RESULTS
Anatomically, the thymus gland of A. panchax is
bilaterally placed and apparently triangular in shape,
observed under optical light microscope (LM).
Microanatomically, this gland is located at the uppermost
part of the mid dorso-lateral region on the either side of
opercular cavity at the base of third and fourth gill arches
(Fig. 2) which is also very close to the head kidney (Fig.
3). The thymus gland is hardly characterized into cortex
and medulla. A large number of lymphoid cells are
frequently noted within the thymic stroma of A. panchax
(Fig. 4).