Influence of dissolved oxygen levels on acute toxicity of phenolic compounds to fresh water teleost,Notopterus notopterus (PALLAS)

1983 ◽  
Vol 19 (3) ◽  
pp. 223-228 ◽  
Author(s):  
Saroj Gupta ◽  
R. C. Dalela ◽  
P. K. Saxena
Keyword(s):  
Phenolic Compounds ◽  
Acute Toxicity ◽  
Dissolved Oxygen ◽  
Fresh Water ◽  
Oxygen Levels ◽  
Fresh Water Teleost ◽  
Notopterus Notopterus

scholarly journals Hematology of the Freshwater Fish, Notopterus notopterus in Relation to Physico-Chemical Characteristics of the Water

2015 ◽  
Vol 40 ◽  
pp. 19-23 ◽  
Author(s):  
R.S. Kulkarni
Keyword(s):  
Dissolved Oxygen ◽  
Freshwater Fish ◽  
Fresh Water ◽  
Environmental Temperature ◽  
Normal Values ◽  
Chemical Characteristics ◽  
Fresh Water Fish ◽  
Physico Chemical ◽  
Water Fish ◽  
Notopterus Notopterus

Hematological and some biochemical contents of the blood in relation to physico-chemical characteristics of the water have been studied in the fresh water fish, Notopterus notopterus. The results indicated that normal values have been found in comparison to the studies carried out in other fishes. Hence, the fish Notopterus notopterus is having favorable environmental temperature, pH and dissolved oxygen required for the fish to survive and regulate breeding activities.

Correlation of dissolved oxygen levels, fresh-water flows and temperatures in a polluted estuary

1969 ◽  
Vol 3 (2) ◽  
pp. 121-128 ◽  
Author(s):  
David W. Mackay ◽  
George Fleming
Keyword(s):  
Dissolved Oxygen ◽  
Fresh Water ◽  
Oxygen Levels ◽  
Water Flows

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.

Changing perceptions of the effect of plant phenolics on nutrient supply in the ruminant

1996 ◽  
Vol 47 (6) ◽  
pp. 829 ◽  
Author(s):  
JB Lowry ◽  
CS McSweeney ◽  
B Palmer
Keyword(s):  
Phenolic Compounds ◽  
Acute Toxicity ◽  
Protein Interactions ◽  
Nutrient Supply ◽  
Arid Environments ◽  
Plant Phenolics ◽  
Ruminant Nutrition ◽  
Forage Plants ◽  
Hydrolysable Tannins ◽  
Semi Arid

Mammalian metabolism of plant phenolics, initially studied in monogastric animals, gave an emphasis to their toxic and antinutrient effects. Subsequent studies in tropical ruminants and wild herbivores have highlighted the high levels than can occur in some diets and the extensive microbial modification and degradation that can occur in the tract. This paper reviews aspects of plant phenolics as they relate to ruminant nutrition in tropical or semi-arid environments in which some forage plants contain high levels of phenolic compounds. Effects range from occasional acute toxicity of hydrolysable tannins, to acetate-releasing microbial degradations that apparently enable certain phenolics to act as nutrients. The most important and complex effects are those due to tannin-protein interactions. Although these can clearly reduce feed intake, nutrient digestibilities, and protein availability, many of the interactions are still not understood. The diverse effects of plant phenolics on nutrient flow probably result from the balance between adverse effects on some organisms and the rate at which they are degraded or inactivated by other organisms, and improved animal performance can likely be obtained by manipulation of rumen microbial metabolism.

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