000			03513nam a2200325 a 4500
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005			20240321142102.0
008			160620s19uu xx 00 eng d
040			_cCvSU Main Campus Library
041	0		_aeng
082	0	4	_a639 _bY1 2003
100		0	_aYap, Leni G. _99184 _eauthor
245	1	4	_aThe community composition and production of phytoplankton in fish pens of Cape Bolinao, Pangasinan / _cby Leni G. Yap.
260	0		_aDiliman, Quezon City : _bUniversity of the Philippines, _c2003.
300			_axiv, 66 pages : _billustrations ; _c28 cm.
336			_2rdacontent _atext
337			_2rdamedia _aunmediated
338			_2rdacarrier _avolume
500			_aThesis (MS Marine Science-Marine Biology) University of the Philippines
504			_aIncludes bibliographical references.
520	3		_a 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.
541			_cSubmitted to the University Library _d5/27/2016 _eT-5946 _nc1
541			_cSubmitted to the University Library _d5/27/2016 _eT-5969 _nc2
650		0	_aFish culture _95956
650		0	_aPhytoplankton _xComposition _99185
650		0	_aPhytoplankton _xProductivity _99185
690			_aMaster of Science in Marine Science _xMarine Biology _96035
856			_uhttp://library.cvsu.edu.ph/cgi-bin/koha/opac-retrieve-file.pl?id=a19cf38dadcf813b88de332124ff29ae _yClick here to view thesis abstract and table of contents
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