Diel patterns of larval drift of honmoroko Gnathopogon caerulescens in an inlet of Ibanaiko Lagoon, Lake Biwa, Japan

2014 ◽  
Vol 86 (1) ◽  
pp. 409-415 ◽  
Author(s):  
T. Kikko ◽  
D. Ishizaki ◽  
K. Ninomiya ◽  
Y. Kai ◽  
Y. Fujioka
Keyword(s):  
Lake Biwa ◽  
Larval Drift ◽  
Diel Patterns ◽  
Gnathopogon Caerulescens ◽  
Lagoon Lake

Juvenile migration of the exclusively pelagic cyprinid, Gnathopogon caerulescens (Honmoroko) in Lake Biwa, Central Japan

2018 ◽  
Vol 92 (5) ◽  
pp. 1590-1603 ◽  
Author(s):  
T. Kikko ◽  
D. Ishizaki ◽  
K. Kuwamura ◽  
H. Okamoto ◽  
M. Ujiie ◽  
...  
Keyword(s):  
Lake Biwa ◽  
Central Japan ◽  
Gnathopogon Caerulescens

scholarly journals Estimate of number of Honmoroko Gnathopogon caerulescens caught by recreational anglers around Ibanaiko Lagoon, adjacent to Lake Biwa

2015 ◽  
Vol 81 (1) ◽  
pp. 17-26 ◽  
Author(s):  
TAKESHI KIKKO ◽  
TOSHIHIDE KITAKADO ◽  
DAISUKE ISHIZAKI ◽  
MUNEJI UJIIE ◽  
NORIO SAWADA ◽  
...  
Keyword(s):  
Lake Biwa ◽  
Gnathopogon Caerulescens

Spawning habitat selectivity of Honmoroko, Gnathopogon caerulescens, in lagoon inlets, Lake Biwa, central Japan

2019 ◽  
Vol 67 (1) ◽  
pp. 185-190 ◽  
Author(s):  
Takeshi Kikko ◽  
Daisuke Ishizaki ◽  
Yoshitaka Kataoka ◽  
Nobuyuki Oue ◽  
Akihisa Sakai ◽  
...  
Keyword(s):  
Lake Biwa ◽  
Spawning Habitat ◽  
Central Japan ◽  
Gnathopogon Caerulescens

Contribution of large bacteria to bacterial biomass in a deep freshwater lake (Lake Biwa, Japan)

2020 ◽  
Vol 85 ◽  
pp. 131-139
Author(s):  
S Shen ◽  
Y Shimizu
Keyword(s):  
Cell Volume ◽  
Bacterial Cell ◽  
Lake Biwa ◽  
Bacterial Biomass ◽  
Spatial Variations ◽  
Freshwater Lake ◽  
Heterotrophic Nanoflagellates ◽  
Bacterial Productivity ◽  
Transmission Electron ◽  
Seasonal And Spatial Variations

Despite the importance of bacterial cell volume in microbial ecology in aquatic environments, literature regarding the effects of seasonal and spatial variations on bacterial cell volume remains scarce. We used transmission electron microscopy to examine seasonal and spatial variations in bacterial cell size for 18 mo in 2 layers (epilimnion 0.5 m and hypolimnion 60 m) of Lake Biwa, Japan, a large and deep freshwater lake. During the stratified period, we found that the bacterial cell volume in the hypolimnion ranged from 0.017 to 0.12 µm3 (median), whereas that in the epilimnion was less variable (0.016 to 0.033 µm3, median) and much lower than that in the hypolimnion. Additionally, in the hypolimnion, cell volume during the stratified period was greater than that during the mixing period (up to 5.7-fold). These differences in cell volume resulted in comparable bacterial biomass in the hypolimnion and epilimnion, despite the fact that there was lower bacterial abundance in the hypolimnion than in the epilimnion. We also found that the biomass of larger bacteria, which are not likely to be grazed by heterotrophic nanoflagellates, increased in the hypolimnion during the stratified period. Our data suggest that estimation of carbon flux (e.g. bacterial productivity) needs to be interpreted cautiously when cell volume is used as a constant parametric value. In deep freshwater lakes, a difference in cell volume with seasonal and spatial variation may largely affect estimations.

Some Experimental Discussion of Accuracies in Quantitative Virus Assessment for Water Supply

1985 ◽  
Vol 17 (10) ◽  
pp. 127-138
Author(s):  
Hisashi Sumitomo
Keyword(s):  
Public Health ◽  
Water Supply ◽  
Organic Compounds ◽  
Lake Biwa ◽  
Tap Water ◽  
Statistical Procedure ◽  
Statistical Nature ◽  
The Public ◽  
Public Risk ◽  
Precise Assessment

Chlorination has been believed to be the best sterilization method in water supply engineering for many years. However, the recent carcinogenic problem of trihalomethanes (THM) formed from organic compounds by chlorination requires us to assess the public health risk of THM. The author tried an assessment of a suitable chlorination technique considering both the effects of THM and viruses on human health, using Lake Biwa as a representative example of a water resource in Japan. Statistical handling of data was revealed to be important because of the statistical nature of the data. In other words, since both concentrations are very low in tap water, we need to quantify both the effects and concentrations with probabilities. In the first part of this paper, a statistical procedure and numerical results of the assessment of virus and THM risks are shown. In the second part some results of accuracies in virus experiments are briefly shown. These experiments concerning statistical problems are particularly important for more precise assessment of the public risk of viruses in tap water.

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