Chionoecetes bairdi

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Chionoecetes bairdi
Chionoecetes bairdi.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Decapoda
Suborder: Pleocyemata
Infraorder: Brachyura
Family: Oregoniidae
Genus: Chionoecetes
Species:
C. bairdi
Binomial name
Chionoecetes bairdi
M. J. Rathbun, 1924  [1]

Chionoecetes bairdi is a species of snow crab, alternatively known as bairdi crab and tanner crab. C. bairdi is closely related to Chionoecetes opilio , and it can be difficult to distinguish C. opilio from C. bairdi. Both species are found in the Bering Sea and are sold commercially under the name "snow crab." Tanner crabs have suffered from overfishing and as a result strict controls have been placed on tanner crab fisheries. It was named by Mary Jane Rathbun, a Smithsonian employee who became one of the leading authorities on crab taxonomy. She named the crab for Spencer Baird, her mentor, who in the 1880s as Secretary of the Smithsonian Institution and head of the United States Fish Commission, had given her her first position. [2]

Contents

Biology

The mouthparts, other sensory organs, and pincers of an adult male Crabface.JPG
The mouthparts, other sensory organs, and pincers of an adult male

Tanner crabs are considered a short-tailed or "true" crab. They are decapods with pincer claws on their frontmost pair of legs. They can live over a decade with most adults reaching 1 to 4 pounds (0.45 to 1.81 kg) by the time they reach adulthood, usually after about five years. Females will incubate fertilized eggs for a full year before hatching during spring plankton blooming season. The larvae are at first able to swim, but lose this ability and settle to the bottom after about two months. The tanners' diet consist mostly of other ocean bottom crustaceans, clams and worms. Bottomfish and humans are their main predators. Little is known about their social structure except that the sexes remain mostly separate except during mating season. [3] Tanner crabs are vulnerable to bitter crab disease. [4]

Fisheries

Tanners are normally caught through the use of crab pots similar to those used to catch the larger King crab. The Bering Sea fishery for tanners opened in 1961 and soon became a major fishery in the North Pacific, with record catches as high as 332,000,000 pounds (151,000,000 kg).

New fisheries regulations limit the catch and ensure that a portion of crab be available to local Alaskan communities Crablegsonice.JPG
New fisheries regulations limit the catch and ensure that a portion of crab be available to local Alaskan communities

Before the passage of the Magnuson Fishery Conservation and Management Act of 1976 much of the Bering Sea tanner crab was caught by Japanese and Soviet fishing vessels. [3]

Due to the massive harvests, numbers declined sharply, with only 1,200,000 pounds (540,000 kg) harvested in 1984. Sensing the danger of overfishing tanner crab to the point of extinction, legislators and fisheries managers closed tanner crab fishing entirely in 1986 and 1987. Policy adjustments were made to limit the catch, but the fishery was closed again in 1997 due to a very poor harvest in 1996.

In the mid-2000s fisheries managers introduced a "Crab Rationalization Program" based on similar programs in the North Atlantic and New Zealand. The program introduced individual fishing quotas based on each crab fishing boat's previous catches and a requirement that a percentage of the catch be offered for sale in the regions where it was caught.

This program was popular with environmental and conservation groups, although some small-scale crab fisherman complained that it placed them at a disadvantage as they could never catch more than their allotted share even if there were more crab available. [5] In addition to overfishing, researchers from the School of Fisheries and Ocean Sciences have hypothesized that prevailing winds may affect crab population numbers from one year to the next. [6]

Related Research Articles

<span class="mw-page-title-main">Bering Sea</span> Sea of the northern Pacific Ocean off the coast of Alaska and Russia

The Bering Sea is a marginal sea of the Northern Pacific Ocean. It forms, along with the Bering Strait, the divide between the two largest landmasses on Earth: Eurasia and the Americas. It comprises a deep water basin, which then rises through a narrow slope into the shallower water above the continental shelves. The Bering Sea is named after Vitus Bering, a Danish navigator in Russian service, who, in 1728, was the first European to systematically explore it, sailing from the Pacific Ocean northward to the Arctic Ocean.

<span class="mw-page-title-main">Fishery</span> Raising or harvesting fish

Fishery can mean either the enterprise of raising or harvesting fish and other aquatic life or, more commonly, the site where such enterprise takes place. Commercial fisheries include wild fisheries and fish farms, both in freshwater waterbodies and the oceans. About 500 million people worldwide are economically dependent on fisheries. 171 million tonnes of fish were produced in 2016, but overfishing is an increasing problem, causing declines in some populations.

<span class="mw-page-title-main">Trawling</span> Method of catching fish

Trawling is an industrial method of fishing that involves pulling a fishing net, that is heavily weighted to keep it on the seafloor, through the water behind one or more boats. The net used for trawling is called a trawl. This principle requires netting bags which are towed through water to catch different species of fishes or sometimes targeted species. Trawls are often called towed gear or dragged gear.

<span class="mw-page-title-main">Bycatch</span> Fish or other marine species that is caught unintentionally

Bycatch, in the fishing industry, is a fish or other marine species that is caught unintentionally while fishing for specific species or sizes of wildlife. Bycatch is either the wrong species, the wrong sex, or is undersized or juveniles of the target species. The term "bycatch" is also sometimes used for untargeted catch in other forms of animal harvesting or collecting. Non-marine species that are caught but regarded as generally "undesirable" are referred to as rough fish or coarse fish.

<span class="mw-page-title-main">Fishing industry</span> Economic branch

The fishing industry includes any industry or activity that takes, cultures, processes, preserves, stores, transports, markets or sells fish or fish products. It is defined by the Food and Agriculture Organization as including recreational, subsistence and commercial fishing, as well as the related harvesting, processing, and marketing sectors. The commercial activity is aimed at the delivery of fish and other seafood products for human consumption or as input factors in other industrial processes. The livelihood of over 500 million people in developing countries depends directly or indirectly on fisheries and aquaculture.

<i>Chionoecetes</i> Genus of crabs

Chionoecetes is a genus of crabs that live in the northern Pacific and Atlantic Oceans.

<span class="mw-page-title-main">Gafftopsail catfish</span> Species of fish

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<i>Deadliest Catch</i> American reality television series

Deadliest Catch is an American reality television series that premiered on the Discovery Channel on April 12, 2005. The show follows crab fishermen aboard fishing vessels in the Bering Sea during the Alaskan king crab and snow crab fishing seasons. The base of operations for the fishing fleet is the Aleutian Islands port of Dutch Harbor, Alaska. Produced for the Discovery Channel, the show's title is derived from the inherent high risk of injury or death associated with this line of work.

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<span class="mw-page-title-main">Alaskan king crab fishing</span> Commercial harvest of Alaskan king crab

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<span class="mw-page-title-main">Red king crab</span> Species of crustacean

The red king crab, also called Kamchatka crab or Alaskan king crab, is a species of king crab native to cold waters in the North Pacific Ocean and adjacent seas, but also introduced to the Barents Sea. It grows to a leg span of 1.8 m (5.9 ft), and is heavily targeted by fisheries.

<span class="mw-page-title-main">Environmental impact of fishing</span>

The environmental impact of fishing includes issues such as the availability of fish, overfishing, fisheries, and fisheries management; as well as the impact of industrial fishing on other elements of the environment, such as bycatch. These issues are part of marine conservation, and are addressed in fisheries science programs. According to a 2019 FAO report, global production of fish, crustaceans, molluscs and other aquatic animals has continued to grow and reached 172.6 million tonnes in 2017, with an increase of 4.1 percent compared with 2016. There is a growing gap between the supply of fish and demand, due in part to world population growth.

<span class="mw-page-title-main">Alaska pollock</span> Species of fish

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<span class="mw-page-title-main">Crab fisheries</span> Fisheries which capture or farm crabs

Crab fisheries are fisheries which capture or farm crabs. True crabs make up 20% of all crustaceans caught and farmed worldwide, with about 1.4 million tonnes being consumed annually. The horse crab, Portunus trituberculatus, accounts for one quarter of that total. Other important species include flower crabs, snow crabs (Chionoecetes), blue crabs, edible or brown crabs, Dungeness crab, and mud crabs, each of which provides more than 20,000 tonnes annually.

This page is a list of fishing topics.

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<i>Paralithodes platypus</i> Species of crustacean

Paralithodes platypus, the blue king crab, is a species of king crab from cold waters in the North Pacific Ocean and adjacent seas. Although blue king crabs are among the largest crabs in the world and reputedly may exceed 18 pounds (8.2 kg) in weight, they are generally smaller than red king crabs.

<i>Chionoecetes opilio</i> Species of crab

Chionoecetes opilio, a species of snow crab, also known as opilio crab or opies, is a predominantly epifaunal crustacean native to shelf depths in the northwest Atlantic Ocean and north Pacific Ocean. It is a well-known commercial species of Chionoecetes, often caught with traps or by trawling. Seven species are in the genus Chionoecetes, all of which bear the name "snow crab". C. opilio is related to C. bairdi, commonly known as the tanner crab, and other crab species found in the cold, northern oceans.

The North Pacific Fishery Management Council (NPFMC) is one of eight regional councils established by the Magnuson–Stevens Fishery Conservation and Management Act in 1976 to manage the fisheries of the United States. With jurisdiction over the 900,000-square-mile (2,300,000 km2) Exclusive Economic Zone (EEZ) off Alaska, the Council has primary responsibility for groundfish management in the Gulf of Alaska, Bering Sea and Aleutian Islands, including cod, pollock, flatfish, mackerel, sablefish, and rockfish species. Other large Alaska fisheries such as salmon, crab and herring are managed primarily by the State of Alaska.

References

  1. "Chionoecetes bairdi". Integrated Taxonomic Information System.
  2. NOAA Fisheries 150th Anniversary: Mary Jane Rathbun
  3. 1 2 Wildlife Notebook: Tanner Crab Alaska Department of Fish and Game
  4. Phillips, Bruce F. (2006). Lobsters: Biology, Management, Aquaculture and Fisheries (PDF). Oxford, UK ; Ames, Iowa: Blackwell Pub. p. 162. ISBN   1-4051-2657-4.
  5. Amy Carroll. "Alaska's Crab Fishery: Big Money Days are Gone". Alaska Department of Fish and Game, Division of Wildlife Conservation.
  6. Ned Rozell (October 25, 2001). "Northeast wind favors Bristol Bay crabs". Alaska Science Forum, University of Alaska Fairbanks. Archived from the original on June 14, 2010. Retrieved October 10, 2010.