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Lateral (A) and dorsal (B) views of a male Cherax quadricarinatus captured in Pok Fu Lam Country Park, Hong Kong SAR, China.

Lateral (A) and dorsal (B) views of a male Cherax quadricarinatus captured in Pok Fu Lam Country Park, Hong Kong SAR, China.

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Invasive freshwater crayfish are spreading rapidly across the world. Here, we report the first record of Australian redclaw crayfish, Cherax quadricarinatus (von Martens, 1868) in Hong Kong, China. Identification of the captured crayfish was confirmed using external morphological features and molecular analyses. A total of 49 crayfish were captured...

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... total of 49 crayfish were captured from 4 sampling occasions (Supplementary material Table S1). The captured crayfish were identified as Australian redclaw crayfish, Cherax quadricarinatus (von Martens, 1868), (Figure 2) based on morphological characteristics and DNA barcoding. All eight sequences matched with the C. quadricarinatus sequences in Genbank, with similarity values ranging from 99% to 100% (Genbank Accession number: KY745779.1 and KX377348.1). ...

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... Each variable is evaluated on a scale of "0 to 20", where "0" represents the poorest or most altered condition of the variable and "20" the most optimal or healthy condition. For variables marked with "*", each margin is evaluated separately (values of 1-10), and their combined score reflects the total score (values of [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The IIBAMA (values of 0-24) is the sum of the variables RT, EPT, II, IT, MT, and FT. ...
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Crustaceans are among the most successful taxonomic groups in invasions worldwide. Humans can facilitate these invasions through introductions and disturbances in habitats. The Australian redclaw crayfish (Cherax quadricarinatus) is an invasive species with significant global ecosystem impacts. This species inhabits the Sierra Gorda Biosphere Reserve, in the Central Mexican Plateau. We hypothesize that environmental degradation facilitates the establishment and expansion of invasive crayfish. Seven sites along the Santa María River, within the reserve buffer zone, were assessed for seven months in 2023. We analyzed the abundance and density of the Australian redclaw crayfish in correlation with the environmental quality of the habitat. The results confirm that the establishment and spread of crayfish populations are related to water quality degradation and habitat alteration. The associated variables include increased total dissolved solids, greater substrate embedment, and degraded conditions on stream banks. Furthermore, the inverse relationship between the abundance of Australian redclaw crayfish and macroinvertebrate richness reinforces the hypothesis that more diverse native communities reduce the success of invaders. This study highlights the urgent need to implement management strategies focused on habitat restoration and the control of reproductive populations through the extirpation of mature individuals as critical measures for controlling the establishment and expansion of the invasive Australian redclaw crayfish.
... Australian redclaw crayfish (Cherax quadricarinatus (von Martens, 1868)) is a species of freshwater crayfish from family Parastacidae that first originated from Australia and New Guinea (Austin, 1996;Bláha et al. 2016). The species has spread to many countries worldwide (Haubrock et al. 2021) including Malaysia (Naguib et al. 2021;Naqiuddin et al. 2016;Norshida et al. 2021), Indonesia (Akmal et al. 2021;Patoka et al. 2018Patoka et al. , 2016Wicaksono, Mashar & Wardiatno 2021), China (Yau & Lau 2021), United States (Morningstar et al. 2020), Mexico (Tapia-Varela et al. 2020), Puerto Rico (Macias, Torres & Colon-Gaud 2021), Martinique Islands (Baudry et al. 2020), Africa (Maurice et al. 2019;Madzivanzira et al. 2020), and even Europe (Arias & Torralba-Burrial 2021;Weiperth et al. 2019). The species is therefore well-known to be a successful invasive species in the tropics and subtropics (Haubrock et al. 2021), and new established population has been recently discovered within Malaysia territory . ...
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Cherax quadricarinatus (von Martens, 1868) is a highly invasive species that is resilient and highly adaptable to environmental conditions in new locations. Its presence brings along ecosystem imbalances and causes socioeconomic losses in invaded areas. Due to the destructive behaviour, it is important to conduct preliminary assessment methods and scientific studies especially on its behavioural and dispersal patterns. Thus, this study aims to determine the habitat distribution patterns of C. quadricarinatusbased on the methods of GIS and environmental DNA (eDNA) analysis. The study was done at Felda Tenang, Terengganu, Malaysia. Based on the geographical features and climate conditions of the study area, we theorized that there are fewer and older C. quadricarinatuspresent at higher areas but more and younger C. quadricarinatus at lower areas. We found that 91.67% of the study area to be invaded, thus imploring the need for future mitigation plans to curb their dispersal into new areas. Future studies should also be done to determine the habitat distribution patterns of C. quadricarinatus in other areas.
... In Asia region, the presence of redclaws' wild population was reported in Malaysia (Naqiuddin et al.2016;Norshida et al. 2021), Indonesia (Patoka et al. 2016), Singapore (Ahyong andYeo, 2007;Belle and Yeo, 2010), Thailand (Chaichana and Wanjit, 2017) and China (Lau and Yau, 2020). ...
... In China, wild population of C. quadricarinatus were documented in Hong Kong by Lau and Yau (2020). A total of 49 crayfish were detected and caught from a stream pool and reservoir in Pok Fu Lam Country Park. ...
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The redclaw crayfish (Cherax quadricarinatus) is an aquatic species native to the northern Australia and southern New Guinea. The invasion of this species worldwide was mainly associated with the aquaculture activities, ornamental pet trading and deliberate or unintentional release into the wild. This review highlighted the first report, distribution and route of introduction of C. quadricanatus worldwide. We also include brief discussion of the region where the crayfish were detected. In this review, we realized most of the invasion of this species mainly started with aquaculture activity and farming which open the opportunity for others possibilities of escape. C. quadricarinatus capabilities of surviving in different regions and wide range of environment were briefly discussed in this review. The impacts of invasion were compiled according to the reported research articles.
Article
Purpose. To compile scientific sources on the biology, ecology, reproduction and rearing of the Australian red-claw crayfish Cherax quadricarinatus, to identify the main areas of research related to the distribution, feeding and impact of this species on the ecosystem. Methodology. The methodology for compiling the thematic bibliography was based on a thorough search, systematisation and analysis of scientific sources. Findings. The work resulted in the collection, systemization, and analyzis of a significant amount of literature covering the biological, ecological and economic aspects of the Australian red-claw crayfish Cherax quadricarinatus. The bibliography contains 154 publications, placed in alphabetical order and described in accordance with the requirements of the HAC, in accordance with DSTU 8302:2015 «Information and documentation. Bibliographic reference. General provisions and rules of drafting», taking into account the amendments (UKND code 01.140.40). Practical Value. The list can be useful for students, teachers and researchers to access relevant publications for use in the educational process and research. Keywords: aquaculture, Cherax quadricarinatus, distribution area, reproduction, ecdysis, morphometric analysis.