Females give birth to a single calf every year or every second year, following a gestation of 10-11 months. The body of the harbor porpoise is small in size, but rotund and stocky through the mid-section, tapering to a slender tailstock. Harbor porpoises in the United States are not endangered or threatened. This porpoise often ventures up rivers, and has been seen hundreds of miles from the sea. The harbor porpoise (Phocoena phocoena) is one of the smallest and most common cetaceans. As its name implies, it stays close to coastal areas or river estuaries, and as such, is the most familiar porpoise to whale watchers. Its snout is blunt and rounded without a prominent beak. 7 Pleasing Harbour Porpoise Facts. These commands originated as Artillery Districts, to control groups of forts constructed under the,The major Harbor Defense Commands in the Continental United States (.The major Harbor Defense Commands in US territories were:The Harbor Defense Commands established as a result of the 1940,Artillery formations of the United States.Confusingly, circa 1914-1924 several groups of National Guard coast artillery companies were designated as "Coast Defense Commands" (CDC), such as the 8th CDC and 13th CDC in the New York National Guard.These are arranged in the traditional order of US Army reports, starting in Maine and working clockwise around the US.CS1 maint: multiple names: authors list (,List of coastal fortifications of the United States,National Guard coast artillery regiment histories at the CDSG,List of all US coastal forts and batteries,National Archives and Records Administration, RG 392 index,United States Army Center of Military History,https://en.wikipedia.org/w/index.php?title=Harbor_Defense_Command&oldid=977092770,20th-century military history of the United States,Articles using NRISref without a reference number,Creative Commons Attribution-ShareAlike License.Probably merged with Coast Defenses of Portland prior to 1917 (not listed in Rinaldi WWI),Anti-aircraft training center in World War II,Also separate Harbor Defenses of Sandy Hook since at least World War I, merged in World War II as Harbor Defenses of New York,Fort Hancock, Sandy Hook Proving Ground, Highlands Military Reservation.Probably split from HD Southern New York 1915,Temporary in World War II with Panama mounts,rearmed with Panama mounts in World War II,rearmed with Panama mounts in World War II as Temporary Harbor Defenses of,Coast Defenses of Oahu divided into Honolulu and Pearl Harbor in March 1921,Only two 8-inch and two 155 mm guns at St. John's. We implemented the Harbor Porpoise Take Reduction Plan to reduce interactions between harbor porpoise and commercial gillnet gear capable of catching multispecies in both the New England and the Mid-Atlantic. In some areas the Plan requires the use of acoustic deterrent devices called Pingers. Harbour Porpoises stay close to coasts and estuaries (as opposed to open waters), making them one of the most familiar of marine mammals to people. The harbour porpoise (Phocoena phocoena) is one of seven species of porpoise. The Plan has several components including restrictions on where, when, and how gear can be set. Females give birth to one calf every two years, usually between May and August. Conservation. It consisted of the forts, controlled underwater minefields, and other coastal defenses of a particular harbor or river. They rarely survive beyond 8 to 12 years, but can live to 20 years. Harbor porpoises travel most often in pairs, small groups of 6 to 10, and occasionally larger groups of 50 to 100. Harbour Porpoises are one of the smallest examples of marine mammals. NOAA Fisheries helps conserve the harbor porpoise through collaborative management, integrated science, partnerships, and outreach.
From Wikipedia, the free encyclopedia A Harbor Defense Command was a military organization of the United States Army Coast Artillery Corps designated in 1925 from predecessor organizations dating from circa 1895. They nurse for 8 to 12 months. The harbor porpoise reaches sexual maturity at age three or four. Harbor porpoises are found throughout the temperate coastal waters of the Northern Hemisphere. The mothers usually take their newborns to secluded coves for nursing. Mating mainly takes place from June to September, with births occurring between May and August. Harbour porpoises are polygynandrous, two or more males mating with two or more female porpoises. Like all marine mammals, they are protected under the Marine Mammal Protection Act. However they are shy and are generally not approachable like Dolphins. Its mouth is small and tilts upward, and contains 22 to 28 small, spade shaped teeth on each side of the upper jaw and 22 to 26 on each side of the lower jaw. It is one of the smallest marine mammals. They are found in northern temperate to sub-arctic waters most often in shallower bays or near shore.
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