Club goals• Take care of horseshoe crabs – Tank chemistry information for state of Maryland – Observe and experiment – What do you want to know about them?• Tell others about our experiments – Website – Photos
Tank Chemistry—what we measure• Salinity (20-30 ppt)• pH (7.8-8.2)• Ammonia (0 ppm)• Nitrites (0 ppm)• Nitrates (< 80 ppm)• Temperature (68-74˚F)
Hydrometers measure salinityRead the This whiteleft side of wedge willthe scale. move up the scale and point at a number.
pH Too much acid or base will kill the horseshoe crabs• Looking for “Just Right” 7.8-8.2
Nitrogen Cycle Hi I am yourhorseshoe crab
How to measure Several of the tests require 15 milliliters of water. This needs to be measured exactly. Here are some tips: • Hold the test tube at eye level. • The top of the water will be curved. This is called the meniscus. • The bottom of the curve should be on the line.
Once you add the chemicals, compare the results to the chart Find the closest color and record the number under it.