The effects of shellfish aquaculture on chlorophyll-a in the north east Pacific Ocean
Food production systems need to keep pace with the rising global population. Food from aquatic environments comes from both capture fisheries and aquaculture. Industrial fishing pressure has caused a global loss of more than 90% of large predatory fishes and 80% of the world’s fish stocks are report...
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ftuvicpubl:oai:dspace.library.uvic.ca:1828/3274 2023-05-15T15:59:04+02:00 The effects of shellfish aquaculture on chlorophyll-a in the north east Pacific Ocean Ford, Helen Volpe, John 2011 application/pdf http://hdl.handle.net/1828/3274 English en eng http://hdl.handle.net/1828/3274 Available to the World Wide Web Aquaculture Fluorescence Chlorophyll-a Pacific oyster Thesis 2011 ftuvicpubl 2022-05-19T06:11:36Z Food production systems need to keep pace with the rising global population. Food from aquatic environments comes from both capture fisheries and aquaculture. Industrial fishing pressure has caused a global loss of more than 90% of large predatory fishes and 80% of the world’s fish stocks are reported as fully exploited or overexploited. Global finfish, shellfish and aquatic plant aquaculture has been steadily increasing to meet the global demand for seafood. In British Columbia, aquaculture is primarily marine, with salmon and shellfish accounting for the majority of species cultured. Although shellfish aquaculture accounts for significantly less production and value compared to salmon aquaculture, the amount of foreshore dedicated to farming shellfish is nearly half (44%) the total area utilized by all aquaculture in the Province. Introduced Pacific oysters (Crassostrea gigas) (74%) dominate shellfish aquaculture in British Columbia. Pacific oysters are known to be very efficient generalist filter feeders that can grow faster and larger than native species. Extensive aquaculture is a form of aquaculture, where farmed animals feed exclusively on naturally occurring food in the surrounding water column. The goal of this research was to determine if there was a measureable depletion of phytoplankton around shellfish farms along the west coast of Canada and the United States. Chlorophyll-a, a pigment found within phytoplankton, was used as a proxy for phytoplankton abundance for this study. In field season one, two bays were studied, one exposed to shellfish culture (Westcott Bay) and one not exposed to shellfish culture (Fisherman Bay). The concentration of chlorophyll-a was measured in each bay at three locations at two depths (0.5 and 3 meters) and at two tidal heights (high and low). Chlorophyll-a concentration was found to be related to either depth or tide, with location in a bay showing no difference in either of the bays studied. In addition to water column measurements, 100 Pacific oysters were placed at ... Thesis Crassostrea gigas Pacific oyster University of Victoria (Canada): UVicDSpace British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canada Pacific |
institution |
Open Polar |
collection |
University of Victoria (Canada): UVicDSpace |
op_collection_id |
ftuvicpubl |
language |
English |
topic |
Aquaculture Fluorescence Chlorophyll-a Pacific oyster |
spellingShingle |
Aquaculture Fluorescence Chlorophyll-a Pacific oyster Ford, Helen The effects of shellfish aquaculture on chlorophyll-a in the north east Pacific Ocean |
topic_facet |
Aquaculture Fluorescence Chlorophyll-a Pacific oyster |
description |
Food production systems need to keep pace with the rising global population. Food from aquatic environments comes from both capture fisheries and aquaculture. Industrial fishing pressure has caused a global loss of more than 90% of large predatory fishes and 80% of the world’s fish stocks are reported as fully exploited or overexploited. Global finfish, shellfish and aquatic plant aquaculture has been steadily increasing to meet the global demand for seafood. In British Columbia, aquaculture is primarily marine, with salmon and shellfish accounting for the majority of species cultured. Although shellfish aquaculture accounts for significantly less production and value compared to salmon aquaculture, the amount of foreshore dedicated to farming shellfish is nearly half (44%) the total area utilized by all aquaculture in the Province. Introduced Pacific oysters (Crassostrea gigas) (74%) dominate shellfish aquaculture in British Columbia. Pacific oysters are known to be very efficient generalist filter feeders that can grow faster and larger than native species. Extensive aquaculture is a form of aquaculture, where farmed animals feed exclusively on naturally occurring food in the surrounding water column. The goal of this research was to determine if there was a measureable depletion of phytoplankton around shellfish farms along the west coast of Canada and the United States. Chlorophyll-a, a pigment found within phytoplankton, was used as a proxy for phytoplankton abundance for this study. In field season one, two bays were studied, one exposed to shellfish culture (Westcott Bay) and one not exposed to shellfish culture (Fisherman Bay). The concentration of chlorophyll-a was measured in each bay at three locations at two depths (0.5 and 3 meters) and at two tidal heights (high and low). Chlorophyll-a concentration was found to be related to either depth or tide, with location in a bay showing no difference in either of the bays studied. In addition to water column measurements, 100 Pacific oysters were placed at ... |
author2 |
Volpe, John |
format |
Thesis |
author |
Ford, Helen |
author_facet |
Ford, Helen |
author_sort |
Ford, Helen |
title |
The effects of shellfish aquaculture on chlorophyll-a in the north east Pacific Ocean |
title_short |
The effects of shellfish aquaculture on chlorophyll-a in the north east Pacific Ocean |
title_full |
The effects of shellfish aquaculture on chlorophyll-a in the north east Pacific Ocean |
title_fullStr |
The effects of shellfish aquaculture on chlorophyll-a in the north east Pacific Ocean |
title_full_unstemmed |
The effects of shellfish aquaculture on chlorophyll-a in the north east Pacific Ocean |
title_sort |
effects of shellfish aquaculture on chlorophyll-a in the north east pacific ocean |
publishDate |
2011 |
url |
http://hdl.handle.net/1828/3274 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
British Columbia Canada Pacific |
geographic_facet |
British Columbia Canada Pacific |
genre |
Crassostrea gigas Pacific oyster |
genre_facet |
Crassostrea gigas Pacific oyster |
op_relation |
http://hdl.handle.net/1828/3274 |
op_rights |
Available to the World Wide Web |
_version_ |
1766394842879885312 |