Seasonal Changes in the Contents of Proximate Composition, Minerals and Vitamins of Firefly Squid.

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  • ホタルイカの一般成分，無機質およびビタミン含有量の季節的変化
  • ホタルイカ ノ イッパン セイブン ムキシツ オヨビ ビタミン ガンユウリョウ

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The contents of proximate composition, minerals and vitamins of firefly squids which were caught at offshore of 6 prefectures from January to July in 1988 were analyzed. Seasonal changes in the contents of lipid, copper (Cu), manganese (Mn) and vitamins of firefly squids were observed. The lipid contents reached the maximum value in April or May. The change in lipid contents of firefly squids was coincided with that in their liver lipid. The contents of Cu and Mn increased from March to July. Especially the Cu contents in July were about twice as much as those in March. It was assumed that the increase of Cu contents of the whole body was dependent on those of the liver. The vitamin B1 contents also increased from March to May and were almost unchanged thereafter. The increase of the vitamin B1 contents was in good accordance with the change of thiamin contents, while the contents of 2-(1-hydroxyethyl) thiamin (HET) didn't change through the sampling period. On the other hand, the retinol contents reached the maximum value in April or May, and the tocopherol contents increased with the sampling period. The mantle length and the body weight of firefly squids increased through the sampling period, and firefly squid spawns from March to June. It was, therefore, suggested that the changes in the nutritive components described above were related with the growth and the spawning of firefly squid.

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