Hepatic Morphology and Acid Phosphatase Localization in the Channel Catfish (Ictalurus punctatus)

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Abstract
Livers of 50 channel catfish (25–15 cm long) obtained by seining from the Ross Barnett Reservoir near Jackson, Mississippi were subjected to light, electron microscopic, and enzyme histochemical examination to describe the hepatic parenchyma and exocrine pancreas as well as localize acid phosphatase. Similar to that of other fish species, catfish liver parenchyma consisted of laminae of dual-plated muralium and, unlike that of many species, dispersed exocrine pancreatic tissue was observed circumscribing the portal vein, its tributaries, hepatic artery, and its branches. Acid phosphatase activity was histochemically localized to reaction product in lysosomal-like bodies arranged in peribiliary canalicular patterns. Electron microscopic observations were consistent with the above observations and biliary canaliculi were noted with long microvillar processes occupying their lumens. The exocrine pancreatic cells contained granular endoplasmic reticulum, free ribosomes, Golgi bodies, and numerous membrane-bound zymogen granules.

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