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| Histological Features of Hematopoietic Organs of Normal and White-gill Diseased Large Yellow Croaker Pseudosciaena crocea |
| CUI Long-bo,CHI Shuang,LI Xin-hua,LIU Ran,LI Qian,ZHAO Zhen-jun,MA Jia-hao |
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Abstract The histological structure of hematopoietic organs was studied in normal large yellow croaker Pseudosciaena crocea and the pathological changes was histologically observed in the white‐gill diseased large yellow croaker to understand the pathogenesis of the w hite‐gill disease . T he obvious trabeculae divided the splenic parenchyma being comprised of w hite pulps , red pulps , sheathed capillaries and melanomacrophage center into numerous irregular lobules .The white pulps were formed by the tightly packed small lymphocytes ,and the sheathed capillary around the red pulp was located in each lobule . There were many melanomacrophage centers in the spleen .The lymphoid tissue in the head kidney was divided into lymphocyte‐aggregate region which consisted of the tightly packed small lymphocytes and granulocyte‐aggregate region which was mainly composed of the granulocytes and the neutrophils .The interrenal tissue cells were found in the head kidney .In the fishes with white‐gill disease ,the gills and the livers were pale in color and the bile was large in size . The splenic trabeculae and the lobules were indistinct ,and the red pulps were filled with a lot of erythrocytes showing serious degenerative changes and there were rare small lymphocytes . Numerous macrophages contained the swallowed masses with different colors .The small lymphocytes in the lymphocyte‐aggregate regions and the granulocytes and the neutrophils in the granulocyte‐aggregate regions were decreased obviously ,while the monocytes in the granulocyte‐aggregate regions were increased significantly in the head kidney and kidney .The bile pigment granules were found in the renal tubules .There were few haemocytes ,in particular ,erythrocytes ,in the blood vessels of liver ,gill and other organs .
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Received: 25 June 2014
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