The community composition and production of phytoplankton in fish pens of Cape Bolinao, Pangasinan / by Leni G. Yap.

By: Material type: TextTextLanguage: English Publication details: Diliman, Quezon City : University of the Philippines, 2003.Description: xiv, 66 pages : illustrations ; 28 cmContent type:
  • text
Media type:
  • unmediated
Carrier type:
  • volume
Subject(s): DDC classification:
  • 639 Y1 2003
Online resources: Abstract: The last five years saw the proliferation of fish pens in Cape Bolinao, Pangasinan, NW Philippines to about 1,170 pens and cages in approximately 5-6 km7in area in 2000. Ranges of 3-16 sacks of feeds per day have been used per pen that measures 5 x 6m7. In recent years, fish kills and phytoplankton blooms have occurred in the area. This study wanted to ascertain if fish pens alter phytoplankton community composition and production in coastal Bolinao. Previous collections of phytoplankton samples from sites outside the fish pens during 1998-2000 were analyzed. During the wet, dry, and transition period of 2001, phytoplankton samples were taken from inside and outside of the pens and in the control station devoid of pens daily for seven days. A microcosm experiment was also done with 14 carbouys (13L capacity transparent plastic containers) suspended in the water column inside and outside the fish pens and in the control station for 7 days. Carbouys inside the pens were enriched with feed following the same kind and proportion of feed received by a fish pen in a day. The other carbouys had no feed added. Sampling strategy for the microcosms was the same as the field experiment. Chlorophyll-a and other physico-chemical parameters were measured. The 1998-2000 samples were diatom dominated. During the 2001 wet season, the dinoflagellate Ceratium furca were found to be dominant and high counts of 10* cells/L were recorded. In the transition period, the dinoflagellates Protoperidinium spThe diatoms Cylindrotheca closterium (Nitzchia closterium) and Leptocylindricus sp. were the most abundant. In the 2001 dry season, the diatom Cylindrotheca closterium reached 10° cells/L when dissolved oxygen was 0.70-2.30 mg/L and there were sightings of isolated fish kills. The diatoms (10° cells/L) and more so the cyanobacteria (10° -10° cells/L) bloomed inside the feed enriched microcosms. There is a possibility that Bolinao waters could experience blooms of cyanobacteria similar to those found in the microcosms. This could occur in extreme cases where water flushing becomes almost nil for at least 4-7 days.
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Item type Current library Collection Call number Materials specified URL Copy number Status Notes Date due Barcode
Theses / Manuscripts Theses / Manuscripts Ladislao N. Diwa Memorial Library Theses Section Non-fiction 639 Y1 2003 (Browse shelf(Opens below)) c1 Room use only T-5946 00000042
Theses / Manuscripts Theses / Manuscripts Ladislao N. Diwa Memorial Library Theses Section Non-fiction 639 Y1 2003 (Browse shelf(Opens below)) Link to resource c2 Room use only T-5969 00000043

Thesis (MS Marine Science-Marine Biology) University of the Philippines

Includes bibliographical references.


The last five years saw the proliferation of fish pens in Cape Bolinao, Pangasinan, NW Philippines to about 1,170 pens and cages in approximately 5-6 km7in area in 2000. Ranges of 3-16 sacks of feeds per day have been used per pen that measures 5 x 6m7. In recent years, fish kills and phytoplankton blooms have occurred in the area.

This study wanted to ascertain if fish pens alter phytoplankton community composition and production in coastal Bolinao.

Previous collections of phytoplankton samples from sites outside the fish pens during 1998-2000 were analyzed. During the wet, dry, and transition period of 2001, phytoplankton samples were taken from inside and outside of the pens and in the control station devoid of pens daily for seven days. A microcosm experiment was also done with 14 carbouys (13L capacity transparent plastic containers) suspended in the water column inside and outside the fish pens and in the control station for 7 days. Carbouys inside the pens were enriched with feed following the same kind and proportion of feed received by a fish pen in a day. The other carbouys had no feed added. Sampling strategy for the microcosms was the same as the field experiment. Chlorophyll-a and other physico-chemical parameters were measured.

The 1998-2000 samples were diatom dominated. During the 2001 wet season, the dinoflagellate Ceratium furca were found to be dominant and high counts of 10* cells/L were recorded. In the transition period, the dinoflagellates Protoperidinium spThe diatoms Cylindrotheca closterium (Nitzchia closterium) and Leptocylindricus sp. were the most abundant. In the 2001 dry season, the diatom Cylindrotheca closterium reached 10° cells/L when dissolved oxygen was 0.70-2.30 mg/L and there were sightings of isolated fish kills.

The diatoms (10° cells/L) and more so the cyanobacteria (10° -10° cells/L) bloomed inside the feed enriched microcosms. There is a possibility that Bolinao waters could experience blooms of cyanobacteria similar to those found in the microcosms. This could occur in extreme cases where water flushing becomes almost nil for at least 4-7 days.

Submitted to the University Library 5/27/2016 T-5946 c1

Submitted to the University Library 5/27/2016 T-5969 c2

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