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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : The influence of total dissolved gas supersaturated water to silver carp
The influence of total dissolved gas supersaturated water to silver carp
Author : CAO Lu, LI Kefeng1
Abstract£ºThe upper Yangtze River is the center area of hydropower engineering
and also the habitat of many economic fishes, but after numbers of high-dams being
or to be put into operation, the influence of dams to fishery attracts many attentions.
During sluicing, high-speed flow with a large number of gas dissolved will generate
total dissolved gas (TDG) supersaturated water in the downstream of the dam, which
will affect the survival of fishes and even damage their lives. Silver carp is wildly
distributed in the upper Yangtze River. This paper focuses on the influence of TDG
supersaturation (TDGS) to silver carp by the acute-lethal experiment and the catalase
(CAT) activity test. In the acute-lethal experiment, Silver carp were exposed to TDG
saturation levels of 140%, 135%, 130%, 125%, 120%, 110% and 100% for 72 hours,
Silver carps in the high TDG saturation levels were all died in a short time but no
silver carp died in the low TDG saturation levels. In order to intensive study the
tolerance of silver carp to TDGS, the CAT activity test was designed to analysis the
activity of CAT in gills and muscle of Silver carp for the activity of CAT can reflect
the toxic effects by TDGS. The result demonstrated that at the beginning of exposing
to the TDG supersaturated water, CAT activity in silver carp was very low and then
changed very high, but with the exposure time went on, the activity was returned to
normal. CAT activities in gills were much higher than that in muscle. The research on
the influence of TDGS to fishes can quantitatively evaluated the suitable living
conditions of silver carp and provided basic date for developing the standard of
environment evolution.
File Size : 428,473 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 28/08/2015
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