NEW BEDFORD, Mass. — On June 4, staff from Buzzards Bay Coalition showed a group of about dozen adults and children how to quahog at Fort Taber Beach. Because of heavy rains the day before, the city’s shellfish warden had posted a red flag, signifying the shellfish beds were closed. While the group was still allowed to practice catching quahogs in the water, it meant participants (even those with permits) could not keep and eat what they caught. Yellow flags signify that shellfish beds are open.