Organochlorine and mercury residues in fish from Lake Simcoe, Ontario 1970–76

Frank, R.; Holdrinet, M.; DesJardine, R. L.; Dodge, D. P.

doi:10.1007/bf00001453

Cited by 12 publications

(11 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The highest average concentration of pesticides in fish were dieldrin (24.9 ng/g), chlordane (27.8 rig/g), HCH (B -8.2 ng/g and y -3.5 ng/g), and aldrin (1.1 ng/g). The observed levels were considerably lower than those presented by FRANK et al (1978) of Lake Erie and St. Clair fish. Some of the mean residue concentrations in fish from Lake Erie were dieldrin (190 ng/g), chlordane (46 ng/g) and DDT (560 ng/g).…”

Section: Resultscontrasting

confidence: 70%

See 1 more Smart Citation

Organochlorine pesticide residues in rice paddies in Malaysia, 1981

Meier

Fook

Lagler

1983

Bull. Environ. Contam. Toxicol.

View full text Add to dashboard Cite

Rice and fish are common staple foods in many parts of Asia, Africa, and Latin America. The cultivation of fish in paddy fields has proven to be highly productive. Simultaneous rice and fish cultures can be accomplished with little extra effort and is economically feasible and practical. Fish enhance rice yield through predation of insect pests, reduce aquatic vascular plant and algal growth, and add nutrients through deposition of fecal matter (TAN et al. 1973). However, the present use of persistent and toxic pesticides in paddy fields may not only destroy the ecological relationship between rice and fish, but may even prove deleterious to the consumers. In order to assess the potential health implications to paddy farmers, this study was conducted to determine the indigenous concentrations of organochlorine pesticides in the paddy fish, sediment, and water. MATERIALS AND METHODS A total of 332 paddy fish was taken from five sampling locations in the Krian District, State of Perak, Malaysia, using a 6 cm square-mesh gill net, a cast net, and wire cage traps. The fish were pooled at each location with 36 at Tanjong Piandang (paddy field), 98 at Sungei Kota (paddy field), 83 at Jalan Bharu (sump pond), 59 at Parit Tanjong Piandang (irrigation/drainage canal), and 56 at Sungei Burong (irrigation/drainage canal). Each catch of fish was systematically divided into subsamples of 6, 16, 12, 8 and 8 for the respective locations. Each subsample was made up of 6 to 8 fish for a composite of 500 g. In addition, three composite samples of sediment and water were collected at each of the sampling locations. Fish were washed, eviscerated, skinned, filleted, and homogenized in a high-speed blender with sodium sulfate added (4:1 sodium sulfate to tissue). Samples of approximately i0 g (wet weight) of fish, 5 g (wet weight) of sediment, and one liter of water were treated for extraction. Individual fish and sediment samples were extracted with hexane:acetone (I00 mL each) in a Soxhlet extractor using a 24-h cycle. The water samples were extracted twice in a separatory funnel with 250 mL of hexane.

show abstract

Section: Resultscontrasting

confidence: 70%

“…Fish from Lake St. Clair had mean residue levels for dieldrin (55 ng/g), chlordane (8 ng/g) and DDT 190 ng/g). It should be pointed out that a comparison between the U.S. survey (FRANK et al 1978) and this study may not be valid due to the differences in species composition, age and fat content.…”

Section: Resultsmentioning

confidence: 81%

Organochlorine pesticide residues in rice paddies in Malaysia, 1981

Meier

Fook

Lagler

1983

Bull. Environ. Contam. Toxicol.

View full text Add to dashboard Cite

show abstract

“…However, the last study which documented contaminant trends in Lake Simcoe fishes presented data only up until 1976 (Frank et al, 1978). Frank et al (1978) found that concentrations of DDT and polychlorinated biphenyls (PCBs) generally declined between 1970 and 1975-1976. In contrast, for the most part, mercury did not change during this same time period (Frank et al, 1978).…”

Section: Introductionmentioning

confidence: 97%

“…Frank et al (1978) found that concentrations of DDT and polychlorinated biphenyls (PCBs) generally declined between 1970 and 1975-1976. In contrast, for the most part, mercury did not change during this same time period (Frank et al, 1978). Since the 1970s, the population in the Lake Simcoe watershed (currently~400,000) has more than doubled (Eimers et al, 2005) and is expected to increase (LSSAC, 2008).…”

Section: Introductionmentioning

confidence: 98%

“…In the Simcoe watershed, dichlorodiphenyltrichloroethane (DDT) was used intensively as a pesticide in agriculture and in mosquito control programs until restrictions were introduced in 1970, and methyl mercury was used for seed treatment until it was phased out between 1970 and 1972 (Frank et al, 1978). Sources of these and other contaminants could also include runoff from sanitary landfill sites and sewage-sludge disposal areas, urban stormwater runoff, and atmospheric deposition (OMOE, 1978).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation