The West Tisbury board of health issued an advisory against going in the water at Tiah’s Cove in Tisbury Great Pond Wednesday after a cyanobacteria bloom was discovered there.

The “red” level cynacobacteria advisory was issued through MVCyano, a collaborative project between the town boards of health and the Great Pond Foundation. Under a red level advisory, the board recommends against all swimming activities and most boating activities, as well as keeping children and pets away from the water.

Wednesday’s advisory was the first of the season for the Island’s great ponds and comes as towns continue to work on ways to improve their water quality.

Blooms can produce environmental toxins that can be harmful to both humans and pets. A sample from the cove was being sent out for a cyanotoxin analysis.

More information can be found at the Great Pond Foundation's website.