Standard Practice for
Sampling Phytoplankton with a Clarke-Bumpus Plankton
Sampler1

This standard is issued under the fixed designation D 4134; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This practice covers the procedures for obtaining semiquantitative samples of a phytoplankton community by use of
a Clarke-Bumpus plankton sampler.

1.2 This standard does not purport to address all of the
safety problems, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Document

2.1 ASTM Standards: 2
D 4137 Practice for Preserving Phytoplankton Samples

3. Summary of Practice

3.1 The sampler is towed from a moving boat at a specified
depth. The sampler uses a net for the concentration of
organisms and, as such, may be considered to be a semiquantitative sampler. It is quantitative in that the actual volume of
water entering the sampler is measured by a calibrated flow
meter. The phytoplankton are preserved as dictated by the
objectives of the study.

4. Significance and Use

4.1 The advantages of the Clarke-Bumpus plankton sampler
are as follows:

4.1.1 It will sample a discrete depth or multiple depths,
depending upon the sampling design.

4.1.2 It is a slow to medium speed sampler requiring a
towing speed of 3 to 5 knots.

4.1.3 The sample size can be easily controlled.

4.1.4 The sampler is light-weight and can be used without
auxiliary equipment

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