scholarly journals Current Status of the Red King Crab (Paralithodes camtchaticus) and Snow Crab (Chionoecetes opilio) Industries in Norway

2017 ◽  
Vol 26 (1) ◽  
pp. 42-54 ◽  
Author(s):  
Grete Lorentzen ◽  
Gøril Voldnes ◽  
Ragnhild D. Whitaker ◽  
Ingrid Kvalvik ◽  
Birthe Vang ◽  
...  
Keyword(s):  
Current Status ◽  
Snow Crab ◽  
Red King Crab ◽  
King Crab ◽  
Chionoecetes Opilio

scholarly journals Climate change and the future productivity and distribution of crab in the Bering Sea

2020 ◽  
Author(s):  
Cody Szuwalski ◽  
Wei Cheng ◽  
Robert Foy ◽  
Albert J Hermann ◽  
Anne Hollowed ◽  
...  
Keyword(s):  
Bering Sea ◽  
Ice Cover ◽  
The United States ◽  
The Arctic ◽  
Snow Crab ◽  
Red King Crab ◽  
Potential Productivity ◽  
Environmental Indices ◽  
King Crab ◽  
Tanner Crab

Abstract Crab populations in the eastern Bering Sea support some of the most valuable fisheries in the United States, but their future productivity and distribution are uncertain. We explore observed changes in the productivity and distribution for snow crab, Tanner crab, and Bristol Bay red king crab. We link historical indices of environmental variation and predator biomass with observed time series of centroids of abundance and extent of crab stock distribution; we also fit stock–recruit curves including environmental indices for each stock. We then project these relationships under forcing from global climate models to forecast potential productivity and distribution scenarios. Our results suggest that the productivity of snow crab is negatively related to the Arctic Oscillation (AO) and positively related to ice cover; Tanner crab’s productivity and distribution are negatively associated with cod biomass and sea surface temperature. Aspects of red king crab distribution and productivity appear to be related to bottom temperature, ice cover, the AO, and/or cod biomass. Projecting these relationships forward with available forecasts suggests that Tanner crab may become more productive and shift further offshore, red king crab distribution may contract and move north, and productivity may decrease for snow crab as the population contracts northward.

scholarly journals The visual estimation of red king crab and snow crab viability during transportation

Trudy VNIRO ◽  
2018 ◽  
Vol 172 ◽  
pp. 184-197
Author(s):  
D. S. Zagorskaya ◽  
◽  
I. A. Zagorskij ◽  
N. P. Kovatcheva ◽  
R. R. Borisov ◽  
...  
Keyword(s):  
Snow Crab ◽  
Red King Crab ◽  
Visual Estimation ◽  
King Crab

scholarly journals Chitosan Technology from Crustacean Shells of the Northern Seas

2020 ◽  
Author(s):  
Vitaliy Novikov ◽  
Svetlana Derkach ◽  
Irina Konovalova
Keyword(s):  
Barents Sea ◽  
Raw Materials ◽  
Alkaline Solutions ◽  
Snow Crab ◽  
Crab Shell ◽  
Main Method ◽  
King Crab ◽  
Chionoecetes Opilio ◽  
Chemical Reagents ◽  
Chitin And Chitosan

Technological schemes for the production of chitin and chitosan from the crustaceans of the Barents Sea have been developed. We used shells of king crab (Paralithodes camtschaticus) and snow crab (Chionoecetes opilio) as chitin-containing raw materials, which are waste from the processing of crabs and contain 5.5 and 4.9 wt.% chitin, respectively. Technological schemes are developed taking into account the chemical composition of the used raw materials containing a large amount of residual protein (up to 26 wt.% in the king crab shell) and mineral substances (up to 17 wt.% in the snow crab shell). A chemical method for chitin production has been used. The technological scheme includes the stages of the first deproteinization, demineralization, the second deproteinization and depigmentation of the raw materials using chemical reagents - acids, alkalis, etc. The deacetylation reaction in an alkaline medium was used as the main method for chitosan production from chitin. Technological solutions have been found to significantly reduce the consumption of alkali, to form a circuit of alkaline solutions. This leads to the reduction of pollution of wastewater generated during the production of chitin and chitosan. The resulting polysaccharide chitosan has a degree of deacetylation of 80–85%. Such a product is considered as a valuable ingredient for high-quality functional foods.

scholarly journals Managing harvest risk with catch-pooling cooperatives

2012 ◽  
Vol 69 (6) ◽  
pp. 1038-1044 ◽  
Author(s):  
Suresh Andrew Sethi ◽  
Michael Dalton ◽  
Ray Hilborn
Keyword(s):  
Bering Sea ◽  
Statistical Properties ◽  
Snow Crab ◽  
Red King Crab ◽  
Marine Science ◽  
Case Scenario ◽  
King Crab ◽  
Management Agency ◽  
Using Data ◽  
Central Management

Abstract Sethi, S. A., Dalton, M., and Hilborn, R. 2012. Managing harvest risk with catch-pooling cooperatives – ICES Journal of Marine Science, 69: 1038–1044. Catch-pooling cooperatives are a strategy for fishers to manage variability which can be organized independently of a central management agency. We examined the statistical properties of equal-share catch-pooling cooperatives, and tested their potential to mitigate risk using data from two Bering Sea crab fisheries prior to rationalization. The results suggest that small cooperatives of crabbers could have reduced vessel-level catch risk by as much as 40% in the red king crab fishery, but would have been ineffective in the snow crab fishery. Analytical examination of catch variances under cooperatives explains the discrepancy between the two fisheries and demonstrates that variability reduction depends on the degree of correlation amongst participants' catches. In the best-case scenario, catch-pooling cooperatives can diversify away all season to season variation resulting from individuals' luck and skill, leaving only variation in fishery-wide harvest.

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