Obovaria retusa
Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Obovaria_retusa
Overview
Obovaria retusa is a rare species of freshwater mussel in the family Unionidae, the river mussels. Its common names include golf stick pearly mussel and ring pink.
Obovaria retusa faces severe population declines primarily due to habitat degradation from dam construction and river channelization throughout its historic range in the Ohio and Tennessee River systems. Water pollution from agricultural runoff and industrial discharge has compromised water quality, while invasive zebra mussels compete for resources and attach to native mussel shells, often leading to mortality. The species' dependence on specific fish hosts for larval development makes it particularly vulnerable to declining fish populations caused by habitat fragmentation.
Habitat
Obovaria retusa inhabits medium to large rivers with stable gravel and sand substrates, typically in areas with moderate to swift current flow. The species requires clean, well-oxygenated water and is found in depths ranging from shallow riffles to deeper pools in major river systems.
