A case study of reactions of ayu (&lt;i&gt;Plecoglossus altivelis&lt;/i&gt;) to low concentration of suspended solids in river channels: a field experiment at a river reach scale.

Kato, Yasumitsu; Onoda, Yukio; Mori, Takemi; Kayaba, Yuichi

doi:10.3825/ece.18.155

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…In contrast, using large experimental streams, ayu did not move from turbid to clear water in our previous studies, when the maximum concentration of suspended solid reached approximately 27 mg/L (Kato et al, 2015). Like Kato et al (2015), we examined avoidance behaviour in experimental streams and not in water tanks; experimental streams may have more longitudinal, lateral and vertical heterogeneity in water quality than water tanks. We measured the concentration in the centre of flow, which may be higher than that along the curves and banks.…”

Section: Discussionmentioning

confidence: 91%

“…Laboratory experiments using water tanks showed that ayu avoided turbid water, that is with a suspended solid concentration of more than 15 mg/L (Honda, 1983), but in our previous field experiments using artificial streams, ayu did not react to turbid water with a suspended solid concentration of approximately 27 mg/L (Kato, Onoda, Mori, & Kayaba, 2015). Then, we added silt to the experimental streams and controlled their concentration, which reached 400 mg/L.…”

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confidence: 99%

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

Mori

Kato

Takagi

et al. 2018

Ecology of Freshwater Fish

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Riverine systems are inherently dendritic in nature, and turbid water may not necessarily flow equally throughout an entire catchment. Tributaries have the potential to serve as refugia from temporarily turbid water in the main stem. As ayu (Plecoglossus altivelis) are one of the important species for the inland fisheries industry and recreational fishing, their behaviour in a branched river network is a primary concern. We released ayu with radio‐transmitting tags into two experimental streams that joined at a downstream pool. Turbid water was released into one of the streams, and we identified whether avoidance movement of ayu between the two experimental streams was triggered by flowing turbid water. The suspended solid concentration elevated rapidly after adding the turbid water and was maintained at more than 400 mg/L for 3 hr. Avoidance movement of ayu was triggered when the suspended solid concentration exceeded approximately 200 mg/L. Then, most ayu moved from the turbid stream to the nonturbid one, leading to a difference in ayu density between the two streams. Therefore, we demonstrated that turbid water induced interstream movement of a commercially important ayu as refuge behaviour, suggesting that river connectivity is important for the persistence of the ayu.

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Section: Discussionmentioning

confidence: 91%

mentioning

confidence: 99%

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

Mori

Kato

Takagi

et al. 2018

Ecology of Freshwater Fish

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“…Abrasion of the gill epithelium by sediment particles may increase the chance of infection and susceptibility to disease (Herbert & Merkens, 1961). Salmonids evade turbid water (Bisson & Bilby, 1982;Sigler et al, 1984;Yamashita & Suzuki, 2019), whereas adults of ayu Plecoglossus altivelis may or may not evade turbid waters (Kato, Onoda, Mori, & Kayaba, 2015;Tanaka, Suzuki, Hoshino, & Matsuoka, 2014), yet such behavioural differences have not been fully examined.…”

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Effects of increasing concentrations of fine suspended sediment on the survival, growth, condition factor and gill condition of artificially reared juveniles of Oncorhynchus masou , Salvelinus leucomaenis and Plecoglossus altivelis

Matsuda

2019

Aquac Res

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Little is known about the effect of chronic turbidity created by fine suspended sediment on the health and growth of artificially reared Oncorhynchus masou, Salvelinus leucomaenis and Plecoglossus altivelis—three important aquaculture species in Japan. This study compared survival rate, daily growth rate, condition factor (estimated from the ratio of standard length to weight) and gill condition among like‐sized juveniles exposed to fine suspended sediment (<2‐µm fraction) at concentrations of 0, 50, 100 and 500 mg/L, after 21 days. Even at 500 mg/L, there was almost no damage to the gill condition in all species. In O. masou, the daily growth rate was unexpectedly high in the 500‐mg/L treatment group, and condition factor was higher at sediment concentrations of 100 and 500 mg/L than at 0 mg/L. In S. leucomaenis, daily growth rate was significantly lower in the 500‐mg/L treatment group as compared with all other groups, but condition factor did not significantly differ among the treatments. The survival rates of O. masou and S. leucomaenis did not significantly differ among the treatment groups. In P. altivelis, neither survival rate, daily growth rate nor condition factor significantly differed among the treatments. The concentration of fine suspended sediment that affects the growth and condition factor of each of these species is likely related to their natural habitat.

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A case study of reactions of ayu (<i>Plecoglossus altivelis</i>) to low concentration of suspended solids in river channels: a field experiment at a river reach scale.

Cited by 2 publications

References 21 publications

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

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

Effects of increasing concentrations of fine suspended sediment on the survival, growth, condition factor and gill condition of artificially reared juveniles of Oncorhynchus masou , Salvelinus leucomaenis and Plecoglossus altivelis

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