-What are the products and reactants of chemosynthesis

Question

-What substance cam be measured in the water to estimate the amount of primary production?

Answer 1

The answer to your first question can be found at
http://www.answers.com/topic/chemosynthesis

With regard to your second condition, I assume you mean primary production of carbohydrates by photosynthesis. The rate of production of biomass can be used. It is associated with the presence of algae. See
http://en.wikipedia.org/wiki/Primary_production#Oceanic_production