freshwater shrimp
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Aquaculture ◽  
2022 ◽  
pp. 737916
Author(s):  
Phillipe Thiago Leite Barbosa ◽  
Jayme Aparecido Povh ◽  
Karine Nathiele Nogueira Farias ◽  
Tiago Venâncio da Silva ◽  
Gabrielly Cristina Teodoro ◽  
...  

2021 ◽  
Vol 43 (4) ◽  
pp. 45-54
Author(s):  
Phan Thi Yen ◽  
Werner Klotz ◽  
Thomas von Rintelen ◽  
Dang Van Dong ◽  
Do Van Tu

The freshwater shrimp species Caridina cucphuongensis (family Atyidae) was poorly described by Dang (1980). Moreover, the taxonomic status of this species is hard to verify as the types have been lost. This study provides a redescription of the species and designation of a neotype specimen. The Caridina cucphuongensis Dang, 1980 is characterized by short rostrum with large teeth on the dorsal margin, long stylocerite, subrectangular endopod of male first pleopod, and short appendix interna of the male second pleopod.


2021 ◽  
Vol 50 (0) ◽  
pp. 151-163
Author(s):  
Aloun Kounthongbang ◽  
Pany Souliyamath ◽  
Phonenaphet Chanthasone ◽  
Phutsamone Phommachan ◽  
Oulaytham Lasasimma ◽  
...  

Micron ◽  
2021 ◽  
pp. 103162
Author(s):  
A. Ostróżka ◽  
Z. Tiffert ◽  
G. Wilczek ◽  
M. Rost-Roszkowska

2021 ◽  
Author(s):  
Chuan‐jiang Zhou ◽  
Meng‐xia Feng ◽  
Yong‐tao Tang ◽  
Chang‐xing Yang ◽  
Xiao‐lin Meng ◽  
...  

Zootaxa ◽  
2021 ◽  
Vol 4999 (3) ◽  
pp. 228-242
Author(s):  
DO VAN TU ◽  
DANG VAN DONG ◽  
THOMAS VON RINTELEN

A new species of atyid freshwater shrimp is described from two caves of Bac Kan Province, Northeast Vietnam, namely Caridina namdat sp. nov. This species can be distinguished from its congeners by a suite of morphological characters such as reduced eyes with short eyestalk, very short and unarmed rostrum, slender second pereiopod, elongated endopod of male first pleopod, and long appendix interna of the male second pleopod. Molecular phylogenetic data from the mitochondrial cytochrome oxidase subunit I (COI) and 16S ribosomal RNA genes also support the distinctiveness of the new species from all other examined species.


Author(s):  
Kristina Klein ◽  
Sebastian Heß ◽  
Sandra Nungeß ◽  
Ulrike Schulte-Oehlmann ◽  
Jörg Oehlmann

AbstractThe ingestion of microplastics (MPs) is well documented for various animals and spherical MPs (beads) in many studies. However, the retention time and egestion of MPs have been examined less, especially for irregular MPs (fragments) which are predominantly found in the environment. Furthermore, the accumulation of such particles in the gastrointestinal tract is likely to determine whether adverse effects are induced. To address this, we investigated if the ingestion and egestion of beads are different to those of fragments in the freshwater shrimp Neocaridina palmata. Therefore, organisms were exposed to 20–20,000 particles L−1 of either polyethylene (PE) beads (41 μm and 87 μm) or polyvinyl chloride (PVC) fragments (<63 μm). Moreover, shrimps were exposed to 20,000 particles L−1 of either 41 μm PE and 11 μm polystyrene (PS) beads or the PVC fragments for 24 h, followed by a post-exposure period of 4 h to analyze the excretion of particles. To simulate natural conditions, an additional fragment ingestion study was performed in the presence of food. After each treatment, the shrimps were analyzed for retained or excreted particles. Our results demonstrate that the ingestion of beads and fragments were concentration-dependent. Shrimps egested 59% of beads and 18% of fragments within 4 h. Particle shape did not significantly affect MP ingestion or egestion, but size was a relevant factor. Medium- and small-sized beads were frequently ingested. Furthermore, fragment uptake decreased slightly when co-exposed to food, but was not significantly different to the treatments without food. Finally, the investigations highlight that the assessment of ingestion and egestion rates can help to clarify whether MPs remain in specific organisms and, thereby, become a potential health threat.


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