1. Or What do we use to study the marine world?
Tools of the Trade
Or What do we use to study the marine world?

2. Physical Properties Secchi Disk measures turbidity/visibility
turbidity - cloudiness due to the amount of suspended matter in the water (soil, sediments, sewage, and plankton)
Clear - low turbidity
Cloudy - high turbidity

3. Biological Properties
Dip Net
retrieves a variety of samples from the water

4. Physical Properties Hydrometer
measures density & temperature, used to find salinity
HYDROMETER

5. Physical Properties Niskin / Nansen Bottle
obtains water samples at a variety of depths
NISKIN BOTTLE

6. Biological Properties
Sediment Screen
used to screen sediments for macro invertebrates

7. Physical Properties Shipek/Peterson Grab
take a sample of the ocean bottoms

8. Physical Properties
CTD
measures conductivity, temperature & depth

9. GPS
Provide radio-navigation system giving every place on Earth an address

10. Biological Properties
Plankton Net
net towed or dipped to gather plankton samples

11. Research Vessels ALVIN Research submersible Can carry passengers
Reach depths of 14,764 ft.
Maneuverable arms, 3 portholes
ALVIN

12. Physical Properties Thermometer
measures & records temperature at a particular depth

13. Research Vessels
Trieste – first bathyscaphe to descend 35,600 ft to the bottom of the Mariana Trench