TABLE $1.$ Measurements of Water Quality Parameters

Parameter Measurement Acceptable or not acceptable

Ammonia $($NH$3)0\mathrm{.}25$ ppm $($unionized form$)$

Nitrate $($NO$3)20$ ppm

Nitrite $($NO$2)0\mathrm{.}30$ ppm

Oxygen $($ppm$)7$ ppm

pH $6\mathrm{.}5$

TABLE $2.$ Saltwater Measurements of Water Quality Parameters

Measurement Acceptable or not acceptable

Ammonia $($NH$3)0\mathrm{.}00$ ppm $($un$-$ionized form$)$

Nitrate $($NO$-3)10$ ppm

Nitrite $($NO$-2)0\mathrm{.}00$

Oxygen $3\mathrm{.}90$ ppm

pH $8\mathrm{.}5$

Salinity $30$ppt

Part $1$: Interpret each parameter in the data table and assess if it is acceptable or not acceptable for aquatic animal health, which you can mark directly in the table.

Part $2.$ Make recommendations about how to address the water quality for any parameters that do not fall within the recommended range. For this specifically point out which parameters do not fall within range and describe how it could be addressed.

Part $3$ Scenarios:

You will be presented with two scenarios relating to the minilecture on $$water quality and what happens when things go wrong$.$ You will make recommendations on what the problem is and also how to address it$.$

Scenario $1)$ Your friend just purchased a new fish tank last week. They set it up and within a few days had fish in the aquarium. Your friend is coming to you for help because slowly her fish have been dying. You ask your friend to do a water quality test and she finds that there is very high ammonia. Based on the Mini lecture $$Water Quality: When things go wrong$.$ How would you address this problem and make recommendations to your friend? What could be happening with respect to the biofilter?

Scenario $2)$ You are starting a new job at a Recirculating Aquaculture System. The business is working to establish its system but has already added steelhead trout to the system. You are worried that the biofilter has not established and notice some fish that have started to die that have brown gills. You do a water quality panel and find that ammonia is $0,$ nitrite is $1\mathrm{.}0$ ppm and nitrate is $5$ ppm$.$ What do you think is happening in the system and how can you mitigate it$?$

You will be presented with one scenario related to shellfish health and water quality. Make recommendations on what the problem is and also how to address it$.$

Scenario $3)$

In a shellfish nursery recirculating system that you are monitoring receives piped in seawater. The system has a backflow and turn off valve and can switch to two $2000-$gallon tanks of premixed seawater. The water in the system seems really cloudy and the shellfish have all closed their shells. As part of your daily system check you begin to assess ammonia, nitrate, and nitrite and salinity. You notice that the salinity reading on your refractometer is $10$ ppt and very different than yesterday$$s reading of $28$ppt$.$ What do you think is happening to the shellfish and how would you mitigate the problem?