Mercury Levels in the Sunfish, Lepomis gibbosus, Relative to pH and Other Environmental Variables of Precambrian Shield Lakes

1983 ◽  
Vol 40 (10) ◽  
pp. 1737-1744 ◽  
Author(s):  
Christopher D. Wren ◽  
Hugh R. MacCrimmon
Keyword(s):  
Growth Rate ◽  
Muscle Tissue ◽  
Environmental Variables ◽  
Total Mercury ◽  
Acid Stress ◽  
Lepomis Gibbosus ◽  
Pumpkinseed Sunfish ◽  
South Central ◽  
Water Ph ◽  
Shield Lakes

Growth rate and total mercury concentrations were determined in muscle tissue of pumpkinseed sunfish (Lepomis gibbosus) collected from 16 waters in south-central Ontario. Mean water pH ranged from 5.6 to 8.4. Growth rate is correlated positively with lake pH, whereas fish mercury levels are higher at lower pH. Differences in growth rate may be the result of both metal and acid stress in the lower pH waters. Pumpkinseed mercury levels can be accurately described by an equation incorporating chemical and physical lake variables.

Life history and distribution of mayflies (Ephemeroptera) in some acid streams in south central Ontario, Canada

1991 ◽  
Vol 69 (4) ◽  
pp. 899-910 ◽  
Author(s):  
Donna J. Giberson ◽  
Rosemary J. Mackay
Keyword(s):  
Life History ◽  
Life Histories ◽  
Stream Water ◽  
Acid Stress ◽  
South Central ◽  
History Analysis ◽  
Water Ph ◽  
Acid Streams ◽  
Stream Size ◽  
Ph Range

Life histories and distribution of mayflies (Insecta: Ephemeroptera) were investigated in 11 streams in south central Ontario that ranged from highly acidic to circumneutral. At least 29 mayfly species were recorded from the streams, with 16 common enough for life history analysis. Mayfly distribution and diversity were correlated with pH regime and stream size. No mayflies were found in the smallest, most acid stream, and numbers of mayfly species and their relative abundances generally increased with both increasing stream size and stream pH. Incorporation of life cycle information with distributional data enabled us to determine the precise stream-water pH range encountered by different mayfly life stages in the study streams. Generally, during the period of greatest acid stress in the streams (pH depressions associated with spring snowmelt) the mayflies were present in large or dormant stages, which are believed to be more tolerant of lowered pH.

Assessment of caudal fin clip as a non-lethal technique for predicting muscle tissue mercury concentrations in largemouth bass

2008 ◽  
Vol 5 (3) ◽  
pp. 200 ◽  
Author(s):  
S. A. Ryba ◽  
J. L. Lake ◽  
J. R. Serbst ◽  
A. D. Libby ◽  
S. Ayvazian
Keyword(s):  
Rhode Island ◽  
Muscle Tissue ◽  
Largemouth Bass ◽  
Total Mercury ◽  
Micropterus Salmoides ◽  
Mercury Contamination ◽  
Caudal Fin ◽  
Minimal Impact ◽  
Fish Consumption Advisories ◽  
Relationship Of

Environmental context. In the development of fish consumption advisories, fisheries biologists routinely sacrifice fish and analyse muscle fillets in order to determine the extent of mercury contamination. Such lethal techniques may not be suitable for endangered species or limited fish populations from smaller-sized water bodies. We compared the measured total mercury concentrations in tail fin clips to that of muscle fillets and illustrated that tail fin clips may be used as an accurate tool for predicting mercury in muscle tissue. This is the first study on the use of tail fin clips to predict mercury levels in the muscle tissue of largemouth bass with minimal impact on the fish. Abstract. The statistical relationship between total mercury (Hg) concentration in clips from the caudal fin and muscle tissue of largemouth bass (Micropterus salmoides) from 26 freshwater sites in Rhode Island, USA was developed and evaluated to determine the utility of fin clip analysis as a non-lethal and convenient method for predicting mercury concentrations in tissues. The relationship of total Hg concentrations in fin clips and muscle tissue showed an r2 of 0.85 and may be compared with an r2 of 0.89 for Hg concentrations between scales and muscle tissue that was determined in a previous study on largemouth bass. The Hg concentration in fin clip samples (mean = 0.261 μg g–1 (dry)) was more than a factor of twenty greater than in the scale samples (mean = 0.012 μg g–1 (dry)). Therefore, fin clips may be a more responsive non-lethal predictor of muscle-Hg concentrations than scale in fish species which may have reduced Hg concentrations.

Muscle metabolism of freshwater fish, Tilapia mossambica (Peters), during acute exposure and acclimation to sublethal acidic water

1981 ◽  
Vol 59 (10) ◽  
pp. 1909-1915 ◽  
Author(s):  
V. Krishna Murthy ◽  
P. Reddanna ◽  
M. Bhaskar ◽  
S. Govindappa
Keyword(s):  
Freshwater Fish ◽  
White Muscle ◽  
Glycogen Content ◽  
Acid Stress ◽  
Muscle Metabolism ◽  
Acute Exposure ◽  
Tilapia Mossambica ◽  
Red Muscle ◽  
Water Ph ◽  
Red And White Muscles

Freshwater fish, Tilapia mossambica (Peters), were subjected to acute exposure and acclimation to sublethal acid water (pH 4.0), and the muscle metabolism was investigated. Differential patterns of carbohydrate metabolism were witnessed in the red and white muscles in response to both acute exposure and acclimation. The glycogen content of red muscle was elevated whereas that of white muscle was depleted on acute exposure. But on acclimation, both the muscles had elevated glycogen content. The red muscle seems to mobilize carbohydrates into both hexose mono- and di-phosphate pathways, but white muscle does so only into the hexose monophosphate pathway on acclimation. In general, both the muscles exhibited suppressed glycolysis and elevated oxidative phase leading to elevated glycogen level. The muscle metabolism was oriented towards conservation of carbohydrates and lesser production of organic acids on acclimation, as a possible metabolic adaptive mechanism of the fish, enabling them to counteract the imposed acid stress.

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