Estimation of the population size and mortality rate of ayu, Plecoglossus altivelis altivelis in the Nahari River by underwater line transect method.

Turbid water induces refuge behaviour of a commercially important ayu: A field experiment for interstream movement using multiple artificial streams

“…The present results showed that ayu density decreased by flowing turbid water including suspended solid concentration of approximately 200 mg/L. However, Takahashi and Kishino (2017) reported that ayu density decreased under a lesser concentration, 20-50 mg/L. These impacts of slightly turbid water on ayu density can be observed only when the turbid water flowed from days to months (Takahashi & Kishino, 2017).…”

“…However, Takahashi and Kishino (2017) reported that ayu density decreased under a lesser concentration, 20-50 mg/L. However, Takahashi and Kishino (2017) reported that ayu density decreased under a lesser concentration, 20-50 mg/L.…”

“…However, Takahashi and Kishino (2017) reported that ayu density decreased under a lesser concentration, 20-50 mg/L. These impacts of slightly turbid water on ayu density can be observed only when the turbid water flowed from days to months (Takahashi & Kishino, 2017). Along with experiences of chronic stresses by turbid water (Awata et al, 2011), indirect effects through degradation of food resources (i.e.…”

Draft Genome Sequences of Six Flavobacterium psychrophilum Strains Isolated from Dead Juvenile Ayu (Plecoglossus altivelisaltivelis) near the Mouth of the Nahari River, Kochi, Japan

“…Ayu (Plecoglossus altivelis altivelis) is a popular angling fish in Japan. During 2006 to 2012, the ayu population in the Nahari River, located in the eastern Kochi Prefecture on Shikoku Island, was estimated to be 145,000 to 1,540,000 individuals, and a decrease of 30% to 76% was observed in the population between May and October of each year (1). One of the possible causes for this decrease in the ayu population is the occurrence of bacterial cold-water disease (BCWD) (1).…”

“…During 2006 to 2012, the ayu population in the Nahari River, located in the eastern Kochi Prefecture on Shikoku Island, was estimated to be 145,000 to 1,540,000 individuals, and a decrease of 30% to 76% was observed in the population between May and October of each year (1). One of the possible causes for this decrease in the ayu population is the occurrence of bacterial cold-water disease (BCWD) (1). Flavobacterium psychrophilum, belonging to the family Flavobacteriaceae, (2) order Flavobacteriales (3), and class Flavobacteriia (4), is the etiological agent of BCWD.…”