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Effects of Starvation on the Morphometric Characteristics and Histological Changes in Chum Salmon (Oncorhynchus keta) Fry
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  • Journal title : Ocean and Polar Research
  • Volume 34, Issue 2,  2012, pp.165-173
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2012.34.2.165
 Title & Authors
Effects of Starvation on the Morphometric Characteristics and Histological Changes in Chum Salmon (Oncorhynchus keta) Fry
Seong, Ki-Baik; Park, In-Seok; Goo, In-Bon; Kim, Dong-Soo;
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A 26 day experiment was conducted to determine the effects of feeding and starvation on the survival, morphology, and histology in chum salmon (Oncorhynchus keta) fry. We included three experimental groups: starved, fed, and initial. The survival and growth rates were lower in the starved group than in the fed group (P < 0.05). In the starved group, survival began to decline after 16 days, and all fish had died after 26 days. We determined the effects of starvation on the morphometric parameters using the truss and classical dimensions. The dimensions in the head region were larger in the starved group than in the initial and fed groups. In contrast, the truss dimensions of the fed group were larger than those of the initial and starved groups. Starvation reduced the heights of the hepatocyte nuclei and of the intestinal epithelium (P < 0.05). The starved group also showed atrophy of the digestive structures and shrinkage of the foregut and midgut. Starvation led to the degeneration and atrophy of the exocrine pancreas, in which the lumen was markedly diminished and the folds of mucosa were less apparent. The hepatocyte morphology in the starved group was abnormal compared with that of the initial and fed groups, with highly compact, irregularly shrunken nuclei. Melanomacrophages were randomly distributed in the kidneys of the starved group, and their abundance increased rapidly during the experiment. In contrast, neither the initial nor fed group had any melanomacrophages. These results suggest that the nutritional parameters used in this study are useful indices of nutritional status in chum salmon.
chum salmon (Oncorhynchus keta);histological change;morphometric characteristics;starvation;
 Cited by
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