02 SEAFDEC/AQD Collaborative Publications: Recent submissions
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Series: Summary of Proceedings No. 1/2013;
Abundance and distribution of the green alga Botryococcus braunii Kützing (1849) in Paoay Lake, Ilocos Norte
(PCAARRD-DOST, 2013)Botryococcus braunii, a green colonial freshwater microalga that is currently found in Paoay Lake, Ilocos Norte, is recognized as a renewable source of energy. The monthly abundance and distribution of B. braunii in the lake in relation to the different physico-chemical parameters and other phytoplankton species were done from April 2009 to March 2010. Throughout the period of study, analysis of samples showed that B. braunii populations were present in all samples collected in the four sampling sites. Changes in cell density were noticeable, especially during the months of April and August. The highest recorded mean density was in August (2515 cells /mL) while the lowest mean density was in May (83 cells/mL). There were 38 genera of phytoplankton that co-existed with B. braunii in the lake. Physico-chemical parameters and nutrients were still within the range for growth of the alga. Fluctuations of these nutrients may be caused by seasonal variation and the occurrence of typhoons in the region. Growth of B. braunii population is positively correlated with temperature, conductivity and phytoplankton count while it is negatively correlated with DO, pH, transparency depth, NO3-, and PO43. Although B. braunii populations were present within the water column throughout the sampling period, the present environmental conditions did not allow the formation of blooms of this algal species. -
Series: Summary of Proceedings No. 1/2013;
Lake Danao, San Francisco, Cebu as cleanest and greenest lake: Its development, problems and prospects
(PCAARRD-DOST, 2013)Lake Danao of San Francisco, Cebu was judged as one of the cleanest and greenest lakes of the Philippines under the Gawad ng Pangulo sa Kapaligiran Lake Category. The said recognition was awarded to Lake Danao because Lake Danao, as nature s gifts to the inhabitants of San Francisco, was cared for by the people as a sign of their love of nature. Aside from this, the development, problems encountered, and the plans of the Local Government for Lake Danao, were taken into consideration. Interview guide administered to the different agencies of the government in Pacijan Island, LGU officials and the fisherfolk, and actual field visits to the lake were used to gather data. Results show that the Lake Danao met the criteria for the national lake contest for its clean water and its environment and with abundant growth of plants around it. It is free from wastes and pollutants. Washing and bathing are now prohibited in the lake and no motorboats are allowed, only the paddle boats. Two parks were established in the lake namely, the Green Lake Park and the Lake Danao Park, and an eco trail was constructed around the lake for additional attraction. Results further show that aside from the local tourists visiting Lake Danao, foreigners from Canada, Germany, Hongkong, Indonesia, Italy, South Korea, Malaysia, Saudi Arabia, Switzerland, Taiwan, United Kingdom, USA, and our own 'balikbayan' also visited the lake. Problems encountered were lack of personnel s training to manage the lake, people s negative reactions to the different lake regulations and ordinances, and lack of funds. The LGU, BFAR, DA, DENR, Cebu Technological University, and other agencies collaborated to make and implement plans for the preservation of the Lake Danao. -
Series: Summary of Proceedings No. 1/2013;
ECONSERVE: Using healthy environment training to leverage the human potential of rural out of school youth to mobilize the lakeshore community for Naujan Lake biodiversity conservation
(PCAARRD-DOST, 2013) -
Series: Summary of Proceedings No. 1/2013;
Fishery resources assessment in Caluangan Lake, Calapan, Mindoro
(PCAARRD-DOST, 2013)Lake Caluangan is a saline type of lake ecosystem. It provides fishery resources, numerous goods and services for residents in the area. The study aimed to assess Lake Caluangan ecosystem in terms of fishery resources and physico-chemical parameters. Specifically, it aimed to identify taxonomically the present fish species; (b) determine the catch per unit effort expressed as biomass/hr; (c) assess the physico-chemical parameters of lakes and relate the occurrence of fishes and (d) determine the social issues and activities that possibly affect the lake ecosystem. Five and three sampling stations were established in littoral and limnetic zones, respectively. Physico-chemical parameters were measured with three replicates per station. Fish sampling was conducted using different fishing gears. Cast net was used in the littoral zone, whereas various fishing gears such as hook and line, gill nets and lift nets were used in the limnetic zone. Fish were identified using fish keys/guides and FISHBASE. Social issues and activities were determined through interviews and ocular observations. A total of 18 fish species were collected in both zones. Six fish species were caught in the littoral zone, comprised of Scorpaenidae and Tetraodontidae families, Photopectoralis sp., Scolopsis sp., Gerres sp., and Mugil cephalus. On the other hand, nine species were caught in lift nets. These species were Sertola sp., Caranx sp., Mugil cephalus, Stolephorus sp., Apogon sp., Photopectoralis sp., Upeneus sp., Gerres sp., and Siganus sp. Moreover, Dussumieria sp., Glossogobius sp., Sphyraena sp., Terapon jarbua, Monodactylus sp., and Chanos chanos, were caught using hook and line and gill nets. Siganus sp. had the highest CPUE with a value of 1,421. 21 g/hr. This species has the highest commercial value among the fish species caught in the limnetic zone, followed by Caranx sp. and Apogon sp., which were observed in both littoral and limnetic zones. Results showed that physico-chemical parameters were suitable for fishery production. The present water quality condition and presence of fishery resources were indications that the lake has a great potential to accommodate migratory species. The results can be a basis for any management interventions to the lake and for future references. -
Series: Summary of Proceedings No. 1/2013;
Establishment of fish reserve area in Taal Lake, Philippines
(PCAARRD-DOST, 2013)In 2007, The Protected Area Management Board (PAMB) of the Department of Environment and Natural Resources (DENR) approved a Unified Rules and Regulations (URR) for fisheries in the Taal Volcano Protected Landscape (TVPL). One of the provisions in the URR was the establishment of a fish reserve area which was also adopted in the newly approved TVPL Management Plan in 2009. The reserve area was about 1,000 hectares in the southern lakeside of volcano island under the municipalities of Balete, Matas na Kahoy, Sta. Teresita, and Cuenca. The boundaries were established by the Provincial Government of Batangas using a Global Positioning Satellite (GPS) and exact coordinates were identified. This study was conducted to gather baseline information on the biological, physical and chemical characteristics of water and the presence of fish larvae and fish early life in five sampling stations in the reserve area. The study was conducted for 4 months in 2010 (March, May, August, and September). Survey on fish larvae, egg and plankton were conducted using vertical and horizontal plankton towing. Physico-chemical parameters of water such as temperature, water depth, transparency, dissolved oxygen, pH, nitrites, and alkalinity were measured using a thermometer, echo sounder, secchi disk, and Lamotte test kit for freshwater, respectively. Preliminary results showed that there were fish larvae present in all stations except in Station 3, while all stations have the presence of fish eggs. There were three families of fish larvae identified which include Atherinidae, Blennidae and Syngnathidae. A total of 16 species of phytoplankton and 14 species of zooplankton were identified in all stations. The water depth ranged from 3.2 m. to more than 75 m. Station 1 was the deepest while Station 5 was the shallowest where abundant macrophytes were also observed. Water transparency in all stations ranged from 2.1 to 2.7 m. The temperature ranged from 30.5 to 32°C. Dissolved oxygen ranged from 5 to 7.1 ppm while the pH ranged from 4.0 to 9.0. Nitrites ranged from 0 to 0.1 ppm while alkalinity ranged from 185 to 220 ppm. High temperature and low pH readings were observed in May before PHIVOLCS announced Alert Level 2 in June 2010. Fishing operations of gill net, beach seine, ring net, and spear gun were also observed in the area.
