Marking Post-larval Paralichthid Flounders with Radioactive Elements
- 1 April 1967
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 96 (2) , 151-156
- https://doi.org/10.1577/1548-8659(1967)96[151:mppfwr]2.0.co;2
Abstract
The problem of marking post‐larval flounder (Paralichthys spp.) with radioisotopes was approached in two ways: (1) by marking with radioactive cerium and cobalt, and (2) by increasing the concentration of stable cobalt in the fish and then making it radioactive through exposure to neutrons in a nuclear reactor (activation analysis). In the first approach, both cerium 144 and cobalt 60, introduced into the food or water, were used satisfactorily as marks for post‐larval flounder. The radioactivity obtained from the water was retained longer than that obtained from food. The amount of cerium accumulated by the fish in 24 hours did not increase when the concentration of cerium 144 was raised from 0.4 to 1.0 µc/ml of sea water, but the amount of cobalt 60 accumulated increased when the concentration was raised from 0.01 to 1.0 µc/ml of sea water. In the second approach, fish were marked by holding them for 24 hours in sea water with different concentrations of stable cobalt. Fish held 24 hours in sea water containing 15.62 µg of stable cobalt per ml of sea water and then held for 36 days in flowing sea water contained enough stable cobalt to be identified in the laboratory by activation analysis.This publication has 0 references indexed in Scilit: