Structural Organization and Photoresponsive Elements of the Pineal Complex in Indian Major Carp Catla catla

The present investigation dealt with structural organization and light-responsive elements of the pineal complex in a hitherto unstudied surface dwelling Indian major carp, Catla catla. Morpho-anatomical study indicates that the pineal complex in this commercially important fish comprises of a distally located antero-laterally elongated dorsoventrally flattened 'end vesicle', which is connected to the third ventricle by a long thin 'pineal stalk'.