Determination of lethal dissolved oxygen levels for selected marine and estuarine fishes, crustaceans, and a bivalve

2002 ◽  
Vol 140 (2) ◽  
pp. 287-296 ◽  
Author(s):  
Miller D. ◽  
Poucher S. ◽  
Coiro L.
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Levels ◽  
Estuarine Fishes

scholarly journals Growth of Spiny Lobster Panulirus homarus Fed with Moist Diet

2018 ◽  
Vol 3 (2) ◽  
pp. 95
Author(s):  
Asep Ridwanudin ◽  
Varian Fahmi ◽  
Idham Sumarto Pratama
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Spiny Lobster ◽  
Growth And Survival ◽  
Oxygen Levels ◽  
Hypoxic Conditions ◽  
National University ◽  
Oxygen Conditions ◽  
Measure Oxygen Consumption

Oxygen is a vital parameter in aquaculture activities. The decrease of dissolved oxygen levels in aquaculture media should be highly observed, since very low dissolved oxygen conditions (hypoxia) could negatively affect to the growth and survival of fish. Therefore, research on the condition of hypoxia is very important to be studied. This study was conducted in January-February 2013 at the Laboratorium of Fish Reproductive Physiology, Pukyong National University, South Korea to measure oxygen consumption in tilapia Oreochromis niloticus (total length: 14.2 ± 1.4 cm, weight: 31.3 ± 2.0 g) under normal conditions (normoxia) and hypoxia. Measurement was conducted using respirometer (dimension: 20 × 17,5 × 10 cm; volume: 3,5 L) every 10 minutes during four hours of observation. Experiment was conducted with three replications. The results showed that oxygen consumption of tilapia fingerlings in hypoxia conditions (12.09 ± 3.20 mg O2/kg/h) was lower than normoxia (35.67 ± 4.19 mg O2/kg/h) (P<0.01). Continuous hypoxic conditions could negatively affect fish movements, which could ultimately lead to mortality when dissolved oxygen levels are very low. Meanwhile, the results on determination of critical oxygen levels for tilapia showed a dissolved oxygen range of 1.9 ± 0.5 mg/L

Statistical Comparison of Multiple Methods for the Determination of Dissolved Oxygen Levels in Natural Waters

2002 ◽  
Vol 7 (3) ◽  
pp. 146-148 ◽  
Author(s):  
Matthew E. Johll ◽  
David Poister ◽  
Jill Ferguson
Keyword(s):  
Dissolved Oxygen ◽  
Natural Waters ◽  
Multiple Methods ◽  
Statistical Comparison ◽  
Oxygen Levels

scholarly journals Effects of Hypoxia on Oxygen Consumption of Tilapia Fingerlings (Oreochromis niloticus)

2018 ◽  
Vol 3 (2) ◽  
pp. 165
Author(s):  
Vitas Atmadi Prakoso ◽  
Young Jin Chang
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oreochromis Niloticus ◽  
Growth And Survival ◽  
Oxygen Levels ◽  
Hypoxic Conditions ◽  
National University ◽  
Oxygen Conditions ◽  
Measure Oxygen Consumption

Oxygen is a vital parameter in aquaculture activities. The decrease of dissolved oxygen levels in aquaculture media should be highly observed, since very low dissolved oxygen conditions (hypoxia) could negatively affect to the growth and survival of fish. Therefore, research on the condition of hypoxia is very important to be studied. This study was conducted in January-February 2013 at the Laboratorium of Fish Reproductive Physiology, Pukyong National University, South Korea to measure oxygen consumption in tilapia <em>Oreochromis niloticus</em> (total length: 14.2 ± 1.4 cm, weight: 31.3 ± 2.0 g) under normal conditions (normoxia) and hypoxia. Measurement was conducted using respirometer (dimension: 20 × 17,5 × 10 cm; volume: 3,5 L) every 10 minutes during four hours of observation. Experiment was conducted with three replications. The results showed that oxygen consumption of tilapia fingerlings in hypoxia conditions (12.09 ± 3.20 mg O<sub>2</sub>/kg/h) was lower than normoxia (35.67 ± 4.19 mg O<sub>2</sub>/kg/h) (P&lt;0.01). Continuous hypoxic conditions could negatively affect fish movements, which could ultimately lead to mortality when dissolved oxygen levels are very low. Meanwhile, the results on determination of critical oxygen levels for tilapia showed a dissolved oxygen range of 1.9 ± 0.5 mg/L.

A Survey for Salinity Intrusion and Pollution Assessment in Maputo Estuary

1987 ◽  
Vol 19 (5-6) ◽  
pp. 823-832 ◽  
Author(s):  
J. M. Salomão
Keyword(s):  
Dissolved Oxygen ◽  
Industrial Wastewater ◽  
Pollution Assessment ◽  
Saturation Level ◽  
Salinity Intrusion ◽  
Pollutant Load ◽  
Oxygen Levels ◽  
Salinity Gradients

Following surveys recently carried out in Maputo estuary, a survey with the purpose of acquiring data required to characterize the estuary was carried out in December 1983. After reviewing the hydrology of the tributaries to the estuary, the parameters to be monitored - salinity, conductivity, temperature, and dissolved oxygen, are referred. Finally, taking also into account previous information available, an evaluation of the results, and an assessment of the estuary are done. The estuary can be classified as well mixed, since the vertical salinity gradients found are small. The Umbeluzi estuary, however, is partially mixed. Temperature decreases with the depth, and when moving downstream. Some pollution was found along the lower part of the estuary, probably due to the discharge of domestic and industrial wastewater, which brings the dissolved oxygen figures below the saturation level. As for the upper part of the estuary, the dissolved oxygen levels are not only dependent on the pollutant load, but also on the growing of algae, which by photosynthesis under daylight produce oxygen that dissolves into the water. Quite often, the dissolved oxygen figures are above the saturation level. The growth of algae could be due to the input of phosphorus and nitrogen brought in by the tributary streams. A pollutant load discharged upstream could be the reason for some pollution seen in the Umbeluzi estuary.

Direct determination of dissolved oxygen in soil water by gas chromatography

1977 ◽  
Vol 47 (1) ◽  
pp. 265-268 ◽  
Author(s):  
M. Yamaguchi ◽  
Y. Komatsu
Keyword(s):  
Gas Chromatography ◽  
Dissolved Oxygen ◽  
Soil Water ◽  
Direct Determination
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