Coronary-supplied compact shell of ventricular myocardium in salmonids: growth and enzyme pattern.

1. 1. The poikilotherm cardiac ventricle can consist of a spongy core supplied by lacunar blood and a compact shell supplied by coronaries. 2. 2. In the Atlantic salmon (Salmo salar) the relations between body weight, heart weight, ventricle volume and thickness and volume of the compact shell were studied. 3. 3. The proportion of compact tissue increases with the body weight. The rate of this increase is highest during the “smolt” stage. The proportion of compact tissue is not correlated to the ventricle volume. 4. 4. In the rainbow trout (Salmo gairdneri) the activity and isoenzyme pattern of lactate dehydrogenase are the same in the compact and spongy tissue in both summer and winter. 5. 5. The activity of cytochrome oxidase is stable in the compact tissue throughout the year and the same as in the spongy tissue in the winter. In the summer the cytochrome oxidase activity is lower in the spongy core.

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