Proceedings - Teaching and Learning Centre - Simon Fraser ...
Proceedings - Teaching and Learning Centre - Simon Fraser ... Proceedings - Teaching and Learning Centre - Simon Fraser ...
Fraser River Action Plan 3rd Research Workshop Survey of Toxaphene in Burbot from Four Fraser Basin Lakes C. Gray Environment Canada This survey was initiated after elevated levels of toxaphene were reported in fish sampled from selected lakes in the southern Yukon and the Banff/Jasper region. Because the source of toxaphene, in most cases, was long-range atmospheric transport, it seemed logical that similar levels of toxaphene would be found in fish from the Fraser basin. As the Yukon-based study found highest levels in burbot liver tissue, this species was chosen for the survey. In spring of 1995, five adult burbot were collected from Moose, Stuart, Kamloops and Nicola lakes. These fish were shipped frozen to the lab for determination of sex, age and the presence of tumors before removing the liver for analyses of PCBs, organochlorine pesticides and toxaphene. Only a preliminary evaluation of the toxaphene data will be available for this workshop. Toxaphene analyses were reported in three ways: 1. total toxaphene; 2. total Hexa-, Hepta-, Octa-, Nona-, & Deca- chlorinated homologues; and, 3. individual “Parlar” Chorobornanes. Average total toxaphene in male burbot varied by an order of magnitude: • 16 ng/g in Nicola; • 123 ng/g in Stuart; • 139 ng/g in Kamloops; and, • 610 ng/g in Moose. The most commonly detected and abundant Chlorobornane was “P4” (2-exo,3-endo,5-exo,6-endo,8,8,9,10,10- Nonachlorobornane). The Hepta- and Nona- chlorinated homologues were the most commonly detected homologues. The total toxaphene levels in burbot from Stuart, Kamloops and Nicola lakes were similar to the Yukon lakes, which displayed low biomagnification of toxaphene by fish such as burbot. The levels of toxaphene in Moose Lake. was about half that measured in Lake Laberge, which displayed a high biomagnification because its food chain length is longer than the other Yukon lakes in the study. Measuring stable nitrogen isotope ratios in our burbot samples to determine food chain position is required before the relatively high levels in Moose Lake burbot can be attributed to a long food chain or to a local source of toxaphene. Page 233
Fraser River Action Plan 3rd Research Workshop Fraser Basin Burbot Samples (Spring 1995) Lake Length Weight Sex Age (cm) (kg) (yrs) Moose 53 + 7 0.9 + 0.4 4M:1F Stuart 79 + 12 3.0 + 0.7 4M:1F Kamloops 54 + 7 1.2 + 0.3 4M:1F Nicola 52 + 4 0.9 + 0.2 4M:1F Burbot Liver Toxaphene Mean for 4 Male Fish Lake Tot. Toxaphene Chlorobornane "P4" (ng/g) (ng/g) Moose 610 + 125 115 + 17 Stuart 123 + 55 33 + 16 Kamloops 139 + 50 32 + 5 Nicola 16 + 17 3 + 2 DRAFT Page 234
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<strong>Fraser</strong> River Action Plan 3rd Research Workshop<br />
<strong>Fraser</strong> Basin Burbot Samples (Spring 1995)<br />
Lake Length Weight Sex Age<br />
(cm) (kg) (yrs)<br />
Moose 53 + 7 0.9 + 0.4 4M:1F<br />
Stuart 79 + 12 3.0 + 0.7 4M:1F<br />
Kamloops 54 + 7 1.2 + 0.3 4M:1F<br />
Nicola 52 + 4 0.9 + 0.2 4M:1F<br />
Burbot Liver Toxaphene<br />
Mean for 4 Male Fish<br />
Lake Tot. Toxaphene Chlorobornane "P4"<br />
(ng/g) (ng/g)<br />
Moose 610 + 125 115 + 17<br />
Stuart 123 + 55 33 + 16<br />
Kamloops 139 + 50 32 + 5<br />
Nicola 16 + 17 3 + 2<br />
DRAFT<br />
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