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secchi disk with rope on a white table.
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JPG 300 DPI
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Author:
dreamstime
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buy for Personal Use & Commercial
File Type:
JPG
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aquaculture
aquarium
aquatic
biology
black
bloom
bucket
chain
charophyte
closteriaceae
container
deep
depth
desmidiacea
differential
disc
disk
environment
environmental
equipment
freshwater
housework
icon
lake
limnology
line
measure
measurement
metering
microscope
nature
pail
peat
retro
rope
science
scientific
sea
secchi
set
surface
transparency
turbidity
visibility
water
web
white
zoology
zooplankton