Synopsis: In fishes their blood corpuscle resistance to hypotonic NaCl solution varies according to the grades of dyspnoea and other causes. Experiments to determine the blood corpuscle resistance were carried out and the following results were obtained.
1. In
Cyprinus carpio, when free oxygen in the water was consumed, blood corpuscle resistance decreased while hemoglobin content increased.
2. In
Mugil cephalus, Cyprinus carpio and
Carassius auratus, when they were taken out of water and exposed to the air, the blood corpuscle resistance decreased according to Pfeiffer's formula, log1/
A-X=K+Ct, where A, K and C are constants peculiar to the fish kind,
t is the time of exposure and
X is blood corpuscle resistance.
3. In
Carassius auratus when put in muddy water, blood corpuscle resistance decreased while hemoglobin content increased.
Judging from above results it can be said that blood corpuscle resistance decreases in dyspnoea.
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