I. INTRODUCTION
NTENSIVE fish farming by its nature grows many fish in a
confined area which produces considerable amounts of
nutrient waste in dissolved form – i.e. ammonia and urea –
and in particulate form – i.e. uneaten food and faces [1]. These
wastes are usually discharged to the surrounding environment
which acts as an effective agent of dilution and dispersion.
However, each form of waste can have an impact on the
environment, in the form of nutrient enrichment effects or
direct and indirect toxicity effects at a lethal and sublethal
level, which may alter the nature or ecology of the local
system [2]. The reared fish also has demand for the oxygen
and can lead to low oxygen content in the rearing location [3].
In good water conditions, high content of nutrients, especially
phosphorus and nitrogen compounds, will stimulate primary
production and can lead to phytoplankton blooming especially
during the summer, when the temperature rises [4]. The
degradation of excessive phytoplankton biomass can lead to
further oxygen content reduction and nutrients content
increase in water. These environmental impacts must be
maintained at a minimum and within acceptable limits. The
basics tool is data generation process from which decisions on
the environmental management may be reached, i.e.
monitoring. Monitoring may look at many topics and levels
including the scale of impacts, general ecological change, and