Life Lines by Dr. Dolittle

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Tag Archive for ‘goldfish’

One reason why fish and mammals lose their appetite during stress

I don’t know about you, but sometimes I lose my appetite when I am really stressed. The endocrine system is responsible for controlling our stress responses and involves three main endocrine glands – the hypothalamus, pituitary, and adrenal gland. Hence, the stress pathway is often referred to as the “HPA axis”. When we are stressed, the hypothalamus releases a hormone called corticotropin releasing factor (CRF), which triggers the release of […]

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Goldfish learn how to drive and target similar visual cues as humans

Researchers at Ben-Gurion University of the Negev constructed a tank on wheels that goldfish actually learned how to “drive”. Using cameras, the “car” was able to move in the direction the fish swam. They then tested whether the fish could purposefully navigate the car towards a target and observed that the fish could indeed swim towards a target in return for a treat, of course. In a prior study, the […]

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Anoxia tolerance in goldfish

The reason mammals are not very good at tolerating hypoxic (i.e. low oxygen) environments, is because the brain relies heavily on oxygen for metabolism. It is so stingy, it uses about 20% of the oxygen in the body to make ATP. Without oxygen, the brain has to rely on glycolysis to make ATP and this process is not good at meeting the energy requirements of the neurons, ultimately resulting in […]

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Ammonia tolerance of goldfish

Liver failure or congenital defects can lead to a build-up of ammonia in the brain of mammals resulting in life-threatening swelling, convulsions and comas. For goldfish (Carassius auratus), environmental exposure to ammonia causes reversible swelling of the brain. In a new study published in the American Journal of Physiology – Regulatory, Integrative and Comparative Physiology, researchers wanted to explore how the fish were able to accomplish this. They exposed goldfish to high […]

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