Abstract:
During the gonadal maturity process, changes are occured in the morphological and anatomical characters of fish ovary. This
study aims to understand the morphoanatomical changes as the ovary of Ompok hypopthalmus develop. The fish were
captured from the Kampar River. Fish that were in 2nd, 3rd and 4th maturity levels were studied directly. Morphological and
anatomical characteristics of the liver, gonad and viscera were then described. Results shown that the GSI increase as the
gonad developed, from 1.5529 in the 3rd maturity stage into 7.0616 in the 4th maturity stage. The VSI and HSI, however, are
fluctuated, it peaked in the 3rd maturity stage (4.3479 and 1.2558 respectively) and decrease in the 4th maturity stage (2.8352
and 1.0648 respectively), indicating that the energy stored has been allocated for gamet development. Moreover the color of
the liver in the 2nd and 3rd maturity stage fishes were relatively pale than that of the 4rd maturity stage fishes, indicated that
part of the stored fat in the liver has been allocated for gonad development.
