Process of deterioration of a kelp (Ecklonia bicyclis Kjellman) bed as a result of grazing by the sea urchin Mesocentrotus nudus (Agassiz) in Shizugawa Bay in northeastern Honshu, Japan

2018 ◽  
Vol 31 (1) ◽  
pp. 599-605 ◽  
Author(s):  
Y. Agatsuma ◽  
S. Takagi ◽  
E. Inomata ◽  
M. N. Aoki
Keyword(s):  
Sea Urchin ◽  
Mesocentrotus Nudus

Effects of Anti-Fouling System (AFS) on embryos of a sea urchin, Mesocentrotus nudus

2019 ◽  
Vol 37 (3) ◽  
pp. 389-395
Author(s):  
Jin-Young Seo ◽  
Jung Hoon Kang ◽  
Jin-Woo Choi
Keyword(s):  
Sea Urchin ◽  
Mesocentrotus Nudus

Respiration of the sea urchin Mesocentrotus nudus in response to large temperature fluctuations

2019 ◽  
Vol 144 ◽  
pp. 178-185 ◽  
Author(s):  
Eunchong Sin ◽  
Won Gi Min ◽  
Yun-Bae Kim ◽  
Tae Won Kim
Keyword(s):  
Sea Urchin ◽  
Temperature Fluctuations ◽  
Large Temperature ◽  
Mesocentrotus Nudus

Influence of the 2011 Tohoku tsunami on the genetic structure of wild sea urchin ( Mesocentrotus nudus ) populations in Sanriku, Japan

2020 ◽  
Vol 41 (2) ◽  
Author(s):  
Kenta Adachi ◽  
Takuya Suzuki ◽  
Sei‐ichi Okumura ◽  
Shohei Funayama ◽  
Shunsuke Moriyama
Keyword(s):  
Genetic Structure ◽  
Sea Urchin ◽  
2011 Tohoku Tsunami ◽  
Mesocentrotus Nudus ◽  
Tohoku Tsunami

Consumption of the edible sea urchin Mesocentrotus nudus attenuates body weight gain and hepatic lipid accumulation in mice

2018 ◽  
Vol 47 ◽  
pp. 40-47 ◽  
Author(s):  
Ryoko Yamamoto ◽  
Hisanori Minami ◽  
Hiromi Matsusaki ◽  
Mami Sakashita ◽  
Naoki Morita ◽  
...  
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Sea Urchin ◽  
Lipid Accumulation ◽  
Body Weight Gain ◽  
Hepatic Lipid ◽  
Hepatic Lipid Accumulation ◽  
Mesocentrotus Nudus

Gonadal production and quality in the sea urchin Mesocentrotus nudus fed a high-protein concentrated red alga Pyropia yezoensis

Aquaculture ◽  
2016 ◽  
Vol 454 ◽  
pp. 184-191 ◽  
Author(s):  
Eri Inomata ◽  
Yuko Murata ◽  
Toshiyuki Matsui ◽  
Yukio Agatsuma
Keyword(s):  
Sea Urchin ◽  
Red Alga ◽  
High Protein ◽  
Pyropia Yezoensis ◽  
Mesocentrotus Nudus

scholarly journals Identification of Sex-Specific Markers Through 2b-RAD Sequencing in the Sea Urchin (Mesocentrotus nudus)

2021 ◽  
Vol 12 ◽  
Author(s):  
Zhouping Cui ◽  
Jian Zhang ◽  
Zhihui Sun ◽  
Bingzheng Liu ◽  
Chong Zhao ◽  
...  
Keyword(s):  
Sex Determination ◽  
Sea Urchin ◽  
Sex Differentiation ◽  
Pcr Amplification ◽  
Open Reading Frames ◽  
Genome Survey ◽  
A Genome ◽  
Mesocentrotus Nudus ◽  
Female Specific ◽  
Determination Mechanism

Sex-specific markers play an important role in revealing sex-determination mechanism. Sea urchin (Mesocentrotus nudus) is an economically important mariculture species in several Asian countries and its gonads are the sole edible parts for people. However, growth rate and immunocompetence differ by sex in this species, sex-specific markers have not been identified, and the sex-determination mechanism of sea urchin remains undetermined. In this study, type IIB endonuclease restriction-site associated DNA sequencing (2b-RAD-seq) and a genome survey of M. nudus were performed, and three female-specific markers and three female heterogametic single nucleotide polymorphism (SNP) loci were identified. We validated these sex-specific markers via PCR amplification in a large number of individuals, including wild and artificially bred populations. Several open reading frames (ORFs) were predicted, although there are no potential genes known for sex determination and sex differentiation within the scaffold in which the sex-specific markers are located. Importantly, the female-specific sequences and female heterozygous SNP loci indicate that a female heterogametic and male homogametic ZW/ZZ sex-determination system should exist in M. nudus. The results provide a solid basis for revealing the sex-determination mechanism of this species, and open up new possibilities for developing sex-control breeding in sea urchin.

scholarly journals The Structure and Function of Gut Microbiomes of Two Species of Sea Urchins, Mesocentrotus nudus and Strongylocentrotus intermedius, in Japan

2021 ◽  
Vol 8 ◽  
Author(s):  
Alfabetian Harjuno Condro Haditomo ◽  
Masanori Yonezawa ◽  
Juanwen Yu ◽  
Sayaka Mino ◽  
Yuichi Sakai ◽  
...  
Keyword(s):  
Sea Urchin ◽  
Gut Microbiome ◽  
Environmental Changes ◽  
Growth Promotion ◽  
Sea Urchins ◽  
The Body ◽  
Sequence Variant ◽  
Strongylocentrotus Intermedius ◽  
Running Water ◽  
Mesocentrotus Nudus

Sea urchin is an indicator of coastal environmental changes in the global warming era, and is also a model organism in developmental biology and evolution. Due to the depletion of wild resources, new aquaculture techniques for improving stocks have been well studied. The gut microbiome shapes various aspects of a host’s physiology. However, these microbiome structures and functions on sea urchins, particularly Mesocentrotus nudus and Strongylocentrotus intermedius which are important marine bioresources commonly found in Japan, have not been fully investigated yet. Using metagenomic approaches including meta16S and shotgun metagenome sequencings, the structures, functions, and dynamics of the gut microbiome of M. nudus and S. intermedius, related to both habitat environment and host growth, were studied. Firstly, a broad meta16S analysis revealed that at the family level, Psychromonadaceae and Flavobacteriaceae reads (38–71%) dominated in these sea urchins, which is a unique feature observed in species in Japan. Flavobacteriaceae reads were more abundant in individuals after rearing in an aquarium with circulating compared to one with running water. Campylobacteraceae and Vibrionaceae abundances increased in both kinds of laboratory-reared sea urchins in both types of experiments. 2-weeks feeding experiments of M. nudus and S. intermedius transplanted from the farm to laboratory revealed that these gut microbial structures were affected by diet rather than rearing environments and host species. Secondly, further meta16S analysis of microbial reads related to M. nudus growth revealed that at least four Amplicon Sequence Variant (ASV) affiliated to Saccharicrinis fermentans, which is known to be a nitrogen (N2) fixing bacterium, showed a significant positive correlation to the body weight and test diameter. Interestingly, gut microbiome comparisons using shotgun metagenome sequencing of individuals showing higher and lower growth rates revealed a significant abundance of “Nitrate and nitrite ammonification” genes in the higher-grown individuals under the circulating water rearing. These findings provide new insights on the structure-function relationship of sea urchin gut microbiomes beyond previously reported nitrogen fixation function in sea urchin in 1950s; we discovered a nitrate reduction function into ammonium for the growth promotion of sea urchin.

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