When rohu fish are exposed to a low but toxic level of a blue dye used in fish farms, their blood loses a lot of its oxygen-carrying capacity, making them very weak.

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Evidence from Studies

Supporting (1)

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Study of Hematological Alterations and Oxidative Stress in Labeo rohita Exposed to Sub-lethal Methylene Blue

Cohort Study

Animal

The study found that when fish were exposed to a low but prolonged dose of methylene blue, their blood lost over half its hemoglobin — the molecule that carries oxygen — which means they developed anemia, exactly as the claim says.

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No contradicting evidence found

Source Study

Study of Hematological Alterations and Oxidative Stress in Labeo rohita Exposed to Sub-lethal Methylene Blue

Score: 9

DOI: 10.55544/jrasb.3.1.58

Similar Assertions

Scientists can tell if fish have been exposed to this blue dye by checking their blood — changes in red and white blood cells are clear warning signs.

83%

The blue dye causes harmful chemical reactions in fish cells that damage their blood, and the more damage there is, the lower the blood’s oxygen-carrying ability becomes.

82%

The blue dye makes the fish’s red blood cells shrink and get wrinkled, which probably stops them from carrying oxygen properly.

80%

Fish exposed to this blue dye show a spike in certain white blood cells and a drop in others, which means their immune system is stressed or not working normally.

77%