Collecting sample following three-hour tow of High-speed micronekton net used to collect organisms in surface waters. The net is made of an open weave, nylon, woven mesh. on-board Coast and Geodetic Survey Ship EXPLORER cruise from Seattle to Norfolk, the first international expedition of the USC&GS.

High-speed micronekton net used to collect organisms in surface waters. The net is made of an open weave, nylon, woven mesh. on-board Coast and Geodetic Survey Ship EXPLORER cruise from Seattle to Norfolk, the first international expedition of the USC&GS.

High-speed micronekton net used to collect organisms in surface waters. The net is made of an open weave, nylon, woven mesh. on-board Coast and Geodetic Survey Ship EXPLORER cruise from Seattle to Norfolk, the first international expedition of the USC&GS.

Plankton net being deployed on C&GS Ship PIONEER - probably during 1964 Indian Ocean Expedition.

Recovering plankton sample

Plankton net recovery on board USC&GS OCEANOGRAPHER during its 1967 global expedition.

Plankton samplers on display.

General view of marine biological laboratory at the University of Delhi.

Hypophysectomy being performed on fish at the University of Delhi in a NOAA supported international project.

The separation of hundreds of thousands of fish larvae from the plankton samples taken on nine THEODORE N. GILL cruises required many hours of tedious and careful microscope work.

The sorting of fish larvae to major groups and sizes and the identification of the hundreds of species of fish occurring the study area is a monumental task requiring careful microscopic examination of larvae and constitutes a major effort of the South Atlantic Biological Investigations personnel.

Plankton unusually rich in mixed fish species.

Constituents of a plankton sample.

The Gulf V plankton sampler. This high-speed sampler has been successfully employed in the larval shrimp study of the Galveston Biological Laboratory.

Fish eggs and invertebrates in plankton sample from the California current.

A modern plankton net used in collecting fish eggs and larvae.

Two one-meter nets of different mesh size are hauled side by side in order to determine the extent of loss of smaller organisms through the mesh openings of the standard plankton net used on CalCOFI cruises.

Sampling for plankton from the shore

Open house participants amazed by display of live plankton.

Examining a culture of marine phytoplankton grown in radioactive seawater under controlled conditions of light and temperature.

Plankton nets for sampling post-larval shrimp at different levels.

Apparatus used in collecting samples of bottom organisms including Van Veen grab sampler, Digby scoop, Digby scallop drag, and sled net.

Contract shrimp trawler MISS ANGELA with Gulf V plankton sampler being lifted aboard.

The Beyer sled, used to sample plankton occurring near the sea bottom.

The three-celled counting chamber was designed to fulfill a specific need in the study of variations in the distribution of very small zooplankters. This need was to be able to describe the mechanisms underlying the distribution and movements of sardines, it was necessary to precisely determine the distribution of their food which consist primarily of small zooplankters.

Retrieving a serial plankton sampler aboard the NOAA Research vessel DAVID STARR JORDAN. Samples taken measure the vertical distribution of plankton .

Plankton sampling on the ALBATROSS IV. Snow flakes flying giving indication of miserable working conditions. Note classic Sou'wester on left-most crewman.

Plankton sampler aboard R/V SISCOWET.

Plankton winch on the BCF ship HUGH M. SMITH.

A gas flow geiger counter used to determine the carbon 14 incorporated in phytoplankton during measurements of their rate of photosynthesis in the BCF Radiological Laboratory at Beaufort, N.C.

Deploying a discrete plankton sampler from the BCF Ship GERONIMO . Up to five used. Conrad Mahnken is deploying the net.

Deployed plankton dragnet.

1-meter plankton net aboard the ALBATROSS IV

High-speed plankton samplers are used aboard the USBCF vessel MURRE II to determine changes in distribution and abundance of zooplankton. These small animals are important sources of food for young salmon once they enter salt water. The distribution and abundance of plankton is partially controlled by water temperature, salinity, and ocean currents.

Marine biologists setting a plankton net.

Reading sea water surface temperature from bucket.

Preserving plankton samples collected with G-V plankton net mounted on runners to permit sampling within 4 feet of the ocean bottom.

Plankton samples collected on the ALBATROSS IV

The Gulf V plankton sampler

The Miller high-speed plankton sampler

Filtering plankton from a Nansen bottle sample in the chemistry laboratory of ALBATROSS IV

Examination of zooplankton samples for indicators of water masses at the USBCF Booth Bay Harbor laboratory.

Washing Gulf V plankton sampler. These nets are used to collect microscopic plant and animal life which are primary foods of many larger fish and shellfish.

Removing sample cup from Gulf V plankton sampler.

Collecting plankton samples at sea aboard a chartered shrimp trawler to determine the distribution and abundance of the larval and early postlarval stages of commercial shrimp.

The diatom Gyrosigma acuminatum collected from Lake Huron in 1956. Diatoms are major constituents of Great Lakes plankton and also are important in the diets of larval sea lampreys.

Phytoplankton dominated by Ahlosphaera with Ceratium longipes from a surface haul.

Plankton dominated by the Ctenophore Pleurobrachia pileus with a barnacle (Balanus) larvae in the 'nauplius" stage. Figure 19. An unusually rich catch of haddock eggs with glassworm Sagitta elegans, the pteropod Limacina retroversa, Calanus, and other copepods.

Mid-winter phytoplankton in the inner part of the bay -- dominated by the diatom genus Coscinodiscus with Chaetoceras, the peridinian Ceratium longipes, and microcopepods. Magnified X 40.

Zooplankton from southern slope of Georges Bank. Plankton dominated by juvenile amphipods (Euthemisto). Magnified X 9.