The Larvaceans

August 13

There’re no vistas to look upon tens of meters below the surface. Light has a hard time down there. The Digital Autonomous Video Plankton Recorder (DAVPR) camera images a field of view 17x13mm. What results is a storm of plankton streaming past the camera: copepods (Calanus glacialis and Pseudocalanus spp. most common), larvaceans and their houses, marine snow particles, chaetognaths, diatoms, barnacle nauplii, jellyfish and ctenophores, and crab zoea.

Focus varies, but with our lack of proper Internet goods, I’ve not heard him complain. Phil’s laptop spools through the 50,000 some frames of a half-hour cast. It identifies suspects dramatically, much in the same way facial recognition software appears to work on a TV show taking license, pulling up candidate snapshots like digital polaroids and saving these for later analysis.

Okay, they are not cat videos, but the larvaceans are quite wonderful in situ. They and their inflated houses, red guts and serpentine tails make for quite a show amidst the other surprised plankton. Not to mention, they have a terrible fondness for clogging the Mocness nets like scraps of wild rumor. No pointing fingers when someone’s got a saltwater hose aimed for payback. I can only confirm the gunk in the nets is real.

 

You can also follow the R/V Sikuliaq @rmtopp@Sikuliaqon Twitter and @toppworldon Instagram and @R/V Sikuliaq on Instagram and Facebook. To further chart the course of this August 2018 expedition, look up Arctic Winds, Fish, Fins, and Featherson Facebook.

—Thanks to the R/V Sikuliaq, Woods Hole Oceanographic Institute, and the University of Alaska Fairbanks College of Fisheries and Ocean Sciences, and the National Science Foundation.

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