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Haney Grazing Chambers

• General purpose water and quantitative
• In-situ zooplankton community grazing rates
• Filtration rates of individual plankton
• Highly sensitive
• Simple measurements
• Naturalness of conditions

The Haney Grazing Chamber (Haney;1971) was developed to gently trap zooplankton while automatically exposing the enclosed assemblage to trace amounts of radio-labelled food particles. Isolated in-situ, the animals are allowed to feed on the suspension for a short period. Upon retrieval, the sample is filtered and zooplankton are assayed for ingested particles.

High sensitivity, simple measurements and naturalness of conditions are offered by this well known experimental technique. A characteristic design feature of the grazing chamber are rotational polycarbonate lids within a clear polycarbonate tube, similar to a "butterfly-valve", where integral silicone "O" rings seal against the cylinder wall in horizontal and watertight position.

Pivotal lids, articulated by a Delrin® linkage, are held in the "open" position by a messenger release mechanism during deployment. As a messenger strikes the release mechanism, gravity pulls the weighted (by stainless steel tube) cylinder downward while the lids rotate to the horizontal (closed) position.

Immediately, as the lids of the chamber close, the piston is forcefully ejected to release labeled particles into the chamber. Using the key innovative design features of the original sampler, the ARI/Haney Grazing Chamber is a simplified version of the original design constructed using advanced plastics.

The improved Grazing Chamber, also offered as economical ARI/Haney Water Sampler, has enhanced technical capabilities over the original sampler including:

• Fewer moving parts than the original design and similar type water samplers
• Ultra-high impact and chemical resistance
• Watertight seals
• Sure-fire, messenger activated, gravity closing mechanism; (no internal closures)
• Free-falling/self-closing deployments to 40 m deep
• Safe, ergonomic sampler arming
• Safer injection/piston assembly

ARI/Haney Water Sampler

• water sampler; clear polycarbonate cylinder (15 cm O.D. x 30 cm height; 3.0 liter capacity)
• polycarbonate rotating lids with integral rubber "O" rings
• messenger release mechanism; polycarbonate and Delrin® construction; 333 gm bronze messenger
• plastic carrying case

ARI/Haney-Grazing Chamber

• grazing chamber; clear polycarbonate cylinder (15 cm O.D. x 30 cm height; 3.0 liter capacity)
• rotating polycarbonate lids with integral rubber "O" rings
• messenger release mechanism
• polycarbonate and Delrin® construction; 333 gm bronze messenger
• piston assembly
• polycarbonate and stainless steel construction
• 5.0 ml capacity, polycarbonate Luer-lockÅ fittings, syringes
• plastic carrying case
• wastewater carboy and ring net (specify mesh size)
• call or write for quote

Citations

Haney, J.F., 1971. An in-situ method for the measurements of zooplankton grazing rates. Limnology and Oceanography, 16(6): 970-977. Gliwicz, Z.M. 1968. The use of anaesthetizing agent substance in studies on the food habits of zooplankton communities. Ekol. Pol. 16(13): 279-295

2.0l Haney Grazing Chambers

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