Estimating biological half-lives of 137 Cs in a cyprinid fish Tribolodon hakonensis by a one-compartment model consideri
- PDF / 1,007,418 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 73 Downloads / 138 Views
ORIGINAL ARTICLE Environment
Estimating biological half‑lives of 137Cs in a cyprinid fish Tribolodon hakonensis by a one‑compartment model considering growth dilution effect Kouji Niizeki1,6 · Toshihiro Wada2 · Kenji Nanba2,3 · Keiichi Sasaki1 · Wataru Teramoto1 · Shigehiko Izumi1 · Hirotaka Nomura4 · Naohiko Inatomi5 Received: 15 May 2020 / Accepted: 10 July 2020 © Japanese Society of Fisheries Science 2020
Abstract Japanese dace Tribolodon hakonensis rearing experiments were conducted to estimate parameters related to 137Cs uptake and excretion processes. Fish (initial mean total length 256 mm, 136 g) were reared at 20 °C for 182 days using the same daily ingestion rate (1% of body weight for 6 days per week) with three feeding regimens: feeding contaminated pellets (80.7 Bq/kg-dry of 137Cs) throughout the experiments (137Cs uptake group), feeding contaminated and non-contaminated pellets respectively for days 0–40 and days 42–180 (137Cs uptake–excretion group), and feeding non-contaminated pellets throughout the experiments (control group). Samples were taken periodically. The 137Cs concentrations in muscle tissues (MU) and whole bodies (WB) were measured using Ge detectors. The 137Cs concentrations in fish that had grown to 240 g by day 182 reached 45.5 Bq/kg-wet in MU and 37.0 Bq/kg-wet in WB in the 137Cs uptake group. A one-compartment model incorporating the growth coefficient estimated that the biological half-lives of 137Cs in MU and WB excluding the growth dilution effect (216 days and 233 days, respectively) were longer than the apparent biological half-lives (100 days and 104 days) observed in the 137Cs uptake–excretion group. The developed method can contribute to promoting precise prediction of radiocesium contamination of fish affected by the Fukushima fallout. Keywords Biological half-life · Freshwater fish · Japanese dace · One-compartment model · Radiocesium contamination · Rearing experiment Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12562-020-01452-y) contains supplementary material, which is available to authorized users. * Toshihiro Wada t‑[email protected]‑u.ac.jp 1
Fukushima Prefectural Inland Water Fisheries Experiment Station, Inawashiro, Fukushima 969‑3283, Japan
2
Institute of Environmental Radioactivity, Fukushima University, Fukushima, Fukushima 960‑1296, Japan
3
Faculty of Symbiotic Systems Science, Fukushima University, Fukushima 960‑1296, Japan
4
The Demonstration Laboratory, Marine Ecology Research Institute, Kashiwazaki, Niigata 945‑0017, Japan
5
Central Laboratory, Marine Ecology Research Institute, Onjuku, Chiba 299‑5105, Japan
6
Present Address: Agricultural Promotion Division of the Fukushima Prefectural Government, Fukushima, Fukushima 960‑8670, Japan
Introduction After the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident in March 2011, large amounts of radionuclides were released into the atmosphere. Subsequently, some were deposited throughout wide areas of eastern Japan, especially in F
Data Loading...
