Variation in growth performance of Ryukyu-ayu, Plecoglossus altivelis ryukyuensis, inferred from otolith analysis

2018 ◽  
Vol 65 (4) ◽  
pp. 482-487 ◽  
Author(s):  
Iki Murase ◽  
Tatsuya Kawakami ◽  
Kei’ichiro Iguchi
Keyword(s):  
Growth Performance ◽  
Plecoglossus Altivelis ◽  
Otolith Analysis ◽  
Plecoglossus Altivelis Ryukyuensis

scholarly journals Does construction in the spawning ground improve the riverbed conditions making it suitable for spawning of the Ryukyu-ayu Plecoglossus altivelis ryukyuensis?

2020 ◽  
Vol 67 (4) ◽  
pp. 493-501
Author(s):  
Satoshi Awata ◽  
Tetsuya Tsuruta ◽  
Shin-ichiro Abe ◽  
Toshihiko Yonezawa ◽  
Kei’ichiro Iguchi
Keyword(s):  
Spawning Ground ◽  
Plecoglossus Altivelis ◽  
Plecoglossus Altivelis Ryukyuensis

Effects of low fishmeal diets on the growth performance and physiological condition of ayu Plecoglossus altivelis

2016 ◽  
Vol 82 (5) ◽  
pp. 819-826
Author(s):  
Takeshi Yamamoto ◽  
Nobuhiro Suzuki ◽  
Hirofumi Furuita ◽  
Shunji Amano ◽  
Hiromi Oku ◽  
...  
Keyword(s):  
Growth Performance ◽  
Physiological Condition ◽  
Plecoglossus Altivelis

scholarly journals Using environmental DNA analyses to assess the occurrence and abundance of the endangered amphidromous fish Plecoglossus altivelis ryukyuensis

2020 ◽  
Vol 8 ◽  
Author(s):  
Yoshihisa Akamatsu ◽  
Gen Kume ◽  
Masuji Gotou ◽  
Takanori Kono ◽  
Takuma Fujii ◽  
...  
Keyword(s):  
Environmental Dna ◽  
Dna Fragments ◽  
Plecoglossus Altivelis ◽  
Endangered Fish ◽  
Non Invasive ◽  
Plecoglossus Altivelis Ryukyuensis ◽  
Natural Monument ◽  
Conservation Plans ◽  
Three Rivers ◽  
Probe Set

The Ryukyu ayu Plecoglossus altivelis ryukyuensis is an endangered amphidromous fish that inhabits rivers in the Ryukyu Archipelago (Japan). Populations of the species have declined dramatically. Consequently, the Ryukyu ayu has been registered as a natural monument in Japan and monitoring surveys with direct catching are restricted legally. This restriction, unfortunately, makes monitoring of population abundances difficult and creates a barrier to both advancing understanding of the species’ status and the development of appropriate conservation plans. We developed a non-invasive monitoring methodology using eDNA analyses. We designed a specific quantitative PCR assay for the Ryukyu ayu using the mitochondrial ND4 region. Using this primer/probe set, we conducted eDNA analyses in three rivers on Amami-Ohshima Island. The DNA fragments were amplified from the eDNA extracted from natural water in each river. The numbers of DNA fragments detected were positively correlated with individual counts of fish obtained by visual snorkelling surveys. Our method does not contravene restrictions and facilitates abundance monitoring of this endangered fish species.

scholarly journals Microsporidian Infection in Rryukyu Ayu Plecoglossus altivelis ryukyuensis on Amami Oshima Island

2011 ◽  
Vol 46 (3) ◽  
pp. 80-86
Author(s):  
Nobuhisa Niwa ◽  
Atsushi Yamamoto ◽  
Kyosuke Araki ◽  
Takashi Kamaishi ◽  
Akihiko Shinomiya
Keyword(s):  
Plecoglossus Altivelis ◽  
Microsporidian Infection ◽  
Plecoglossus Altivelis Ryukyuensis
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