Dall porpoise
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The Dall's porpoise is a small cetacean found in the northern Pacific Ocean. It has a triangular head and robust body with dark coloring and white markings. Dall's porpoises eat small fish and cephalopods. Their range extends throughout the Bering Sea, Sea of Okhotsk, and Sea of Japan. Females typically give birth every three years after a 12 month gestation period. While still numerous, Dall's porpoises are threatened by incidental catch in fisheries and coastal whaling operations.
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Fisheries and Aquaculture by Abdul Hameed Korai ( Tehsildar )
Fisheries and Aquaculture by Abdul Hameed Korai ( Tehsildar )
For M.Sc , B.sc , Fisheries & aquaculture related exams
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Would you like to know more about the seacreatures
Would you like to know more about the seacreatures
Fisheries and Aquaculture by Abdul Hameed Korai ( Tehsildar )
Fisheries and Aquaculture by Abdul Hameed Korai ( Tehsildar )
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Dall porpoise
- 1. A Coastal Alaskan Organism: The Dall’s Porpoise-
- 2. Scientific Facts on the Dall’s Porpoise: Taxonomy: Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Cetacea Family: Phocoenidae Genus: Phocoenoides Species: dalli Scientific name: Phocoenoides dalli Physical Description: The Dall’s porpoise has a relatively small, triangular head with a robust body. They have small, rounded flippers located higher up on the body. The dorsal fin is triangular in shape and located on the center-back of the body. They are mainly black with white from the stomach, scaling up the side of the body and on its fins. Food: Dall’s porpoises eat a variety of small fishes and caphalopods. They eat schooling fish like herring,anchovies,pilchards, mackerals, hake, sauries, and mesopelagic fish like myctophids and smelts.
- 3. Geographical range: The Dall’s Porpoise range through much of the North Pacific and adjacent seas like the Bering Sea, the Okhotsk Sea and the Sea of Japan.
- 4. Reproductive Cycle: Female Dall's porpoises reproduce at approximately six years of age while male Dall's porpoises mature at 8 years of age. Dall's porpoise calves are born in mid-summer after a 12 month gestation period. They are about 3 feet (0.9 meters) long. Calves and their mothers live separate from main porpoise herds for a time. Dall's porpoise mothers usually have calves every 3 years.
- 5. Orca whales and various types of sharks are predators of the Dall’s Porpoise. Interesting facts on the Dall’s Porpoise: Dall's porpoises are still numerous, but in urgent need of protection due to the large numbers caught in Japanese gillnet fisheries and by Japanese coastal whaling operations. Thousands are taken for food each year by the Japanese in their coastal waters.
- 6. Works Cited: Culik, Boris. “Phocoenoidesdalli.” CMS. February 4, 2010. March 30, 2011. http://www.cms.int/reports/small_cetaceans/data/P_dalli/p_dalli.htm “Dall’s Porpoise.” American Cetacean Society. July, 2001. March 29, 2011 < http://www.acsonline.org/factpack/DallsPorpoise.htm.> “Dall's Porpoise (Phocoenoidesdalli).” Office Of Protected Resources. March 29, 2011 <http://www.nmfs.noaa.gov/pr/species/mammals/cetaceans/dallsporpoise.htm.> Prevenas, Maggie. “Creature feature: Dall’s Porpoise.” Polar Trec. March 30, 2011. http://www.polartrec.com/expeditions/bering-ecosystem-study/journals/creature-feature-dall%E2%80%99s-porpoise