Motility and fertility of cryopreserved spermatozoa of the Japanese sea cucumber Apostichopus japonicus

2018 ◽  
Vol 50 (1) ◽  
pp. 106-115
Author(s):  
Yuta Mizuno ◽  
Atsushi Fujiwara ◽  
Keisuke Yamano ◽  
Hiromi Ohta
Keyword(s):  
Sea Cucumber ◽  
Apostichopus Japonicus ◽  
Japanese Sea Cucumber

Chromosome number and telomere sequence mapping of the Japanese sea cucumber Apostichopus japonicus

2008 ◽  
Vol 75 (1) ◽  
pp. 249-251 ◽  
Author(s):  
Sei-Ichi Okumura ◽  
Kazuma Kimura ◽  
Mizuho Sakai ◽  
Takashi Waragaya ◽  
Suehiro Furukawa ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Sea Cucumber ◽  
Apostichopus Japonicus ◽  
Sequence Mapping ◽  
Telomere Sequence ◽  
Japanese Sea Cucumber

scholarly journals Predation of Juvenile Japanese Sea Cucumber Apostichopus japonicus by Kelp Crab Pugettia ferox

2021 ◽  
Vol 8 ◽  
Author(s):  
Nobuharu Inaba ◽  
Takuma Matsumoto ◽  
Hiroshi Kawai ◽  
Yuji Anaguchi ◽  
Kohei Matsuno
Keyword(s):  
High Mortality ◽  
Sea Cucumber ◽  
Laboratory Experiments ◽  
Apostichopus Japonicus ◽  
Life Stage ◽  
Early Life Stage ◽  
Food Storage ◽  
Sea Cucumbers ◽  
Commercially Important ◽  
Japanese Sea Cucumber

The predation of commercially important Japanese sea cucumber Apostichopus japonicus by the kelp crab Pugettia ferox, widely distributed in coastal northeast Asia, was examined in field sampling and laboratory experiments. The ossicles of A. japonicus were detected from the stomach contents of a natural population of P. ferox at the rate of 32.4% of 68 individuals collected within artificial intermediate sea cucumber reefs for releasing hatchery-produced juveniles in December 2018. In the following laboratory experiments, a high mortality rate (7.7 ± 2.4 individuals day–1) of juvenile A. japonicus (15.35 ± 2.47 mm) was observed despite the different sizes and sex of P. ferox tested. It was also confirmed that a maximum of five sea cucumbers was killed and cut into small pieces within the first 2 h. Smaller and younger P. ferox individuals (adolescent) between carapace widths of 14.2–17.8 mm actively decorated themselves using pieces of chopped sea cucumber after feeding. Attached pieces of sea cucumber were observed to be fully eaten within a week, suggesting a possible strategy by P. ferox of short-term food storage as well as mimicry. This study demonstrates considerable evidence that predation mortality by sufficiently mobile P. ferox on commercially important A. japonicus can be significant, causing high mortality at the early life stage in the natural environment, especially in areas releasing hatchery-produced juveniles. It is also worth noting that the utilization of freshly chopped sea cucumbers as decoration material and food storage is a unique and novel ecological trait of P. ferox.

Stage-specific distribution of Japanese sea cucumber Apostichopus japonicus in Maizuru Bay, Sea of Japan, in relation to environmental factors

2018 ◽  
Vol 84 (2) ◽  
pp. 251-259 ◽  
Author(s):  
Kenji Minami ◽  
Hideki Sawada ◽  
Reiji Masuda ◽  
Kohji Takahashi ◽  
Hokuto Shirakawa ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Sea Of Japan ◽  
Sea Cucumber ◽  
Apostichopus Japonicus ◽  
Specific Distribution ◽  
Japanese Sea Cucumber
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