Spatial and Seasonal Nutrient Trends in Manila Bay Aquaculture Farms
Sampling was done in duplicates during dry (May 2014 and February 2015) and wet season (September 2014 and November 2014) following the blocking scheme for the nutrient trends. As for the nutrient loading, water samples were collected in three ponds after flooding (water intrusion) and prior to draining (water release). Colorimetric analyses by UV-Vis Spectroscopy following the US EPA standard methods were used to determine the samples’ nutrient levels specifically, ammonia, nitrate, nitrite, and phosphorus. Results showed that ammonia had the highest levels followed by phosphorus, nitrate, and nitrite. Geographically, higher concentration of nitrogen and phosphorus were observed in Eastern Bulacan aquaculture farms, which is attributed to the farmers’ disregard of the important pond preparation activities. Varying seasonal trends were noted among nutrient species due to the different reactions of each analyte under changing climatic conditions. Nutrient levels in sediments were several folds higher than that in the water column. Results of correlation analyses of nutrients in water and sediments showed: a) a good correlation for phosphorus, b) weak correlation for ammonia, and c) no correlation for nitrites and nitrates, implying that sediments maybe a possible contributor of phosphorus and ammonia in water but not nitrite and nitrate. Ammonia and TKN were significantly higher during the flooding suggesting that water coming in to the pond already contains high levels of said nutrients possibly due to higher organic load. Conversely, nitrite and nitrate levels were significantly higher during the draining suggesting transformation of ammonia into these less toxic substances by nitrifying bacteria.
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Language: | English |
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2017
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Subjects: | Aquaculture, Chemistry, Fisheries, Oceanography, Nitrogen, Phosphorus, Manila Bay, |
Online Access: | http://hdl.handle.net/1834/41168 |
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dig-aquadocs-1834-411682021-07-24T03:27:26Z Spatial and Seasonal Nutrient Trends in Manila Bay Aquaculture Farms Opinion, April Grace R. Raña, Joan A. Perelonia, Karl Bryan S. Abendanio, Camille C. Cambia, Flordeliza D. Fisheries Post Harvest Research and Development Division, National Fisheries Research and Development Institute Aquaculture Chemistry Fisheries Oceanography Aquaculture Nitrogen Phosphorus Manila Bay Sampling was done in duplicates during dry (May 2014 and February 2015) and wet season (September 2014 and November 2014) following the blocking scheme for the nutrient trends. As for the nutrient loading, water samples were collected in three ponds after flooding (water intrusion) and prior to draining (water release). Colorimetric analyses by UV-Vis Spectroscopy following the US EPA standard methods were used to determine the samples’ nutrient levels specifically, ammonia, nitrate, nitrite, and phosphorus. Results showed that ammonia had the highest levels followed by phosphorus, nitrate, and nitrite. Geographically, higher concentration of nitrogen and phosphorus were observed in Eastern Bulacan aquaculture farms, which is attributed to the farmers’ disregard of the important pond preparation activities. Varying seasonal trends were noted among nutrient species due to the different reactions of each analyte under changing climatic conditions. Nutrient levels in sediments were several folds higher than that in the water column. Results of correlation analyses of nutrients in water and sediments showed: a) a good correlation for phosphorus, b) weak correlation for ammonia, and c) no correlation for nitrites and nitrates, implying that sediments maybe a possible contributor of phosphorus and ammonia in water but not nitrite and nitrate. Ammonia and TKN were significantly higher during the flooding suggesting that water coming in to the pond already contains high levels of said nutrients possibly due to higher organic load. Conversely, nitrite and nitrate levels were significantly higher during the draining suggesting transformation of ammonia into these less toxic substances by nitrifying bacteria. 2021-06-24T18:42:45Z 2021-06-24T18:42:45Z 2017 article TRUE 0048-377X 10.31398/tpjf/24.1.2016A0013 http://hdl.handle.net/1834/41168 en http://www.nfrdi.da.gov.ph/tpjf/index.php/ application/pdf application/pdf 39-73 http://aquaticcommons.org/id/eprint/26984 25026 2020-03-05 01:26:54 26984 National Fisheries Research and Development Institute, Philippines |
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Aquaculture Chemistry Fisheries Oceanography Aquaculture Nitrogen Phosphorus Manila Bay Aquaculture Chemistry Fisheries Oceanography Aquaculture Nitrogen Phosphorus Manila Bay |
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Aquaculture Chemistry Fisheries Oceanography Aquaculture Nitrogen Phosphorus Manila Bay Aquaculture Chemistry Fisheries Oceanography Aquaculture Nitrogen Phosphorus Manila Bay Opinion, April Grace R. Raña, Joan A. Perelonia, Karl Bryan S. Abendanio, Camille C. Cambia, Flordeliza D. Spatial and Seasonal Nutrient Trends in Manila Bay Aquaculture Farms |
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Sampling was done in duplicates during dry (May 2014 and February 2015) and wet season (September 2014 and November 2014) following the blocking scheme for the nutrient trends. As for the nutrient loading, water samples were collected in three ponds after flooding (water intrusion) and prior to draining (water release). Colorimetric analyses by UV-Vis Spectroscopy following the US EPA standard methods were used to determine the samples’ nutrient levels specifically, ammonia, nitrate, nitrite, and phosphorus. Results showed that ammonia had the highest levels followed by phosphorus, nitrate, and nitrite. Geographically, higher concentration of nitrogen and phosphorus were observed in Eastern Bulacan aquaculture farms, which is attributed to the farmers’ disregard of the important pond preparation activities. Varying seasonal trends were noted among nutrient species due to the different reactions of each analyte under changing climatic conditions. Nutrient levels in sediments were several folds higher than that in the water column. Results of correlation analyses of nutrients in water and sediments showed: a) a good correlation for phosphorus, b) weak correlation for ammonia, and c) no correlation for nitrites and nitrates, implying that sediments maybe a possible contributor of phosphorus and ammonia in water but not nitrite and nitrate. Ammonia and TKN were significantly higher during the flooding suggesting that water coming in to the pond already contains high levels of said nutrients possibly due to higher organic load. Conversely, nitrite and nitrate levels were significantly higher during the draining suggesting transformation of ammonia into these less toxic substances by nitrifying bacteria. |
author2 |
Fisheries Post Harvest Research and Development Division, National Fisheries Research and Development Institute |
author_facet |
Fisheries Post Harvest Research and Development Division, National Fisheries Research and Development Institute Opinion, April Grace R. Raña, Joan A. Perelonia, Karl Bryan S. Abendanio, Camille C. Cambia, Flordeliza D. |
format |
article |
topic_facet |
Aquaculture Chemistry Fisheries Oceanography Aquaculture Nitrogen Phosphorus Manila Bay |
author |
Opinion, April Grace R. Raña, Joan A. Perelonia, Karl Bryan S. Abendanio, Camille C. Cambia, Flordeliza D. |
author_sort |
Opinion, April Grace R. |
title |
Spatial and Seasonal Nutrient Trends in Manila Bay Aquaculture Farms |
title_short |
Spatial and Seasonal Nutrient Trends in Manila Bay Aquaculture Farms |
title_full |
Spatial and Seasonal Nutrient Trends in Manila Bay Aquaculture Farms |
title_fullStr |
Spatial and Seasonal Nutrient Trends in Manila Bay Aquaculture Farms |
title_full_unstemmed |
Spatial and Seasonal Nutrient Trends in Manila Bay Aquaculture Farms |
title_sort |
spatial and seasonal nutrient trends in manila bay aquaculture farms |
publishDate |
2017 |
url |
http://hdl.handle.net/1834/41168 |
work_keys_str_mv |
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