Video — World’s Deadliest: Shrimp Packs a Punch — National Geographic and Alaska Shrimp Fisheries Management

Mantis shrimp  orstomatopods  are marinecrustaceans, the members of the  orderStomatopoda.They may reach 30 centimetres (12  in) in length, although exceptional cases of up to 38  cm (15  in) have been recorded.      https://en.wikipedia.org/wiki/Mantis_shrimp

 

via Video — World’s Deadliest: Shrimp Packs a Punch — National Geographic.

 

Amazing!  This video demonstrates the treacherousness of the Mantis shrimp.  We observe the shrimp in pursuit of a crab. First, not only is the shrimp able to see with hexnocular vision (two eyes with three focal points each), it also has the ability to see in ultraviolet and infrared.

The crab’s attempt to run and hide in a discarded glass was useless as was the choice of refuge.  The Mantis shrimp is shown breaking through the 1/4 ” glass that the crab attempted to hide under with only 2 punches!

Indeed, not only my appreciation for its voraciousness has been altered, my admiration for the beauty of the shrimp as well:

File:Mantis shrimp from front.jpg – Wikipedia, the free encyclopedia.

Although the Mantis shrimp is found mostly  in the  Indian and Pacific Oceans between eastern Africa and Hawaii, and therefore will not be found  in Alaskan waters; here are a few interesting facts about the four types of shrimp found in Alaska waters:

“1) Most Sidestriped shrimp begin their lives as males and become female after a year or two.

2)Spot shrimp have been found over 1,500 feet deep.

3)Northern shrimp move up off the bottom and the water column at night to feed on plankton.

4)Coonstripe shrimp carry as many as 4,000 eggs.

Management of coonstripe shrimp is under the jurisdiction of the State of Alaska for all waters out to 200 miles offshore. Commercial harvests for pot fisheries are managed using guideline harvest ranges (GHR) or levels (GHL) set within discrete areas or districts. GHRs for fishing districts are generally based on historic and recent harvest levels, and are adjusted annually preseason according to stock assessment information compiled by ADF&G staff. These harvest ranges or levels are expressed in terms of the catch of a target species or combination of species. For example, in areas or districts where the GHR is expressed in terms of spot shrimp, the coonstripe shrimp bycatch levels are largely unregulated. The small beam trawl fishery in Southeast Alaska is regulated by specific trip and seasonal bycatch limits to prevent targeting of spot and coonstripe shrimp. Beam trawling in Prince William Sound targets sidestripe shrimp at greater depths where coonstripe shrimp catches are very low or nonexistent.

Shrimp trawl fisheries are managed exclusively by the State of Alaska. Northern shrimp are currently harvested in trawl fisheries only in the western Gulf of Alaska, Prince William Sound, and Southeast Alaska.

Trawl fisheries in western Alaska are managed under the Westward Region Shrimp Management Plan, first approved in 1982. The plan sets minimum biomass thresholds for allowing harvest in some of the historically most productive inshore areas. Guideline harvest levels are set based on catch history from trawl surveys and a voluntary logbook. Other inshore waters are closed to otter and beam trawling. Remaining offshore waters are open by regulation without biomass thresholds or harvest guidelines, but have supported very little fishing since the 1986-87 season.

The Prince William Sound trawl fishery is managed under guideline harvest levels based on trawl surveys in the northwest and historic catches in the southwest. The fishery targets sidestripe shrimp and has a 10% bycatch limit on northern shrimp.

Southeast Alaska trawl fisheries are managed under guideline harvest levels based on historic catches. Fisheries are closed in the spring during the egg-hatching period. Multiple fishing periods are established to spread out harvest over time and take advantage of growth and recruitment. The Southeast trawl fishery has transitioned to targeting mostly sidestripe shrimp, and northern shrimp are taken as bycatch.

The Alaska State Constitution establishes, as state policy, the development and use of replenishable resources, in accordance with the principle of sustained yield, for the maximum benefit of the people of the state. In order to implement this policy for the fisheries resources of the state, the Alaska Legislature created the Alaska  Board of Fisheries  (BOF) and the Alaska Department of Fish and Game (ADF&G).

The BOF was given the responsibility to establish regulations guiding the conservation and development of the state’s fisheries resources, including the distribution of benefits among subsistence, commercial, recreational, and personal uses. The ADF&G was given the responsibility to implement the BOF’s regulations and management plans through the scientific management of the state’s fisheries resources. Scientific and technical advice is also provided by the ADF&G to the BOF during its rule-making process. The separation of rule-making and inseason management responsibilities between these two entities is generally regarded as contributing to the success of Alaska’s fisheries management system.

The ADF&G’s fishery management activities fall into two categories: inseason management and applied science. For inseason management, the department deploys a cadre of fishery managers near the fisheries. These individuals have broad authority to open and close fisheries based on their professional judgment, the most current biological data from field projects, and fishery performance.”  https://www.adfg.alaska.gov (accessed 3/23/13)

 

 

 

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