. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 74 K. A. RASKOFF ET AL. Inlet Figure 2. Contemporary planktonkreisel design showing separated inlet/outlet chamber and tank access lid. Detailed plans of this tank are available online at Water flows from the inlet chamber and jets in a laminar flow across the lower side of a fine-mesh screen, which separates the main tank from the drain outflow. In this way any specimen that drifts near the outflow screen will be pushed away by the incoming water. The placement of a few parallel layers
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 74 K. A. RASKOFF ET AL. Inlet Figure 2. Contemporary planktonkreisel design showing separated inlet/outlet chamber and tank access lid. Detailed plans of this tank are available online at Water flows from the inlet chamber and jets in a laminar flow across the lower side of a fine-mesh screen, which separates the main tank from the drain outflow. In this way any specimen that drifts near the outflow screen will be pushed away by the incoming water. The placement of a few parallel layers of polycarbonate double-wall sheet, commonly used as greenhouse siding, into the space be- tween the inlet chamber and the main tank will force the inlet water to enter with a smooth laminar flow. Modifica- tions to the planktonkreisels made by the Monterey Bay Aquarium include the construction of a separate outflow and lid, which allows animals to be put into or removed from the kreisel without danger of being sucked down the drain. A larger lid allows for easier access into the tank for cleaning and manipulation of the specimens (Sommer. 1993). For scientific purposes, a matte black back plate allows for side lighting of transparent plankton, achieving dark-field illu- mination (Hamner, 1990). For display aquaria, a matte translucent blue-and-white acrylic back, illuminated from behind with fluorescent lamps, can be used to create the appearance of a lifelike blue-water environment. Spotlights from the sides of the tank are used to illuminate animals for display or photographic purposes. Strong lights do not ap- pear to bother many gelatinous species, which typically have limited visual equipment. Most gelatinous organisms can do well in planktonkreisels (see Tables 1 and 2 for a summary). Plans of a planktonkreisel developed by Kim Reisenbichler at the Monterey Bay Aquarium Research Institute (Fig. 2) are available for download at Anot
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