured. Salt supplementation at a concentration of 2 and 4 grams per liter lowered cortisol levels. Fish in fresh water after transportation increased cortisol from 30 to 80 nanograms per milliliter, and fish in salt water — only
“Adding salt to the water has a positive effect on the transport of Nile tilapia. In fish in salt water, the degree of stress is reduced, the liver is less damaged, oxidative stress is less pronounced, and hydromineral balance is better maintained. A concentration of 4 grams per liter of salt is useful for transporting Nile tilapia,” Morteza Yousefi, Associate Professor of the Department of Veterinary Medicine at RUDN University.
The results are published in Aquaculture Reports.
Imagine a world where everyone has enough food, clean water, access to education, and decent work. A world where nature is protected and the future of our planet is cared for. These are the Sustainable Development Goals—to achieve a sustainable future for all! To this end, in 2015, the United Nations (UN) defined 17 Sustainable Development Goals (SDGs). The SDGs are a global plan that helps countries and people work together towards a better future. All 193 UN member states have joined the plan.
Researchers from the Faculty of Artificial Intelligence at RUDN University conducted a large-scale study that revealed systemic errors in large language models (LLMs) when diagnosing depression based on text. This work, carried out in collaboration with colleagues from AIRI, Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences, Ivannikov Institute for System Programming of the Russian Academy of Sciences, Moscow Institute of Physics and Technology, and MBZUAI, not only identifies the problem but also lays the foundation for the creation of more reliable and secure tools for detecting depression and anxiety.
Alexandra Sentyabreva, a junior researcher at the Laboratory of Cell Technologies and Tissue Engineering at RUDN Research Institute of Molecular and Cellular Medicine at the Russian University of People's Friendship, won the competition for young scientists at the All-Russian Scientific Conference “Topical Issues of Morphogenesis in Norm and Pathology.” She was awarded the Academician A.P. Avtsyn Prize.
Imagine a world where everyone has enough food, clean water, access to education, and decent work. A world where nature is protected and the future of our planet is cared for. These are the Sustainable Development Goals—to achieve a sustainable future for all! To this end, in 2015, the United Nations (UN) defined 17 Sustainable Development Goals (SDGs). The SDGs are a global plan that helps countries and people work together towards a better future. All 193 UN member states have joined the plan.
Researchers from the Faculty of Artificial Intelligence at RUDN University conducted a large-scale study that revealed systemic errors in large language models (LLMs) when diagnosing depression based on text. This work, carried out in collaboration with colleagues from AIRI, Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences, Ivannikov Institute for System Programming of the Russian Academy of Sciences, Moscow Institute of Physics and Technology, and MBZUAI, not only identifies the problem but also lays the foundation for the creation of more reliable and secure tools for detecting depression and anxiety.
Alexandra Sentyabreva, a junior researcher at the Laboratory of Cell Technologies and Tissue Engineering at RUDN Research Institute of Molecular and Cellular Medicine at the Russian University of People's Friendship, won the competition for young scientists at the All-Russian Scientific Conference “Topical Issues of Morphogenesis in Norm and Pathology.” She was awarded the Academician A.P. Avtsyn Prize.