Perlihatkan publikasi sederhana

dc.contributor.authorAlcañices, Marilyn M.
dc.contributor.authorPagulayan, Roberto C.
dc.contributor.authorMamaril, Augustus C.
dc.date.accessioned2012-01-19T11:05:04Z
dc.date.available2012-01-19T11:05:04Z
dc.date.issued2001
dc.identifier.citationAlcañices, M. M., Pagulayan, R. C., & Mamaril, A. C. (2001). Impact assessment of cage culture in Lake Taal, Philippines ((Abstract only). In C. B. Santiago, M. L. Cuvin-Aralar, & Z. U. Basiao (Eds.), Conservation and Ecological Management of Philippine Lakes in Relation to Fisheries and Aquaculture (p.153). Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center; Los Baños, Laguna, Philippines: Philippine Council for Aquatic and Marine Research and Development (PCAMRD), Department of Science and Technology; Quezon City, Philippines: Bureau of Fisheries and Aquatic Resources (BFAR), Department of Agriculture, Quezon City, Philippines.en
dc.identifier.isbn9718511539
dc.identifier.urihttp://hdl.handle.net/10862/836
dc.descriptionAbstract only.en
dc.description.abstractThe environmental impact of cage culture on water quality of Lake Taal was assessed from March 1996 through February 1997. Three stations were considered namely: Balas, which serves as station 1 (non-cage area) and Sampaloc and Laurel, stations 2 and 3 (cage areas), respectively. Monthly water samples with two replicates were collected using a van Dorn sampler at 0, 5, 10 and 15-m depths in all stations. Below surface water from the inside of the cages was also collected. Water temperature, water transparency, pH, and conductivity were determined in situ. Dissolved oxygen, chloride, NO3, NH3, PO4, and total P were analyzed in the laboratory. Phytoplankton density and algal biomass (through cholorophyll a) and primary productivity indices were determined with the light-and-dark bottle method. Of the water quality parameters, conductivity and DO had significant differences between non-cage and cage areas. Conductivity gave significant difference (P<0.01) between control and cage area during the wet season. Highest conductivity value (2100 µ S/cm) was observed in station 3. Mean values of DO gave significant differences (P<0.05) in the different stations throughout the study period. A decrease of DO to 2.5 mg/1 was observed below 10-m depth around the cage areas. Analysis indicates that cage culture leads to oxygen depletion in the water column. The presence of cage structures decreased the flow rate resulting to weak circulation. The reduced water circulation in effect decreased the supply of oxygen and removal of toxic waste metabolites from the vicinity of the fish farm, and reduced the supply of plankton. These results suggest that the impact of cage culture in Lake Taal is minor but can alter the lake ecosystem if not properly managed. Zoning and continuous water quality monitoring are needed.en
dc.language.isoenen
dc.publisherAquaculture Department, Southeast Asian Fisheries Development Centeren
dc.publisherPhilippine Council for Aquatic and Marine Research and Development (PCAMRD), Department of Science and Technologyen
dc.publisherBureau of Fisheries and Aquatic Resourcesen
dc.subjectPhilippines, Luzon I., Batangas, Taal L.en
dc.titleImpact assessment of cage culture in Lake Taal, Philippinesen
dc.typeConference paperen
dc.citation.spage153
dc.citation.conferenceTitleConservation and Ecological Management of Philippine Lakes in Relation to Fisheries and Aquaculture: Proceedings of the National Seminar-Workshop held on October 21-23, 1997, INNOTECH, Commonwealth Ave., Diliman, Quezon City, Philippinesen
dc.subject.asfacage cultureen
dc.subject.asfaenvironmental assessmenten
dc.subject.asfaenvironmental impacten
dc.subject.asfafish cultureen
dc.subject.asfafreshwater aquacultureen
dc.subject.asfafreshwater lakesen
dc.subject.asfaoxygen depletionen
dc.subject.asfaplankton surveysen
dc.subject.asfawater propertiesen
dc.subject.asfawater qualityen
dc.subject.asfawater samplingen


Files in this item

Thumbnail

Publikasi ini ada di koleksi berikut

Perlihatkan publikasi sederhana