Schlieren Technique for Studying Water Flow in Marine Animals

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Science  24 Sep 1965:
Vol. 149, Issue 3691, pp. 1515-1516
DOI: 10.1126/science.149.3691.1515-a


A Schlieren optical technique has been developed for studying the flow of water through certain mollusks and brachiopods in sea-water environments. Optical contrast is accomplished by changing either the temperature or salinity of the water. A temperature difference of 0.1°C or a change in salinity of 0.5 per thousand over a path I mm long is visible. The technique may be applied in situ in the ocean or through windows in aquaria.