Evidence of chronic stress in winter flounder, Pleuronectes (= Pseudopleuronectes) americanus living adjacent to a pulp and paper mill in St. George's Bay, Western Newfoundland
Thesis (M.Sc.)--Memorial University of Newfoundland, 1993. Biology Bibliography: leaves 92-100. Winter flounder, Pleuronectes (= Pseudopleuronectes) americanus, living adjacent to a pulp and paper mill at Port Harmon, Stephenville, Newfoundland, were compared with flounder from a reference site, St....
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ftmemorialunivdc:oai:collections.mun.ca:theses2/96896 2023-05-15T17:23:30+02:00 Evidence of chronic stress in winter flounder, Pleuronectes (= Pseudopleuronectes) americanus living adjacent to a pulp and paper mill in St. George's Bay, Western Newfoundland Barker, Duane Edward Memorial University of Newfoundland. Dept. of Biology. Canada--Newfoundland and Labrador--Port Harmon 1993 xi, 101 leaves : ill., map. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses2/id/96896 Eng eng Electronic Theses and Dissertations (12.95 MB) -- http://collections.mun.ca/PDFs/theses/Barker_DuaneEdward.pdf 76165930 http://collections.mun.ca/cdm/ref/collection/theses2/id/96896 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Winter flounder--Effect of stress on Winter flounder--Effect of water pollution on Wood-pulp industry--Newfoundland and Labrador--Port Harmon--Environmental aspects Text Electronic thesis or dissertation 1993 ftmemorialunivdc 2015-08-06T19:16:43Z Thesis (M.Sc.)--Memorial University of Newfoundland, 1993. Biology Bibliography: leaves 92-100. Winter flounder, Pleuronectes (= Pseudopleuronectes) americanus, living adjacent to a pulp and paper mill at Port Harmon, Stephenville, Newfoundland, were compared with flounder from a reference site, St. George's, 12 km from the mill, for signs of chronic stress. Several bioindicators of stress in fish were employed, including condition factor, organ somatic indices, haematological values, external lesions, and parasitofauna. Winter flounder from Port Harmon, (effluent site) showed significantly lower condition factors (K-factors) and hepatosomatic indices (HSI) indicative of depleted energy reserves, and physiological impairment, than those from St. George's. Delayed spawning was evident in both male and female winter flounder from Port Harmon compared with those from St. George's. Blood haemoglobin, haematocrit, and lymphocyte levels were significantly lower at Port Harmon, than in samples from St. George's. Fin necrosis of the caudal, dorsal and anal fins, was greater (in terms of prevalence and intensity) in flounder from Port Harmon. The prevalence and intensity of intestinal nematodes was significantly higher at Port Harmon, than St. George's; possibly the result of differences in diet. Conversely, the prevalence and intensity of intestinal acanthocephalans was significantly lower at Port Harmon, and was possibly related to effluent discharge. No differences were found in a comparison of prevalence and intensity of intestinal digeneans. The prevalence and severity of infection of a parasitic microsporan protozoan, Glugea stephani, and the encysted metacercaria of the digenean, Cryptocotyle lingua, were, however, significantly higher among flounder from Port Harmon. Anaemia, low lymphocyte levels, a high prevalence of fin necrosis and parasitemias (Glugea stephani, Cryptocotyle lingua) are all suggestive of immunosuppression. Since the above differences were not attributed to differences in basic water parameters (temperature, salinity, conductivity, pH, and dissolved oxygen) at the two sites, the chronic stress evident in winter flounder from Port Harmon is most likely attributed to pulp mill effluent discharged at Port Harmon. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Canada Newfoundland |
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Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Winter flounder--Effect of stress on Winter flounder--Effect of water pollution on Wood-pulp industry--Newfoundland and Labrador--Port Harmon--Environmental aspects |
spellingShingle |
Winter flounder--Effect of stress on Winter flounder--Effect of water pollution on Wood-pulp industry--Newfoundland and Labrador--Port Harmon--Environmental aspects Barker, Duane Edward Evidence of chronic stress in winter flounder, Pleuronectes (= Pseudopleuronectes) americanus living adjacent to a pulp and paper mill in St. George's Bay, Western Newfoundland |
topic_facet |
Winter flounder--Effect of stress on Winter flounder--Effect of water pollution on Wood-pulp industry--Newfoundland and Labrador--Port Harmon--Environmental aspects |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 1993. Biology Bibliography: leaves 92-100. Winter flounder, Pleuronectes (= Pseudopleuronectes) americanus, living adjacent to a pulp and paper mill at Port Harmon, Stephenville, Newfoundland, were compared with flounder from a reference site, St. George's, 12 km from the mill, for signs of chronic stress. Several bioindicators of stress in fish were employed, including condition factor, organ somatic indices, haematological values, external lesions, and parasitofauna. Winter flounder from Port Harmon, (effluent site) showed significantly lower condition factors (K-factors) and hepatosomatic indices (HSI) indicative of depleted energy reserves, and physiological impairment, than those from St. George's. Delayed spawning was evident in both male and female winter flounder from Port Harmon compared with those from St. George's. Blood haemoglobin, haematocrit, and lymphocyte levels were significantly lower at Port Harmon, than in samples from St. George's. Fin necrosis of the caudal, dorsal and anal fins, was greater (in terms of prevalence and intensity) in flounder from Port Harmon. The prevalence and intensity of intestinal nematodes was significantly higher at Port Harmon, than St. George's; possibly the result of differences in diet. Conversely, the prevalence and intensity of intestinal acanthocephalans was significantly lower at Port Harmon, and was possibly related to effluent discharge. No differences were found in a comparison of prevalence and intensity of intestinal digeneans. The prevalence and severity of infection of a parasitic microsporan protozoan, Glugea stephani, and the encysted metacercaria of the digenean, Cryptocotyle lingua, were, however, significantly higher among flounder from Port Harmon. Anaemia, low lymphocyte levels, a high prevalence of fin necrosis and parasitemias (Glugea stephani, Cryptocotyle lingua) are all suggestive of immunosuppression. Since the above differences were not attributed to differences in basic water parameters (temperature, salinity, conductivity, pH, and dissolved oxygen) at the two sites, the chronic stress evident in winter flounder from Port Harmon is most likely attributed to pulp mill effluent discharged at Port Harmon. |
author2 |
Memorial University of Newfoundland. Dept. of Biology. |
format |
Thesis |
author |
Barker, Duane Edward |
author_facet |
Barker, Duane Edward |
author_sort |
Barker, Duane Edward |
title |
Evidence of chronic stress in winter flounder, Pleuronectes (= Pseudopleuronectes) americanus living adjacent to a pulp and paper mill in St. George's Bay, Western Newfoundland |
title_short |
Evidence of chronic stress in winter flounder, Pleuronectes (= Pseudopleuronectes) americanus living adjacent to a pulp and paper mill in St. George's Bay, Western Newfoundland |
title_full |
Evidence of chronic stress in winter flounder, Pleuronectes (= Pseudopleuronectes) americanus living adjacent to a pulp and paper mill in St. George's Bay, Western Newfoundland |
title_fullStr |
Evidence of chronic stress in winter flounder, Pleuronectes (= Pseudopleuronectes) americanus living adjacent to a pulp and paper mill in St. George's Bay, Western Newfoundland |
title_full_unstemmed |
Evidence of chronic stress in winter flounder, Pleuronectes (= Pseudopleuronectes) americanus living adjacent to a pulp and paper mill in St. George's Bay, Western Newfoundland |
title_sort |
evidence of chronic stress in winter flounder, pleuronectes (= pseudopleuronectes) americanus living adjacent to a pulp and paper mill in st. george's bay, western newfoundland |
publishDate |
1993 |
url |
http://collections.mun.ca/cdm/ref/collection/theses2/id/96896 |
op_coverage |
Canada--Newfoundland and Labrador--Port Harmon |
geographic |
Canada Newfoundland |
geographic_facet |
Canada Newfoundland |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (12.95 MB) -- http://collections.mun.ca/PDFs/theses/Barker_DuaneEdward.pdf 76165930 http://collections.mun.ca/cdm/ref/collection/theses2/id/96896 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766112866641903616 |