Predicting Early Morning Dissolved Oxygen Concentrations in Channel Catfish Ponds

Abstract

Consumption of O2by planktonic communities of pond waters may be predicted from chemical oxygen demand (COD) and temperature (r 2 -0.85). In ponds where planktonic organisms are the major source of turbidity, Secchi disk visibility may also be used to estimate COD (r 2 -0.81) or consumption of O2 by planktonic communities (r 2 = 0.82). A computer simulation model for nighttime decline in dissolved oxygen (DO) concentrations was developed for channel catfish ponds. This model incorporated data on plankton respiration from the present study, data from the literature on respiration by fish, respiration by organisms in the mud, and O2 diffusion. The validity of the model was tested for two catfish ponds. Measured and calculated DO concentrations usually agreed within -+10%. Secchi disk visibility determination should be used in the computer simulation to estimate O2 consumption by plankton whenever possible. However, COD values may be used when ponds contain appreciable clay turbidity. Series of tables were prepared which give the minimum acceptable Secchi disk visibility and the maximum permissible COD which may be tolerated in a particular pond without danger of DO depletion during the night. These tables will be useful to fish pond managers. A simple, graphical technique for estimating DO concentrations at dawn from DO measurements made at dusk and 2 to 3 h later also gave good estimates of nighttime DO decline. Although this technique has several limitations. it will be useful when it is not possible to measure COD and when Secchi disk measurements cannot be used to estimate O2 consumption by plankton. Can. 32:1283-1288. BOYD. C. E. 1973. The chemical oxygen demand of' waters and biological materials from ponds. Trans. Am. Fish. Soc. 102:606•511. ß 1976. Evaluation of a water analysis kit. Auburn Univ. Agric. Exp. Sta., Auburn, Ala. Leaflet 92.3 pp. ß 1977. Evaluation of a water analysis kit. J. Environ. Qual. 6:381-384. --, E. E. PRATHER, AND R. W. PAaI½S. 1975. Sudden mortality of a massive phytoplankton bloom. Weed Sci. 23:61•57.

Effect of Oxytetracycline on Thai Silver Barb (Barbonymus gonionotus) and on it’s Culture Environment

“…Further study is needed to make precise understanding about antibiotics effects on water quality parameters. Results was reported for temperature 22-37°C (Del Nery et al, 2013) and 25.8±1.0°C and pH 7.6±0.2 (Castine et al, 2012) and 6.2-9.2 (Losordo and Piedrahita, 1991), DO = 7±2 mg LG 1 (Boyd et al, 1978) and 3-5 mg LG 1 (Diana et al, 1991). Total hardness ranges from 822.33±1.52-769.66±2.08 mg LG 1 (Fig.…”

Oxygenation zones in conventional and split earthen catfish ponds in eastern Arkansas

“…The DO values recorded by the data loggers would not have fallen below the threshold in that short amount of time. This is supported by the Boyd et al (1978) model in which their predicted and measured DO (mg/L) did not begin to approach critical levels until into the early morning hours because the decline was linear over time. The OZ volume began to decline over the night and reached the lowest levels in the early morning.…”

Factors Affecting Metabolism of Commercial Channel Catfish Ponds as Indicated by Continuous Dissolved Oxygen Measurement1

“…As only one depth was sampled in this study, the results presented here represent an approximation of NPP and WPR. The general approach was similar to that described by Boyd et al (1978), who demonstrated the accuracy of a projection technique based on an assumed linear nocturnal decline in DO concentration.…”