Graduate Thesis Or Dissertation
 

Development of mitochondria-rich cells in gill epithelium of coho salmon Oncorhynchus kisutch during seawater adaptation

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  • A study on the cellular differentiation of the gill structure in juvenile coho salmon (O. kisutch) with emphasis on the excretion of monovalent ions was performed upon animals maintained under both seawater and freshwater environments. 1. The excretion rate of sodium-24 was observed to be higher for animals adapted to sea water than for fresh water. 2. The rate of cellular renewal in the gill tissue determined through the utilization of tritiated thymidine that was incorporated into newly synthesized deoxyribonucleic acid. Animals adapted to seawater exhibited a greater rate of incorporation and turnover of labeled deoxyribonucleic acid than the freshwater animals. 3. Isolation and assay of enzymatic activity of gill mitochondria obtained from animals of the two different salinities suggested that seawater animals had a greater mitochondrial activity. 4. These experimental findings support the concept that during the adaptation to a hyperosmotic environment, the rise in the osmotic and ionic properties of the internal body fluids causes an acceleration of cellular differentiation within the gill filamental epithelium. This could result in either the formation of new cells laden with mitochondria and /or increased mitochondrial activity in the existing mitochondria-rich cells.
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file details LinDavidHungYu1966_Redacted.pdf 2017-08-16 Pubblico Scaricare