海産魚のチアミナーゼIの研究-V

カタクチイワシによるハマチの栄養性患とB₁の添加効果(1)

抄録

It is well known that yellowtail fed raw anchovy as the sole feedings stuff for long periods develop a disease characterized by high mortality and retarded growth. The disease is considered to be a thiamine deficiency caused by the thiaminase present in raw anchovy.
The present study was undertaken to clarify the preventive effect of thiamine on the disease in yellowtail. Yellowtail with an average weight of 16 g were fed raw anchovy with or without added thiamine for 57 days. The thiamine used is coated with fat in order to prevent its decomposition by the thiaminase. The results obtained can be summarized as follows:
1. The fish fed raw anchovy during the entire period showed growth retardation and high mortality. At the end of the experiment, the survival rate was 13.4% and the average weight, 34g.
2. The fish receiving the thiamine supplement during the entire period showed good growth and low mortality. At the termination of the feeding trial, their average weight was 114 g and the survival rate, 95 %. The fish given mackerel, horse mackerel and sand launce which contain no thiaminase also showed good growth and low mortality.