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Measures water acidity or alkalinity on a scale of 0-14. Neutral is 7. Most fish thrive in 6.5-8.5 range.

Water temperature directly affects fish metabolism and activity. Optimal range varies by species.

Amount of oxygen dissolved in water. Essential for fish survival. 6+ mg/L is ideal for most fish species.

Water temperature directly affects fish metabolism and activity. Optimal range varies by species.

Measures dissolved ions and minerals in water. Indicates salinity and pollution levels. Freshwater: 100-500 µS/cm.

Amount of oxygen dissolved in water. Essential for fish survival. 6+ mg/L is ideal for most fish species.

Conductivity (µS/cm) - a water quality measurement. Contact local authorities for specific safety guidelines.

Measures dissolved ions and minerals in water. Indicates salinity and pollution levels. Freshwater: 100-500 µS/cm.