An opaque disc, typically white, used to gauge the transparency of water by measuring the depth—known as the Secchi depth—at which the disc ceases to be visible from the surface.
- Overall difference between species in use of Secchi depths varied by habitat type.
- Mean Secchi depths tended to be higher in 1996 than in 1997, but these differences also were not statistically significant.
- Temperature (in degrees Celsius) was measured at the surface and close to the bottom, and the Secchi depth was determined.
Early 20th century: named after Angelo Secchi (1818–78), Italian astronomer.
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