Effects of Blood Sampling on the Hematocrit Value in the Carp and Trials of Blood Transfusion for Prevention of Anemia

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  • コイのヘマトクリット値に対する採血の影響と貧血防止策としての輸血の試み
  • コイ ノ ヘマトクリットチ ニ タイスル サイケツ ノ エイキョウ ト ヒンケ

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Abstract

Effects of blood sampling on the hematocrit value (Ht) were investigated at 23-25℃ with carp, Cyprinus carpio, weighing 500-800g. Blood transfusion was tried as a means to prevent anemia due to blood sampling. The results obtained were as follows: 1. Blood was taken from a single fish at the ratio of 0.2 ml/100gBW every 1.5 hours. In 1.5 hours after the third sampling, Ht decreased 29-31% from the initial level. 2. After blood was taken from a single fish at the ratio of 0.2 ml/100gBW, all the blood taken was put back into the blood vessel of the same fish at once. This sham blood sampling was carried out every 1.5 hours. In 1.5 hours after the third sham sampling, Ht decreased 8-17% from the initial level. This decrease in Ht was smaller than that of the fish which lost 0.6ml of blood per 100g body weight by actual sampling of three times. 3. After blood was taken from a single fish at the ratio of 0.2 ml/100gBW, the same amount of blood was transfused to the fish from another one. In three of the four trials, the respiratory frequency of the fish markedly increased, and two of the three fish lost balance of the body. 4. Blood was taken from single fish at the ratio of 1.5-2.0 ml/100gBW corresponding to 23-31% of the total blood volume. One to four days after the blood sampling, Ht decreased 38-55% from the initial level. 5. After blood was taken from a single fish at the ratio of 1.7-2.0 ml/100gBW (10-13ml/fish), all the blood taken but 0.2 ml was put back into the blood vessel of the same fish at once. The blood of 0.2 ml was used for measurement of Ht. After the sham blood sampling, Ht did not fluctuate substantially for 6-11 days. 6. After blood was taken from a single fish at the ratio of 1.5-2.0 ml/100gBW, the same amount of blood was transfused to the fish from another one. Eleven trials of the transfusion were carried out. In six trials, Ht did not change substantially from the initial level for the period from 6 to 19 days after the transfusion. In these cases, the blood transfusion is considered to have been effective to some extent. In other five trials, Ht decreased 39-65% from the initial level at sixth day after the transfusion. In these cases, the blood transfusion is considered not to have been effective to prevent anemia. Different types of blood have not been reported in the carp. The present results, however, suggested that blood incompatibility was possible between different individuals of carp.

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