Physiology of Finfish and Shellfish (2+1)

2.1.4. Effect of pressure and temperature

The amount of gas dissolved in a given volume of water depends on the pressure of the gas, twice as much gas will be dissolved. The proportionality between gas pressure and the amount dissolved is known as Herry’s law and can be expressed as follows

$$V_g = \alpha \ {P_g \over 760}.VH_2O$$

α = solubility co-efficient

V_g = Milliliter of gas dissolved in water at STPD

P_g = Pressure

VH₂O = Volume of water

Solubility of gases decreases with increasing temperature and solute concentration.

Dissolved Oxygen level mlO₂ / litre

Temperature	Freshwater	Seawater
0º	10.29	7.97
10º	8.02	6.35
15º	7.22	5.79
20º	6.59	5.31
30º	5.57	4.46