mitten crabs
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2022 ◽  
Vol 8 ◽  
Author(s):  
Christopher J. Coates ◽  
Andrew F. Rowley

While most crab production for human consumption worldwide comes from capture fisheries, there is increasing production of selected species using aquaculture-based methods. This is both for the purpose of stock replacement and direct yield for human consumption. Disease has limited the ability to produce larval crabs in commercial hatcheries and this together with suitable feeds, are major hurdles in the sustainable development of cultivation methods. Juvenile and adult crabs are also subject to a range of diseases that can cause severe economic loss. Emerging pathogens/parasites are of major importance to crab aquaculture as they can cause high levels of mortality and are difficult to control. Diseases caused by viruses and bacteria receive considerable attention but the dinoflagellate parasites, Hematodinium spp., also warrant concern because of their wide host range and lack of control methods to limit their spread. This concise review examines the emerging diseases in several crabs that have been selected as candidates for aquaculture efforts including Chinese mitten crabs (Eriocheir sinensis), mud crabs (Scylla spp.), swimming crabs (Portunus spp.), blue crabs (Callinectes sapidus) and shore crabs (Carcinus maenas). The latter is also a prolific invasive species known to harbour diverse macro- and micro-parasites that can affect commercially important bivalves and crustaceans.


Fishes ◽  
2022 ◽  
Vol 7 (1) ◽  
pp. 11
Author(s):  
Junren Xue ◽  
Tao Jiang ◽  
Xiubao Chen ◽  
Hongbo Liu ◽  
Jian Yang

The authentication of high-quality fishery products originating from specific geographical regions is urgently needed worldwide. Chinese mitten crabs (Eriocheir sinensis), originating from Yangcheng Lake, are prime counterfeiting targets for the same reasons. Foreign crabs that are cultured briefly in the lake, known as “bathed” crabs, are illegally marketed as natives, negatively impacting the product quality. To establish a method for distinguishing “bathed” and genuine crabs, in this paper we conduct a comparative investigation by an Agilent 7500ce ICP-MS on multi-mineral element profiling of the third pereiopod from genuine and one month deliberately “bathing” cultured crabs. The profiles of 11 elements were significantly different between the genuine and foreign crabs before and after bathing. The discriminant analysis reached 100% accuracy to separate the genuine and “bathed” crabs into different groups. Bathing culture was unable to converge element profiles between the genuine and foreign crabs. The biogeochemical profiles can be effective for distinguishing “bathed” crabs.


2021 ◽  
Vol 18 (23) ◽  
pp. 6287-6300
Author(s):  
Alex R. Quijada-Rodriguez ◽  
Pou-Long Kuan ◽  
Po-Hsuan Sung ◽  
Mao-Ting Hsu ◽  
Garett J. P. Allen ◽  
...  

Abstract. Dissolution of anthropogenic CO2 is chronically acidifying aquatic ecosystems. Studies indicate that ocean acidification will cause marine life, especially calcifying species, to suffer at the organism and ecosystem levels. In comparison, freshwater acidification has received less attention, rendering its consequences unclear. Here, juvenile Chinese mitten crabs, Eriocheir sinensis, were used as a crustacean model to investigate the impact of CO2-mediated freshwater acidification. Our integrative approach, investigating changes in the animal's acid–base homeostasis, metabolism, calcification, locomotory behaviour, and survival rate, indicates that this economically relevant crustacean will face energetic consequences from future freshwater acidification. These energetic trade-offs allow the animal to maintain its acid–base homeostasis at the cost of reduced metabolic activity, exoskeletal calcification, and locomotion, reducing the animal's overall fitness and increasing its mortality. Results indicate that present-day Chinese mitten crab could be heavily affected by freshwater acidification like their marine counterparts and emphasize the importance of understanding the long-term implications of freshwater acidification on species' fitness.


2021 ◽  
pp. 110914
Author(s):  
Long Zhang ◽  
Ning-Ping Tao ◽  
Xugan Wu ◽  
Xichang Wang

2021 ◽  
Author(s):  
Weiwei Ma ◽  
Chenyang Ren ◽  
Qingbiao Hu ◽  
Xiaodong Li ◽  
Yali Feng ◽  
...  

Abstract Avian influenza virus (AIV) possessed significant risk to various animals and human health. Wild birds, especially waterfowls are considered to be the natural reservoir of AIVs. The ecology of AIV is still far from being fully understood. Chinese mitten crabs are nonnegligible biotic factor in AIV ecosystem. We analyzed the ability of Chinese mitten crabs accumulate and spread AIV. We found that AIV remain infectious in water only for 36 hours but persist in crabs for 48 hours. Crabs grills and gastrointestinal tracts accumulated AIV with higher titers than viral water. Crabs could accumulate AIV from contaminated water, carry the virus and spread to naïve crabs via surrounding water. Our study identified Chinese mitten crab as a novel transmission vehicle in AIV ecosystem.


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