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JPR Advance Access published online on September 10, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh095
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Received December 17, 2003
Accepted May 6, 2004

Article

The Next Generation of Optical Plankton Counter: the Laser-OPC

A. W. Herman 1*, B. Beanlands 1, and E.F. Phillips 1

1 Bedford Institute of Oceanography Dept. of Fisheries & Oceans 1 Challenger Drive Dartmouth, N. S., CANADA B2Y 4A2

* To whom correspondence should be addressed. E-mail: hermana{at}mar.dfo-mpo.gc.ca.


  Abstract

Optical Plankton Counters (OPCs) have been in operation for approximately 12 years and while there have been considerable research studies by the user community, some operational issues have emerged over this time, such as its operational limitations in high densities, the lack of accompanying flow measurements and other measurement limitations. Reported here is the next generation of this device, the Laser-Optical Plankton Counter or LOPC which was designed at the Bedford Institute of Oceanography to address the future needs of optical plankton counting. Using a narrow laser beam and new sampling geometry, the LOPC is now capable of working in plankton densities of 106 m-3 nearly 100x greater than its predecessor, the OPC, and is also capable of providing shape profiles of plankton >1.5 mm. Other new features include; i) the measurement of flow speeds through the sampling tunnel by making statistical estimates of the particle time-oftransit, ii) a lower detection limit of 100 µm, iii) high speed towing up to 8 msec-1, and iv) overall smaller physical size relative to the OPC. Data are presented from an LOPC mounted on the inside of 0.5 m plankton net (75 µm mesh size) showing linear correlation between net samples (eg. Counts of copepod eggs, nauplii) and LOPC counts. The LOPC-measured shape profiles from the same LOPC/Net tows clearly show copepods and appendages and, in some cases, euphausiids. By increasing the tunnel width relative to the original OPC, the volume sampled by the LOPC can be increased by 5x. Other towing platforms that have been tested to date are the Batfish vehicle towed at 8 kts and the Moving Vessel Profiler (MVP) towed at 12-14 kts.


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