Alabaster and Lloyd (1980) identified the pH range that is not directly lethal to freshwater fish as. 5.0-9.0. With few exceptions, pH values between 6.5 and 9.0 are satisfactory, on a long-term. basis, for fish and other freshwater aquatic life.
Papaya seeds can prevent and cure ailments related to the liver, gut, kidneys, bacterial and fungal infections, and dengue. They also help in contraception. Papaya seeds contain nutrients that help heal cirrhosis of the liver and improve kidney health, preventing renal failure.
The black seeds are edible but bitter peppery flavor. Most parts of papaya has enzyme that assists in digesting proteins. It is called papain, concentrated specifically in unripe fruit. It is commercially extracted for making digestive enzyme dietary supplement proven to have benefits in digestion. Papain is a whitish juice, an enzyme that breaks up protein.