Pathway of Ca uptake and excretion by teleost fishes

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1. By using the radioisotope Ca45, the pathway of calcium flux was investigated in the crucian carp, Carassius carassius (L.) and a marine teleost, Duymaeria flagellifera (VALENCIENNES). 2. The medium in which the experimental fish was placed was isolated from the fish body in enclosing its posterior half with a rubber sac (fig. 1). For the observation of Ca45 uptake, Ca45Cl2 was added to one of the separated media. In the excretion experiment, the fish was first placed in Ca45 solution to let it take up the isotope and then transferred to non-isotopic medium. 3. The pattern of Ca45 uptake by the crucian carp seems to indicate that the Ca influx is made mainly through the gills and fins. In the case of crucian carp, when the anterior body is exposed to the medium containing Ca45, a considerable accumulation of Ca45is observed in the scales not only of the anterior body but also of the posterior body which is not directly exposed to the isotopic medium. On the other hand, when the posterior body is exposed to the isotopic medium, the accumulation by the posterior scales is apparently small even in the direct exposure to Ca45and that by the anterior scales is much smaller. These results may indicate that the uptake of Ca45 is much greater through the gills than that through the fins in the posterior body. 4. In the marine fish, D. flagellifera, the pattern of Ca45 uptake is remarkably different from that by the crucian carp. The amount of Ca45 uptake through the posterior body is nearly the same as that through the anterior body. This result may suggest that the Ca influx across the fins in this marine fish is much greater as compared with that in the crucian carp. 5. In the crucian carp, the amount of Ca45 excreted through the anterior half of the body is roughly equal to that through the posterior half.
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Pathway of Ca uptake and excretion by teleost fishes

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