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.

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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 a low dose of methylene blue made the fish’s white blood cell count spike and changed the types of white blood cells, which means their immune system was stressed or messed up — just like 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.

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

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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.

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