According to Sea World, the migration routes of bottlenose dolphins vary and are dependent on factors including season, food supply and water temperature. Some coastal dolphin populations that live in colder waters appear to migrate to warmer waters more frequently than warm water populations. For example, dolphins living near the New Jersey shore during summer months migrate to coastal southern shores found in North Carolina.
Most coastal dolphins live within a limited home range and do not stray from their particular areas. This is especially true for populations in warmer territories, such as in Florida, Georgia and Southern California. A typical home range for dolphin families is around 48 to 155 miles, and it is common for home ranges to overlap. Marine surveys show that dolphin populations number in the thousands and vary according to location. For instance, the Gulf of Mexico tends to have a large population of up to 45,000, while the Western North Atlantic has up to 29,000 dolphins.
Vallarta Adventures notes that dolphins are fast swimmers, clocking in speeds of up to 7 miles per hour. The fastest they swim is around 22 miles per hour. However, dolphins sometimes seem to just take it easy when boats are nearby, and they enjoy riding the currents.