Change of Electric Resistance of Fish-Body during Storage
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概要
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Four individuals of carp, Cyprinus carpio, were killed by destroying the brain and stored at 10°, 15°, 20°, and 25°C. respectively. Their electric resistance was measured from time to time by putting one platinum electrode, 1cm. in length and 0.7mm. in diameter, through either 5th or 20th scale on the lateral line and the other platinum electrode of the same dimensions through the skin at a distance of 2cm. from the former either dorsally, ventrally, anteriorly, or posteriorly. The circuit was closed as shown in Fig. 1. The electric resistance remained constant for varying intervals according to the temperature of storage, and then fell in such manners as illustrated in Fig. 2. The temperature coefficient for the duration of the initial constant electric resistance was found to be 3.9 according to Arrhenius's formula. It should be noted in this connexion that the expressed juice of fish-meat, kept at various temperatu es, did not show any change of electric resistance, but a fish, having been frozen at -21°C. for four days, was found decidedly less resistant electrically when thawed at 25°C. The change of e ?? ectric resistance of fish-body during the storage seems, therefore, not due to augmentation or diminution of the disintegration products in the fish-body but to some physical or physico-chemical changes of the tissues caused by either autolysis or both autolysis or both autolysis and bacteri ?? l decomposition.
- 社団法人 日本水産学会の論文