**Do the math…**

**When the American Fisheries Society published “Fish Hatchery Management, 2nd Edition”, they made a series of companion calculators available online. Use these calculators to quickly determine length-weight relationships, unionized ammonia concentrations, and many other figures needed for day-to-day management of fish culture operations. **

**Click here or the links below to access the various calculators, and don’t forget to download our drug treatment calculator to complete your set of desktop number-crunching tools.**

#### Table 1: Length-Weight Calculator (to compute length, weight, and condition factor)

#### Table 2: Length-Weight Table (generates a table of length-weights relations for a specific species)

#### Table 3: Dissolved Oxygen Spreadsheet (F) (to compute equilibrium concentration of dissolved oxygen as a function of elevation [pressure], temperature [Fahrenheit], and salinity)

#### Table 4: Dissolved Oxygen Spreadsheet (C) (to compute equilibrium concentration of dissolved oxygen as a function of elevation [pressure], temperature [Celsius], and salinity)

#### Table 5: Gas Supersaturation Calculator (to compute the values of partial pressures for oxygen and nitrogen + argon, total gas pressure, percent saturation oxygen, percent saturation nitrogen + argon, and the nitrogen/oxygen ratio)

#### Table 6: Partial Pressure Calculator (to compute the partial pressure of oxygen in mm Hg)

#### Table 7: Ammonia Table (Freshwater) (generates a table of the mole fraction of un-ionized ammonia as a function of temperature, pH, and ionic composition)

#### Table 8: Ammonia Table (Seawater) (generates a table of the mole fraction of un-ionized ammonia as a function of temperature, pH, and ionic composition)

#### Table 9: Ammonia Calculator (Freshwater) (computes the concentration of un-ionized ammonia as a function of temperature, pH, and salinity)

#### Table 10: Ammonia Calculator (Seawater) (computes the concentration of un-ionized ammonia as a function of temperature, pH, and salinity)

#### Table 11: Oxygen Calculator (to compute the partial pressure of oxygen from concentration units)