“…For aquatic studies, Pritchard et al (1979) used a 3.5-cm-diameter glass tube containing 200 ml water, in contrast to Perez et al (1977) and Harte et al (1980), who used glass tanks containing 150 and 200 liters, respectively. Quite commonly, 20-gallon aquaria have been used with considerable success (Giddings and Eddleman, 1978;Sikka and Rice, 1973). Long fiberglass troughs, approximately 30 cm square and 6 to 12 m long (S. R. Hansen and Garton, 1982;McIntire, 1965), have been used to model streams.…”