Abstract:
There are 4 classes in phylum Cnidaria, which are the Anthozoa, Scyphozoa, Cubozoa
and Hydrozoa. In this study, two classes of phylum Cnidaria were found in Kuala
Terengganu waters, which are Scyphozoa; order Semaeostomeae and Cubozoa; order
Cubomedusae. Both orders differ from their dietary to their feeding behaviors. Food
item frequency method and gravimetric method were used to find the dietary of these
two orders. The dietary of these two orders were studied and the dietary of
Semaeostomeae was mainly plankton, while the dietary of Cubomedusae was mostly
fish with food item frequency composition value of 81.25%, gravimetric composition
value of 83.70%, numerical composition value of 81.25% and index of relative
importance value of 13402.30. The relationship between the weight of the Cnidarians
and their bell diameter was also studied. For Semaeostomeae, there was no
relationship while for Cubomedusae, there is a significant relationship.
