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Transcript of Common Dolphins
Dolphins, like other animals, have an immune system, that protects them against disease. That does not mean of course that dolphins do not get ill. Dolphins are susceptible to bacterial, viral and fungal diseases. The most common disease is (bacterial) pneumonia. Dolphins also often have skin diseases, like dolphin pox (small black dots or tattoo-like lesions, caused by a virus). Also fungal diseases (like candida infections) are common.
Pollutants, especially DDT and PCBs, have a negative effect on the immune system. If a dolphin carries a lot of these substances, there is an increased risk of disease.
Wild dolphins often have a lot of parasites. Most common is a nematode worm (called Nasitrema) which lives in the nasal sinuses of the dolphin. Almost every wild dolphin has this parasite. Dolphins also can have tape worms and liver flukes (a trematode worm). Usually, the parasites are not life threatening, just irritating. But when a dolphin becomes ill, these parasites may multiply and cause additional problems. Animals that are found stranded on the beach usually have a lot of parasites.
Every now and then, large numbers of dolphins suddenly die because of a natural toxin (poison). When certain algae (dinoflagellates) suddenly bloom, fishes may have a lot of these algae in their stomachs. Usually, these algae are harmless for fishes. But when dolphins eat a lot of these fishes, the toxin is released and the dolphins get poisoned. In the past years, a few of these algal blooms have been blamed for mass mortalities in dolphins, especially along
the Atlantic coast of the United States. The Common Dolphin eats fish, squid, or octopus. I'm going to be a marine biologist when I grow up. I borrowed a book from the library about whales, dolphins, and porpoises. It had all of the information about whales, dolphins, and porpoises. So I went to the oceanic dolphins with prominent beaks. And on the first dolphin of oceanic dolphins with prominent beaks was the Common Dolphin, and so I became interested and decided to do a power point about Common Dolphins. Why Did I Do This Power Point?