The museum will not collect any dolphins from the wild. Scientific data indicates that dolphins live as long, and probably longer, at a facility like VMSM as they do in the wild. Dolphins born in facilities consider where they are as home. It is what they know and understand. They don't consider it an alien environment because it is where they have always lived.
Dolphins have voluntary control over the use of their sonar.
They use it only when needed. Sonar is used primarily to find food, avoid predators and to navigate. They can use it at varying intensities based on what they are looking for. Although we do have large numbers of dolphins that live off the Virginia coast during the warmer months, visitors are often unaware of their presence. Glimpses of these animals are usually brief and from a distance, and dolphins spend a majority of their time underwater.