Brown Blood Disease can be caused by a high concentration of which substance in the water?

Brown Blood Disease, also known as methemoglobinemia, is primarily associated with the presence of nitrite in the aquatic environment. When nitrite levels are high, it interferes with the hemoglobin in fish blood, converting it to methemoglobin, which cannot effectively transport oxygen. This condition leads to a distinct brown coloration of the blood, hence the name "Brown Blood Disease."

The elevated levels of nitrite in the water can arise from various sources, including inadequate filtration and the cycling of nitrogen compounds in aquaculture systems. Monitoring and managing nitrite concentrations is critical for the health of aquatic organisms, as it can quickly lead to hypoxia and various physiological stresses.

While other substances mentioned, such as ammonia and nitrate, are also crucial to monitor for their toxic effects on aquatic life, they do not specifically cause Brown Blood Disease. Ammonia is toxic to fish, but its impact manifests in different ways than nitrite. Nitrate, while harmful in high concentrations, primarily affects fish health through chronic exposure rather than acute toxicity like nitrite. pH, while vital for overall environmental conditions, does not directly lead to the symptoms associated with Brown Blood Disease.