Related Clues:

• River herrings
• Piscine symbol of overcrowdedness
• Fish that can detect ultrasound
• Tightly packed pilchard
• Cousin of an alewife
• Alewife's relative
• The fish in John McPhee's 'The Founding Fish'
• Fish species
• Subway rider during rush hour, metaphorically
• River herring
• Atlantic Coast catch
• Certain rush hour commuter, metaphorically
• Fish of the herring family
• Kin to a herring
• Type of herring