The CalVet Net is also equipped with two different types of screens: 50 and 150 microns. There are 1000 microns in one millimeter. One millimeter is about the width of a strand of spaghetti. A single human hair is roughly 100 microns. 50 microns is about a half a human hair. So these screens capture anything greater than half a human hair. So many Protists and all bacteria would escape.
Today we caught many larval crabs... yes, crabs start there life cycle amongst and are a part of plankton community until they become too large and dense; When this happens, they become part of the benthic or sea floor community.
There were also pteropods (pronounced terro-pods). The Greek translation of pteropods is wing-foot They are considered zooplankton - heterotrophs! These little guys are small snails with wings and pseudo pods. These wonderful little critters are found throughout the world
Both organisms are greater than 1000 microns(1.0 mm)... so they can be readily seen with the naked eye...
Why research plankton?
One of the reasons scientists are interested in collecting zooplankton is because certain planktonic organisms are capable of building hard structures of calcium carbonate, concentrating it as shells and thus can act as indicators such as temperature change, change in the chemistry of the water, and they can tell us how they can be affected by environmental changes such as an increase in C02.