What is in seawater?
The main units of seawater are sodium (85%), chlorine (some %) and trace amounts of sulfur dioxide. Some of the solids dissolved in seawater are produced by the weathering of rocks and land
Salinity:
This is defined by the amount of dissolved salt in the water
1) Expressed in units of PPT (parts per thousand) or PSU (practical salinity units)
2) The average ocean salinity is appx. 35 ppt
3) Salinity varies due to evaporation and precipitation
4) A rapid change in salinity is known as the Halocline
Anadromous Fish:
These fish spend their adult lives in salt water and return to fresh water to spawn. A perfect example is a salmon
Catadromous Fish:
These fish are the opposite. They live in fresh water and spawn in salt water. The eel would fit this description
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