Effect of photoperiod and temperature on development and growth of hepatopancreas of freshwater prawn Macrobrachium dayanum

Abstract

The effect of photoperiod and temperature on the development of Hepatopancreas was studied in laboratory for 30 days and divided into three different light regimes. 5 types of cells E-(embryonic) cells, F-(fibrillar) cells, B-(blister-like) cells, R-(resorptive/absorptive) cells and M-(myoepithelial/midgut) were found in Hepatopancreas of Macrobrachium dayanum. From the studies of histology and hepatosomatic index, (24L:00D) group showed an increase of the lumen of the tubules with a consequent compression of the epithelial cells, which formed a thin layer. In 24D:00L group illustrated cellular disruption, highest degree of abnormality with heamocytic infiltration and disrupted cells, disappearance of lateral cell membranes and lyses of cytoplasm in many areas. In control (12L:12D) prawns exhibited the well-organized glandular tubular shape normally seen in prawn species.