Comparative histochemical study of the livers of marine fishes in relation to their behavior
2001
Akiyoshi, H. (Shimane Univ., Matsue (Japan). Faculty of Life and Environmental Science) | Inoue, A. | Hamana, A.
Background/Aims: Teleost livers are classified into two groups by histochemical properties in hepatocytes. One group contains the abundant glycogen, and the other contains the lipids in hepatocytes. The hepatic metabolism is in intimate connection of hepatic blood circulation and biliary pathway. We have studied on the correlation between behavior and histologi cal components in livers by histochemical technique. Methods: Fifty species marine teleosts were collected from the local coasts of Shimane Peninsula and Oki Island. Livers were fixed by perfusion with paraformaldehyde, and observed by light microscopy in Osmium staining for lipid and PAS staining for glycogen. Sinusoids and vascular beds in blood capillaries were identified by immunohistochemistry for a-smooth muscle actin. Results: The lipid-rich livers had 13 fishes,the glycogen-rich livers had 33 fishes and both glycogen and lipid livers had 4 fishes. Hepatopancreas had 26 fishes. The glycogen-rich livers were well developed both the sinusoidal blood system and the bile ductal system. In contrast, the lipid-rich livers were poor developed of the sinusoidal capillaries. Conclusions: The present study indicates that there were differences in the pattern of hepatic histochemical components with different moving habits. A group of streamlined and well move fish has glycogen-rich liver, and a stocky body and poor move fish that live in the bottom of the sea, has lipid-rich liver. B
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