What is the target bloom size for HABS in the Western Lake Erie Basin?

• A. 2.0
• B. 3.0
• C. 4.0
• D. 5.0

Answer: (B)

The entry point here is recognizing the threshold used to guide HAB management in the Western Lake Erie Basin. The target bloom size is 3.0, which serves as the benchmark for triggering monitoring, advisories, and nutrient-management actions aimed at reducing bloom impacts. This value is chosen to balance timely protective action with practical management, so when blooms reach about this size, agencies emphasize measures to limit nutrients and inform water users. Smaller thresholds would trigger action earlier, while larger thresholds would delay responses; 3.0 is the established midpoint used in the basin’s HAB response framework.