A method of enhancing aquatic organism growth is provided. The method comprises
the step of introducing an alkane into water containing the organism. The alkane
can be introduced intermittently, either alone or with another gas such as oxygen.
Nutrients can be introduced with the alkane or separately. The alkane can comprise
a butane substrate and can include at least one of n-butane and iso-butane. The
organism can be selected from the group of: fish, crustaceans, mollusks, algae
and aquatic plants. Organisms grown by the method and systems for practicing the
method are also included.