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Abstract
Titrimetric method or Winkler Method was applied to determine dissolved oxygen (DO) in seawaters of The Sea Pearl Cultivation Development Site, West Lombok during the South-East monsoon of June 2021. Samples were collected in three (3) locations (Gili Gede, Gili Genting and Autorei) at Sekotong waters, West Lombok, Nusa Tenggara Barat. The salinity was ranging from 31.9 – 32.3 PSU and the temperature ranged from 28.4 – 29.7oC respectively. The concentration of dissolved oxygen measured with the Winkler method was ranging from 3.4 - 5.2 mg / L. The trend of vertical oxygen concentration in the study area was declining through the depth due to the utilization by marine organisms for the process of respiration and oxidation of organic matter. We found the higher oxygen concentration (5 – 6 mg/L) was measured in the layer of depth at 20 - 25 m where sea shell pearls are developed or cultivated. The results of oxygen concentration measurement indicated that those depths (20 -25 m) are suitable for locations of seashell pearls cultivation. Dissolved oxygen becomes an important abiotic factor for ecosystems that support the sustainability of marine life and marine aquaculture development efforts.
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References
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References
Asfin, 2000. Sejarah Usaha Budidaya Mutiara di
Provinsi Nusa Tenggara Barat. https://dislutkan.ntbprov.go.id/wpcontent/uploads/2020/07/SEJARAH-USAHA-MUTIARA-DI-NTB-OK-UPLOAD.pdf
Aunurohim, F. 2013. Kajian Komposisi Fitoplankton dan Hubungannya dengan Lokasi Budidaya Kerang Mutiara (Pintada Maxima) di Perairan Sekotong, Nusa Tenggara Barat. Jurnal Teknik Pomits, 2(1) : 1 – 6.
Breitburg, D.L., Hondorp, D. W., Davias, L. A.and Diaz, R. J. 2009. Hypoxia, Nitrogen and Fisheries: Integrating Effects Across Local and Global Landscapes. Annual Reviews in Marine Sciences, 1, 329–49.
Breitburg, D., Levin, L.A., Oschilies, A.,Gregoire, M., Chave, F. P., Conley, D.J. 2018. Declining oxygen in the global ocean and coastal waters. Science, 359,eaam7240
Dinas Kelautan dan Perikanan. 2014. Laporan Tahunan. Dinas Kelautan dan perikanan
Diaz, R.J. and Rosenberg, R. 2008. Spreading Dead Zones and Consequences for Marine Ecosystems. Science, 321(5891), 926–929.
Fieux M. R, Molcard, R., &Illahude, A. G. 1996.Geostrophic transpor of the Pacific-Hindianoceans throughflow. J Geophys. Res. 101(C5):12.421-12.432.
Gilbert, D., Rabalais, N. N., Díaz, R. J., and
Zhang, J. 2010. Evidence for greater oxygen decline rates in the coastal ocean than in the open ocean, Biogeosciences, 7,2283–2296
Glibert PM, Burkholder JM. 2011. Harmful algal blooms and eutrophication:Strategies for nutrient uptake and growth outside the Redfield comfort zone.Chinease J. Oceanol. Limnol. 9:729-738.
Grasshoff, K. 1976. Methods of Seawater Analysis. Verlog Chemie Weinhem. New York.
Hutagalung, H. P., Setiapermana, D., & Riyono,S. H. 1997. MetodeAnalisis Air Laut,Sedimendan Biota. Bukukedua. Jakarta:P3O-LIPI. 75-79.
Hendrianti, A.,D.Y.N. Kurniadi, A. Heriati. 2018. Kajian Hidrodinamik Bagi Pengembangan Budidaya Laut di Sekotong, Nusa Tenggara Barat. Jurnal Teknik
Hamzah, F.dan M. Trenggono. 2013. Oksigen Terlarut di Selat Lombok. Jurnal Kelautan Nasional, 9(1), 21-35
Mahaffey, C., Palmer, M., Greenwood, N. and Sharples, J. 2020. Impacts of climate change on dissolved oxygen concentration relevant to the coastal and marine environment around the UK. MCCIP Science Review 2020, 31–53
Moniharapon D, Indra Jaya, Manik H, Pujiyati S, Hestirianoto T and Syahailatua A.2014. Zooplankton Vertical Migration in the Banda Sea. Jurnal Kelautan Nasional 9 (3) 143-151. (in Indonesian).
Parsons, T. R., Yoshiaki, M., &Lalli, C. M. 1984. A Manual of Chemical and Biological Methods for Seawater Analysis. Pergamon Press, New York.
Setyobudiandi, I. 1995. Teknik Pemeliharaan Moluska. Materi Pelatihan Sistem Operasi Pengendalian dan Pemeliharaan Air Laut. Bogor: Fakultas Perikanan IPB.
Susanto, R. D., Gordon, A. L and Sprintall, J. 2012. Observations and proxies of surface layer throughflow in Lombok Strait. J. Geophys. Research, 112.
Sutadian, A.D. Muttil, N., Yilmar, A.G., Perera,B.J.C. 2015. Development of River Water Quality Indices Review. Environ. Monit. Asess. 188 (1), 58.
Schumacher, J., Dolch, T., Reise, K. 1930.Transitions in sandflat biota since the 1930s: Effects of sea-level rise, eutrophication and biological globalization in the tidal bay Konigshafen, northern Wadden Sea. Helgol. Mar. Res. 2014;68:289-298.
Tchernia, P. 1980. Descriptive Regional Oceanography. First Ed. Vol.3. Pergamon Marone Series. British Library.
Tyagi, S., B. Sharma, P., Singh, R., Dobhal. 2013. Water Quality Assessment in Terms of Water Quality Index. American Journal of Water Resources. 1 (3), 34-38
Townhill, B.L., Van der Molen, J., Metcalfe,J.D., Simpson, S.D., Farcas, A and Pinnegar, J.K. 2017a. Consequences for climate-induced low oxygen conditions for commercially important fish. Marine Ecology Progress Series, 580, 191–204.
Townhill, B.L., Pinnegar, J.K., Righton, D.A. and Metcalfe, J.D. 2017b. Fisheries, low oxygen and climate change: how much do we really know. Journal of Fish Biology,90, 723–750.
Wibisono, M. S. 2005. Water Quality in Warm Water Fish Ponds. Aubrn University. Agriculture. Pengantar Ilmu Kelautan. Jakarta: PT. Gramedia Widiasarana Indonesia Boyd, C. E. 1982.