This makes them very interesting for doctors and scientists to study. They can actively swim up and down, but if they can not maintain the gases in their float, they will definitely sink. Clams continue to reproduce in contaminated habitats and they certainly look the same but we are currently working on a project to determine when and if reproduction might be impaired, especially the development of eggs. We should have an answer in about one year. Some species of animals such as primates and some birds also get high cholesterol levels like humans.
Treatment mostly centers around dietary modification.
There are hundreds of species of fishes in waters off New England. A good reference is a book by Bigelow and Schroeder, Fishes of the Gulf of Maine . Data on fish abundance 100 years ago are quite sparse so it is difficult to predict if species composition has changed, but it is unlikely that any species of fish has become extinct in the ocean waters off New England during the past 100 years. Some species are less abundant due to overfishing, but the species still exists. Hopefully, we will ensure that no species becomes extinct during the next 100 years.