The distribution of zinc, copper and lead in
Pneumatophorus tapeinocephalus, (Gomasaba),
Seriola quinqueradiata (Buri),
Trachurus trachurus (Ma-aji),
Pneumatophorus Japonicus (Honsaba) and
Chrysophrys major (Madai) were investigated.
In these fishes zinc is most abundant, copper is less rich and lead is least, and these facts are also the same as in
Kastuwonus pelamis, Monocentris japonica and deep-sea fishes. The parts containing zinc as oxide more than 0.5% of the ashes are as follows: Pancreas and flesh (between ribs) of
Seriola quinqueradiata, and pyloric coeca of
Pneumatophorus tapeinocephalus. The parts less rich in zinc are the heart and flesh of
Pneumatophorus tapeinocephalus, and the liver of
Trachurus trachurus (large). Flesh usually contains zinc about 3-5 times as much as bone. Copper is generally rich in inner organs, and poor in hard parts such as bone, gills and scales. Copper is especially rich in such parts as testes and the liver of
Pneumatophorus tapeinocephalus, flesh of
Trachurus trachurus (large), total inner organs of
Trachurus trachurus (small), and the pyloric coeca and stomch of
Pneumato-phorus japonicus. Lead is richest in the heart and liver of
Trachurus trachurus (large) but scarcely found in the heart of
Pneumatophorus tapeinocephalus.
Scales or cuticles of
Chrysophrys major, Seriola quiqueradiata and
Trachurus trachurus (large) contain comparatively much lead, and that amounts to about 5 times as much as cop-per. In the eyes of
Chrysophrys major and
Seriola quinqueradiata lead is also comparati-vely much contained and richer than copper. The quantities of lead in both cases are almost the same, but copper is richer in Seriola quinqueradiata than in
Chrysophrys major.
The quantities of zinc, copper and lead are nearly close respectively in stomachs and in pyloric coecas of these fishes, and it is perhaps the reason for the above mentioned facts that these two parts situate close together in the body of fish and are in intimate relations.
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