The residence time of stocked hatchery‐reared brown trout,Salmo truttaL., and rainbow trout,Oncorhynchus mykiss(Walbaum), in Lake Trawsfynydd, and their accumulation of radioactive caesium
作者:
J.R.J. TIPPLE,
D.R.P. LEONARD,
期刊:
Fisheries Management and Ecology
(WILEY Available online 1995)
卷期:
Volume 2,
issue 1
页码: 1-10
ISSN:0969-997X
年代: 1995
DOI:10.1111/j.1365-2400.1995.tb00092.x
出版商: Blackwell Publishing Ltd
关键词: stock trout;put‐and‐take;radioactive caesium;residence time;lake fishery;Salmo trutta;Oncorhynchus mykiss
数据来源: WILEY
摘要:
AbstractSmall amounts of radioactivity in liquid effluent are discharged under authorization into Lake Trawsfynydd in north Wales. MAFF inspectors from the Directorate of Fisheries Research (DFR) advise the Welsh Office on the terms of authorization and on the power station operators' compliance with them. DFR also has the responsibility for environmental monitoring, including fish caught for consumption. Trout angling is particularly popular in Lake Trawsfynydd, and because of angling pressure, additional brown trout,Salmo truttaL., and rainbow trout,Oncorhynchus mykiss(Walbaum), need to be introduced. An important factor in determining the concentration of radionuclides in these fish is the length of time that they spend at liberty. During the fishing season, samples of these stocked trout were tagged and released to assess the average residence time. This was found to be 6 days for rainbow trout and 10 days for brown trout. Less than 7% of the recaptured stocked trout of either species had a residence time of more than 20 days. Radiocaesium concentrations in recaptured trout were very low. Trout which avoided recapture and overwintered in the lake were found to have radiocaesium concentrations similar to those of indigenous trout sampled at the same time.
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