Farmed tilapia Oreochromis mossambicus involved in transport and biouptake of arsenic in aquacultural ecosystems
Resource
Aquaculture 242 (1-4): 365-380
Journal
Aquaculture
Journal Issue
242
Pages
365-380
Date Issued
2004
Date
2004
Author(s)
Chen, Bo-Ching
Abstract
The present study couples the Michaelis-Menten (M-M) type flux and the Fick's type of dynamic mass transfer flux to arrive at the Best equation to quantitatively model the transport and biouptake mechanism of the gills of freshwater tilapia (Oreochromis mossambicus) exposed to waterborne arsenic (As). We conducted a 15-day uptake/depuration bioassay to examine the accumulation kinetics of As in tilapia gills by incorporating a bioconcentration model to obtain the steady-state and dynamic bioconcentration factors. A diffusion-based permeability can be calculated using the physiological and allometric-related parameters. The bioaffinity parameter and the limiting uptake flux in M-M equation are acquired by fitting the experimental values from published literature. The biouptake rate incorporating with bioavailability number is examined to better understand the effects of variabilities of field circumstances on biouptake flux. A linear relationship between As biouptake rate and As concentration in ambient water is obtained. The fitted bioaffinity parameter and limiting uptake flux were 3.07 mg l -1 and 2.17 mg l -1 day -1, respectively, suggesting a low As binding affinity of tilapia gills yet a relative high binding capacity was obtained. The As permeability through tilapia gills membrane decreased from 1.42 μm day -1 to a steady-state value of 0.82 μm day -1 after 2 months, indicating the nonequilibrium aspects of biouptake processes involved. © 2004 Elsevier B.V. All rights reserved.
Subjects
Arsenic; Bioavailability; Biouptake; Tilapia
Other Subjects
aquaculture; arsenic; biological uptake; Oreochromis; Oreochromis mossambicus; Tilapia
Type
journal article
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