The expressible fluid of fish fillets. III. —Nucleic acid from unfrozen cod under various conditions

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Abstract
Deoxypentosenucleic acid (DNA) was determined in the expressible fluid of cod fillets after various treatments. Both size of fillet and time of storage in ice affected the values obtained, so standardization of these factors was considered essential to the study of cell damage by means of DNA measurements. It was concluded that the cell breakdown occurring in fish kept for many days in ice was caused by bacterial action, not autolysis. The expressible fluid itself was found to consist mainly of intercellular fluid, plus a little plasma exuding from the cut ends of the cells. The DNA appeared to be in true solution, although probably aggregated to some extent.