Abstract
The effect of boring sponge infestation on histology and ultra structure of mantle tissue in Perna indica was studied. Transmission Electron Microscopy (TEM) of the mantle tissue infested by boring sponges indicates that they cause irreparable damage to the cell organelles. The variations in the anatomy of the various cell organelles are discussed. Increased cellular autophagy, haemocytosis, hypertrophy of nucleus and endoplasmic reticulum, vesicle formation in nucleolus and whorl formation of mitochondria are noted in sponge infested specimens. The most consistent change was dystrophy of mantle in ultra thin sections. Sponge infested tissues also exhibited histopathological changes like degeneration of the mantle and infiltration of haemocytes.
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