<p>Fig. 1.&nbsp;A scientist adds chemicals to a water sample from the Gulf of Mexico aboard the National Oceanic and Atmospheric (NOAA) Ship <em>Pisces</em>. The sample will be analyzed to determine levels of dissolved oxygen.</p>

Fig. 1. A scientist adds chemicals to a water sample from the Gulf of Mexico aboard the National Oceanic and Atmospheric (NOAA) Ship Pisces. The sample will be analyzed to determine levels of dissolved oxygen.

Image courtesy of National Oceanic and Atmosphere Association (NOAA) National Ocean Service