Currently, many researchers’ studies on behavioral
decision-making of artificial fish are constrained by
information from the external environment. In other words, the
design of fear is quite simple. What they designed was that
when discovering danger the artificial fish would escape at
once. The deficiency of this design is that it does not consider
the degree of fear produced by different levels of danger or
other emotional factors. In order to enrich artificial fish’s
emotions and to simulate their intelligent behavior in the
complicated ocean environment, this paper classifies the
degrees of fear, happiness and sadness, which are determined
by artificial fish’s perception of the external environment. This
paper establishes the fear degrees by the distance of identified
enemies, the happiness degrees by how much the fish like the
food around them and the sadness degrees by how hungry the
fish are inside themselves