Record heat, melting ice sheets, and rising seas reveal how climate change is affecting not only humans but also animals. And now a recent research by marine biologists at the University of Exeter has showcased that the rising CO2 levels in aquaculture can make fish swim towards predators instead of away from them.
Wondering how? Well, the climate change can disrupt the senses of fish including their smell, hearing and vision. According to marine biologists Robert Ellis and Rod Wilson, this is what makes them swim towards predator smells instead of away and even ignoring the sounds that normally deter them from risky habitats.
The researchers also show that farmed fish often live in CO2 conditions 10 times higher than their wild cousins. The scientists believe that further study of farmed fish – which already provides as much seafood for human consumption as that caught in the wild – may be crucial for understanding how aquatic species will evolve to climate change. It is said that by the end of this century, CO2 levels are predicted to be 2.5 times higher.
“Aquaculture may provide an ‘accidental’ long-term experiment that can help climate-change predictions. There is the enticing possibility that fish and shellfish previously grown in high CO2 aquaculture conditions over multiple generations can offer valuable insights regarding the potential for aquatic animals in the wild to adapt to the predicted further increases in CO2,” said Ellis.
On the other hand, Rod Wilson said: “Our research will allow fish farmers to optimize conditions, and specifically CO2 levels, to improve growth and health of their fish, profitability and the long-term sustainability of the industry. This is really important given that aquaculture is the only way we will increase seafood production to feed the growing human population, particularly given wild fish stocks are overexploited”.
This paper published has been published in the journal Global Change Biology.
(Image: Thinkstock)
Record heat, melting ice sheets, and rising seas reveal how climate change is affecting not only humans but also animals. And now a recent research by marine biologists at the University of Exeter has showcased that the rising CO2 levels in aquaculture can make fish swim towards predators instead of away from them.Wondering how? Well, the climate change can disrupt the senses of fish including their smell, hearing and vision. According to marine biologists Robert Ellis and Rod Wilson, this is what makes them swim towards predator smells instead of away and even ignoring the sounds that normally deter them from risky habitats.The researchers also show that farmed fish often live in CO2 conditions 10 times higher than their wild cousins. The scientists believe that further study of farmed fish – which already provides as much seafood for human consumption as that caught in the wild – may be crucial for understanding how aquatic species will evolve to climate change. It is said that by the end of this century, CO2 levels are predicted to be 2.5 times higher.“Aquaculture may provide an ‘accidental’ long-term experiment that can help climate-change predictions. There is the enticing possibility that fish and shellfish previously grown in high CO2 aquaculture conditions over multiple generations can offer valuable insights regarding the potential for aquatic animals in the wild to adapt to the predicted further increases in CO2,” said Ellis.On the other hand, Rod Wilson said: “Our research will allow fish farmers to optimize conditions, and specifically CO2 levels, to improve growth and health of their fish, profitability and the long-term sustainability of the industry. This is really important given that aquaculture is the only way we will increase seafood production to feed the growing human population, particularly given wild fish stocks are overexploited”.This paper published has been published in the journal Global Change Biology.(Image: Thinkstock)
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