農薬の微量定量用供試生物としてのモツゴとヒメダカ

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  • On the Two Kinds of the Fresh Water Fish, <i>Pseudorasbora parva</i> and <i>Oryzios latipes</i> as Materials of Bioassay
  • ノウヤク ノ ビリョウ テイリョウヨウキョウシセイブツ ト シテ ノ モツゴ ト ヒメダカ

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Two kinds of fresh water fish, Pseudorasbora parva and Oryzios latipes, were tested on the suitability to material of bioassay. First, the characters of their suscetibility were studied by affecting them with 24 kinds of pesticides. And it was shown that both kinds of fish were very susceptible to most of hydrochloric insecticides and some of other kinds. It was also observed that many of the fish poisoned with organophosphoric insecticides had crooked abdomens with internal bleeding which were not caused with other kinds of pesticides, while most of the fish poisoned with antibiotics showed neither hyperaction nor convulsion till they were killed.<br>Then the following bioassays were carried out, making use of the above-mentioned characters.<br>(1) PCP in water was traced and the controlling factors of its decomposition were studied with P. parva.<br>(2) Endrin residue on the persimon fruits and cabbage leaves was traced also with P. parva.<br>(3) The pond water supposed to be contaminated with Parathion was tested with O. latipes and a water-flea, Moina macrocopa, which are different from each other in the susceptibility to Parathion.<br>All these tests were performed with success, proving the possibility of using these fish as material of bioassay.

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