LYCOS RETRIEVER 
Whales (Ecotourism): Oceans
built 803 days ago
Whales normally "cruise" at about 6 knots - twice as fast as a person usually walks. They are capable, in short bursts, of speeds up to 15 - 20 knots and have been known to keep pace with large ocean liners.
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It is still unclear how the whales find their way in the vast oceans. A number of possibilities have been put forward. Possibly the whales get their bearings on ocean currents, temperature gradients, physical features on the ocean floor (such as the edge of the continental shelf) or the earth's magnetic field.
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While the whales were in the Delta, onlookers feared they wouldn't make it back to the ocean. Now, with the whales closer to home, the crowd was more optimistic that the story will have a happy ending.
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Sadly, not all encounters with whales today are positive: there are more strandings in Tasmania than in any other Australian state. Most occur in the Circular Head and Macquarie Harbour–Ocean Beach areas.
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Now imagine the devastating impact uncontrolled loud noise can have on the lives of whales and other marine mammals. Many sources of ocean noise, including shipping and military sonar, are not monitored or controlled.
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Fin whales are found in all oceans of the world. They may migrate to subtropical waters for mating and calving during the winter months and to the colder areas of the Arctic and Antarctic for feeding during the summer months; although recent evidence suggests that during winter fin whales may be dispersed in deep ocean waters as opposed to migrating between wintering and summering regions.
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