Researchers can also use blood and blubber samples to provide information about the health of animals, and their habitats. Should a problem arise in the harbour seal population in the future, there will be a significant amount of information for scientists to consult. Boats contribute to marine noise pollution and can strike animals. Dolphins are frequent by-catch in the tuna fishery. We do not know why whales and dolphins beach themselves, but their immense weight crushes their organs and their need for moisture results in death on land.
Malnourishment is the most common illness and prevails with orphaned pups.
Some marine mammals have physical disabilities that impact their survival in the wild. For example, the Aquarium was home to Jazz, a blind seal abandoned as a pup. Jazz's condition prevented him from being released back into the wild. When hunting for food, mother seals often leave pups onshore for up to twenty-four hours. They will not return if they see someone near the pup.