Mercury Concentration of White Muscle in Relation to Age, Growth, and Condition in Four Species of Fishes from Clay Lake, Ontario

1974 ◽  
Vol 31 (11) ◽  
pp. 1723-1729 ◽  
Author(s):  
D. P. Scott
Keyword(s):  
Mercury Concentration ◽  
White Muscle ◽  
Species Differences ◽  
Lake Ontario ◽  
Age And Growth ◽  
Coregonus Clupeaformis ◽  
Catostomus Commersoni ◽  
First Order ◽  
Species Area ◽  
Statistical Relationships

Studies of large (about 125) samples of walleye (Stizostedion vitreum), northern pike (Esox lucius), white sucker (Catostomus commersoni), and lake whitefish (Coregonus clupeaformis) from each of four areas of Clay Lake, Ontario, a highly mercury-contaminated lake, have confirmed previous findings that the larger the fish, the greater the white muscle mercury concentration, within species, within populations. This relationship was statistically broken into separate age:concentration and growth:concentration partial regressions; older fish and faster growing fish were generally more contaminated, subject to the above species–area restrictions. However, the generally positive correlation between concentration and condition (as measured by relative heaviness of individuals within area–species samples) found in the previous study is here contradicted; relatively heavier fish tended to have lower Hg concentrations. Despite the relatively small size of the lake (about 11 × 2 km) analyses of multiple covariance indicated profound within-species differences between the samples from the four areas. However, there did not appear to be any obvious correlation between these differences and sediment mercury values.The various statistical relationships do not appear to be simple, first-order regressions; rather, there appear to be significant interactions between age and growth, and age and condition, which tend to change the partial slopes with age. The four species were distinctly different in most of their relationships.

Decrease in Mercury Content of Fishes in Ball Lake, Ontario, Since Imposition of Controls on Mercury Discharges

1979 ◽  
Vol 36 (6) ◽  
pp. 670-672 ◽  
Author(s):  
F. A. J. Armstrong ◽  
D. P. Scott
Keyword(s):  
Key Words ◽  
White Muscle ◽  
Fork Length ◽  
Lake Ontario ◽  
Northern Pike ◽  
Mercury Content ◽  
Mercury Contamination ◽  
Coregonus Clupeaformis ◽  
Northwestern Ontario ◽  
Key Words Mercury

Weight, fork length, and white muscle mercury concentrations of walleye (Stizostedion vitreum vitreum), northern pike (Esox lucius), and lake whitefish (Coregonus clupeaformis) from Ball Lake, northwestern Ontario, were compared for 1971, 1972, and 1976. The lake had received mercury from 1962 to 1970; since then there have been increasingly rigorous controls. Adjusted mean white muscle mercury concentrations for walleye at the group mean length of 444 mm were 1.99, 2.71, and 1.39 mg/kg, respectively, for the three sample years. Corresponding values for pike 594 mm long were 5.05, 5.72, and 1.80 mg/kg. Whitefish values for 1972 and 1976 were 0.62 and 0.42 at 441 mm fork length. The changes are discussed in relation to the decreased input of mercury to the lake and it is suggested that mercury in suspension may be a controlling factor. Key words: mercury contamination, walleye, pike, whitefish, Ball Lake

scholarly journals Quenching of hexafluoroacetone phosphorescence by mercury

1968 ◽  
Vol 46 (6) ◽  
pp. 1031-1033 ◽  
Author(s):  
N. C. Lang ◽  
K. O. Kutschke
Keyword(s):  
Triplet State ◽  
Linear Function ◽  
Excellent Agreement ◽  
Mercury Concentration ◽  
Relative Yield ◽  
Lifetime Measurements ◽  
First Order

The ratio of the relative yield for fluorescence to that for phosphorescence of hexafluoroacetone excited at 3130 Å was measured; the ratio was a linear function of mercury concentration. This observation confirms that the deactivation of the triplet state proceeds by a reaction which is first order in [Hg]. A quenching constant was obtained which is in excellent agreement with that based on lifetime measurements under mercury-free and mercury-saturated conditions.

Age and Growth of Alewives in the Changing Pelagia of Lake Ontario, 1978–1992

1997 ◽  
Vol 126 (1) ◽  
pp. 112-126 ◽  
Author(s):  
Robert O'Gorman ◽  
Ora E. Johannsson ◽  
Clifford P. Schneider
Keyword(s):  
Lake Ontario ◽  
Age And Growth

Suitability of Vertical Slot and Denil Fishways for Passing North-Temperate, Nonsalmonid Fish

1985 ◽  
Vol 42 (11) ◽  
pp. 1815-1822 ◽  
Author(s):  
Karl Schwalme ◽  
William C. Mackay ◽  
Dieter Lindner
Keyword(s):  
Yellow Perch ◽  
Perca Flavescens ◽  
High Water ◽  
Water Levels ◽  
Coregonus Clupeaformis ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Vertical Slot ◽  
Vertical Slot Fishway ◽  
Longnose Sucker

A vertical slot fishway and two Denil fishways (of 10 and 20% slope) built into a weir on the Lesser Slave River (55°18′N, 115°45′W) were studied from May 12 to June 25, 1984, to determine how effectively these designs pass north-temperate, nonsalmonid fishes. Thousands of spottail shiner (Notropis hudsonius), substantial numbers (> 100) of northern pike (Esox lucius), longnose sucker (Catostomus catostomus), white sucker (Catostomus commersoni), immature yellow perch (Perca flavescens), and lesser numbers of burbot (Lota lota), adult yellow perch, lake whitefish (Coregonus clupeaformis), and trout-perch (Percopsis omiscomaycus) ascended the fishways. Walleye (Stizostedion vitreum) and goldeye (Hiodon alosoides), although probably moving extensively through the river, did not use the fishways. Although high water levels allowed most fish to surmount the weir, of those that chose the fishway, pike strongly preferred to ascend the Denil fishways and the two sucker species preferred to ascend the vertical slot. Therefore, a combination of several different fishways may be required for the most efficient passage of a wide variety of species. Plasma glucose and lactate measurements on pike revealed that ascending the Denil fishways was only moderately stressful for these fish.

Distribution and transformation of elemental mercury in the St. Lawrence River and Lake Ontario

2000 ◽  
Vol 57 (S1) ◽  
pp. 155-163 ◽  
Author(s):  
Marc Amyot ◽  
David RS Lean ◽  
Laurier Poissant ◽  
Marie-Renée Doyon
Keyword(s):  
Water Column ◽  
Laboratory Experiments ◽  
Lake Ontario ◽  
Elemental Mercury ◽  
Volatile Species ◽  
Spatial And Temporal Patterns ◽  
First Order ◽  
Inland Lakes ◽  
First Order Kinetics ◽  
St Lawrence River

Elemental Hg (Hg0) is a volatile species that is responsible for water-to-air transfer of Hg in Lake Ontario and the St. Lawrence River. We conducted two cruises in 1998 to identify spatial and temporal patterns in Hg0 levels in these systems and performed field and laboratory experiments on redox transformations of Hg. Elemental Hg concentrations were higher in Lake Ontario than in the St. Lawrence River. At stations in Lake Ontario, Hg0 levels were higher at the bottom of the water column than at the surface, whereas they were homogeneous throughout the water column of the river. Elemental Hg concentrations were generally higher in July than in September and, in contrast with experiments on inland lakes, were relatively constant during the day except for a narrow peak at sunrise. Field and laboratory experiments showed that photoreduction of Hg(II) in St. Lawrence River water was substrate limited and was influenced by visible and ultraviolet radiation. Pseudo first-order kinetics best described photoreduction, with k values between 1 and 2·h-1.

The Distribution of Mercury in the Sediments of Lake Ontario

1972 ◽  
Vol 9 (6) ◽  
pp. 636-651 ◽  
Author(s):  
R. L. Thomas
Keyword(s):  
Mercury Concentration ◽  
Lake Ontario ◽  
Average Concentration ◽  
Sediment Type ◽  
Lake Basin ◽  
Niagara River ◽  
Fine Sediments ◽  
High Mercury ◽  
Main Lake ◽  
Recent Sediments

Total mercury has been analysed in the surface 3 cm of sediment taken from 287 sample stations on an 8 km grid on Lake Ontario during 1968. The mercury distribution shows well-defined trends which can be related to sediment type; the concentration of mercury increasing from the shallow nearshore coarse sediments outwards, into the central, deep-water basin sediments composed of fine silty clays and clays. The average concentration of mercury in the nearshore sediments is 355 ppb, in the basin sediments 997 ppb and the average for the whole lake is 651 ppb. Regions of high mercury concentration (in the order of 2000 ppb) occur along the southern margin of the main lake basin and in the western (Niagara) basin of the lake. The dispersion pathways of these two regions point to the Niagara River as the prime source of mercury input to Lake Ontario. Most of this mercury is believed to be of industrial origin. An additional area of high mercury concentration with values up to 20 000 ppb, occurs at the eastern end of Lake Ontario (Kingston Basin) in the region of the lake close to the outlet to the St. Lawrence River. These high values in organic-rich, fine sediments are likely related to processes of biological concentration. The concentrations of mercury observed in the recent sediments of Lake Ontario can be accounted for by an average minimum daily input of 125 lb (56.7 kg) of mercury of which an estimated 42 lb (19.0 kg) is of natural origin and the remaining 83 lb (37.6 kg) is from industrial sources. The vertical distribution of mercury in a selected sediment core suggests that industrial mercury input commenced about the turn of the century, rose rapidly to circa 1943 and, since then, has shown a slow but continued rise to the time of core retrieval in 1970.

Species differences in total mercury concentration in gulls from the Gulf of Gdansk (Southern Baltic)

2016 ◽  
Vol 33 ◽  
pp. 100-109 ◽  
Author(s):  
Emilia Szumiło-Pilarska ◽  
Agnieszka Grajewska ◽  
Lucyna Falkowska ◽  
Julia Hajdrych ◽  
Włodzimierz Meissner ◽  
...  
Keyword(s):  
Mercury Concentration ◽  
Total Mercury ◽  
Species Differences ◽  
Gulf Of Gdańsk ◽  
Total Mercury Concentration ◽  
Gulf Of Gdansk ◽  
Southern Baltic

Determination of Age and Growth of Populations of the White Sucker (Catostomus commersoni) Exhibiting a Wide Range in Size at Maturity

1973 ◽  
Vol 30 (5) ◽  
pp. 607-616 ◽  
Author(s):  
Richard J. Beamish
Keyword(s):  
Age And Growth ◽  
Size At Maturity ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Pectoral Fins ◽  
Scale Method ◽  
Fin Ray ◽  
Wide Range ◽  
Size At Sexual Maturity

The use of the scale method to determine age of mature white suckers should be avoided. Sections of pectoral fin rays can provide accurate age determinations for most populations once the position of the first annulus has been identified. The age of immature white suckers can be estimated by both methods. It is suggested that, for identification of the first fin ray annulus and facility in the determination of the age of immature white suckers, both pectoral fins and scales should be sampled in all age and growth studies of this species.White suckers (Catostomus commersoni) from populations examined in this study attained ages of up to 17 years although little or no growth occurred in the latter years. Considerable variation in size at sexual maturity was found throughout the range for this species and, thus, the validity of a subspecies designation for a dwarf white sucker (C. c. utawana) based primarily on size differences should be reexamined.

Postmortem Glycolytic and Other Biochemical Changes in White Muscle of White Sucker (Catostomus commersoni) and Northern Pike (Esox lucius) at 0 C

1970 ◽  
Vol 27 (11) ◽  
pp. 1997-2002 ◽  
Author(s):  
S. V. Manohar
Keyword(s):  
Muscle Glycogen ◽  
White Muscle ◽  
Glycogen Content ◽  
Northern Pike ◽  
Esox Lucius ◽  
Biochemical Changes ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Anterior Portion ◽  
Posterior Portion

Postmortem biochemical changes in the white muscle of white sucker and of northern pike were, in general, similar to those observed in other species as reported previously by other investigators. However, glycogen content of pike was found to remain relatively high even after 7 days of storage in ice. This is in contrast to the findings with several other species, including white sucker, where the muscle glycogen is practically completely degraded in 3–4 days. Higher glycogen content in the posterior portion of pike muscle as compared with that in the anterior portion may partly explain the apparent high glycogen content in the muscle of this fish after several days of storage.

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