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 Temperature selection and the final thermal preferendum of snow crab (Chionoecetes opilio, Decapoda) from the Barents Sea

Polar Biology ◽  
2019 ◽  
Vol 42 (10) ◽  
pp. 1911-1914 ◽  
Author(s):  
Sten Ivar Siikavuopio ◽  
Snorre Bakke ◽  
Bjørn Steinar Sæther ◽  
Tina Thesslund ◽  
Jørgen S. Christiansen
Keyword(s):  
Barents Sea ◽  
Snow Crab ◽  
Temperature Selection ◽  
Chionoecetes Opilio ◽  
The Barents Sea

scholarly journals Taxonomic and genetic confirmed findings of snow crab (Chionoecetes opilio) larvae in the Barents Sea

Polar Biology ◽  
2021 ◽  
Author(s):  
Ann Merete Hjelset ◽  
Hanna Ellerine Helle Danielsen ◽  
Jon-Ivar Westgaard ◽  
Ann-Lisbeth Agnalt
Keyword(s):  
Barents Sea ◽  
Cold Water ◽  
Genetic Identification ◽  
Snow Crab ◽  
Temporal And Spatial Distribution ◽  
Crab Larva ◽  
Chionoecetes Opilio ◽  
Larval Stages ◽  
Research Survey ◽  
The Barents Sea

AbstractThe snow crab (Chionoecetes opilio) is an Arctic cold-water species native to the northwestern Atlantic Ocean and the northern Pacific Ocean. During the recent decades, a population has established in the Barents Sea. Several aspects of the snow crabs’ biology in this area have not been described, including time of hatching, intermoult duration of the different larval stages and larval distribution. Insight into the early-life stages might increase the understanding of the population's dynamics and further spreading in the Barents Sea as well as inform basis for making monitoring and management decisions. The present study investigated the presence and developmental stage of snow crab larva in plankton samples obtained in the central Barents Sea during a research survey in June and July 2019. Presence of snow crab larvae was confirmed through taxonomic and genetic identification. All larvae were identified as zoea I, which gives an indication of the timing of the hatching period. Morphological measurements coincide well with those reported in studies from the species native distribution range. No larvae of native Hyas spp. were found and overlap in temporal and spatial distribution is discussed. The study provides important information for development of further research into the biology of the snow crab in the Barents Sea.

scholarly journals The effect of white and green LED-lights on the catch efficiency of the Barents Sea snow crab (Chionoecetes opilio) pot fishery

PLoS ONE ◽  
2021 ◽  
Vol 16 (10) ◽  
pp. e0258272
Author(s):  
Kristine Cerbule ◽  
Bent Herrmann ◽  
Eduardo Grimaldo ◽  
Leif Grimsmo ◽  
Jørgen Vollstad
Keyword(s):  
Field Experiments ◽  
Barents Sea ◽  
Carapace Width ◽  
Snow Crab ◽  
Chionoecetes Opilio ◽  
Light Emitting ◽  
Green Led ◽  
Minimum Landing Size ◽  
White Light Emitting Diodes ◽  
Led Lights

In commercial snow crab (Chionoecetes opilio) fishery, the catch efficiency of the conical pots is important for increasing the profitability of the industry. This study evaluated the effect of adding green and white light emitting diodes (LED) on the catch efficiency of commercially used conical pots. The results from the field experiments showed that inserting artificial lights significantly increases the catch efficiency for snow crab over the minimum landing size of 95 mm carapace width of up to 76% when using green LED, and by 52–53% on average when using white LED. This study shows that it is possible to improve the catch efficiency of the snow crab fishery by applying artificial LED lights to the conical snow crab pots, potentially resulting in an important economic benefit to the snow crab fishery.

scholarly journals Combining data from different sampling methods to study the development of an alien crab Chionoecetes opilio invasion in the remote and pristine Arctic Kara Sea

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7952
Author(s):  
Anna K. Zalota ◽  
Olga L. Zimina ◽  
Vassily A. Spiridonov
Keyword(s):  
Population Growth ◽  
Barents Sea ◽  
Kara Sea ◽  
High Density ◽  
Yamal Peninsula ◽  
Snow Crab ◽  
Chionoecetes Opilio ◽  
The Barents Sea ◽  
Crab Population ◽  
Size Groups

Data obtained using three different types of sampling gear is compared and combined to assess the size composition and density of a non-indigenous snow crab population Chionoecetes opilio in the previously free of alien species Kara Sea benthos. The Sigsbee trawl has small mesh and catches even recently settled crabs. The large bottom trawl is able to catch large crabs, but does not retain younger crabs, due to its large mesh. Video sampling allows the observation of larger crabs, although some smaller crabs can also be spotted. The combined use of such gear could provide full scope data of the existing size groups in a population. The density of the crabs was calculated from the video footage. The highest figures were in Blagopoluchiya Bay at 0.87 crabs/m2, where the settlement seems to be reaching its first peak of population growth after the introduction. High density in the Kara Gates Strait at 0.55 crabs/m2, could be due to the close proximity of the Barents Sea from where the crabs can enter by both larval dispersal and active adult migration. All size groups have been present in most sampled areas, which suggest successful settlement and growth of crabs over a number of years. Again, this was not the case in Blagopoluchiya Bay with high density of small crabs (<30 mm CW), which confirms its recent population growth. Male to female ratio was strikingly different between the bays of the Novaya Zemlya Archipelago and west of the Yamal Peninsula (0.8 and 3.8 respectively). Seventy five ovigerous females were caught in 2016, which confirms the presence of a reproducing population in the Kara Sea. The spatial structure of the snow crab population in the Kara Sea is still in the process of formation. The presented data indicates that this process may lead to a complex system, which is based on local recruitment and transport of larvae from the Barents Sea and across the western Kara shelf; formation of nursery grounds; active migration of adults and their concentration in the areas of the shelf with appropriate feeding conditions.

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