scholarly journals Physical, chemical, and biological data for selected streams in Chester County, Pennsylvania, 1981-94

1999 ◽  
Author(s):  
Andrew G. Reif
Keyword(s):  
Biological Data ◽  
Physical Chemical ◽  
Chester County

scholarly journals TUDI DAYA DUKUNG SUMBER DAYA IKAN DI WADUK JATIBARANG SEMARANG

2020 ◽  
Vol 26 (1) ◽  
pp. 1
Author(s):  
Aisyah Aisyah ◽  
Setiya Triharyuni ◽  
Eko Prianto ◽  
Rudy Masuswo Purwoko
Keyword(s):  
Water Level ◽  
River Basin ◽  
Carrying Capacity ◽  
Biological Data ◽  
Water Level Fluctuations ◽  
Production Potential ◽  
Fish Resources ◽  
Physical Chemical ◽  
Level Elevation ◽  
Water Depths

Waduk Jatibarang merupakan waduk yang belum lama beroperasi dan masih tergolong waduk baru. Kegiatan perikanan yang berkembang didominasi oleh perikanan pancing. Selain penangkapan, peningkatan produksi juga dilakukan dengan penebaran ikan, namun belum didukung kajian daya dukung yang memadai. Penelitian ini dilakukan untuk mengetahui nilai daya dukung sumber daya ikan di waduk Jatibarang. Kegiatan penelitian dilakukan pada Bulan Mei dan Juli 2018 yang meliputi 4 (empat stasiun yang mewakili inlet, tengah dan outlet waduk. Data primer yang dikumpulkan meliputi kualitas air (parameter fisika, kimia dan biologi). Data pendukung penelitian meliputi elevasi muka air, diperoleh dari Balai Besar Wilayah Sungai Pemali-Juana, dan data kedalaman, diperoleh dari akuisisi data GPS Sounder. Hasil penelitian menunjukkan bahwa nilai daya dukung sumber daya ikan di Waduk Jatibarang berkisar antara 3,57-6,3 ton/tahun. Kedalaman perairan sangat mempengaruhi nilai daya dukung. Nilai daya dukung lebih rendah pada kedalaman perairan lebih dari 20 m dan relatif tinggi pada kedalaman lebih dari 10 m. Selain pengaruh kedalaman juga terdapat pengaruh lain seperti fluktuasi muka air, kelimpahan plankton, kecerahan, dan unsur hara berupa nitrat. Diharapkan kajian terkait potensi produksi dapat dilakukan untuk optimalisasi pemanfaatan perikanan yang berkelanjutan.Jatibarang Reservoir is a new operating reservoir. Existing fishing activities are dominated by handline. Except fishing activities, many fish have been stocked to improve the production, but it has not been supported by adequate carrying capacity studies. The purpose of this research was to determine the value of carrying capacity of fish resources in the Jatibarang Reservoir. The study was conducted in May and July 2018 representing the inlet, center, and outlet of the reservoir. The collected data consisted of physical, chemical, and biological data obtained at 4 (four) research stations representing the inlet, center, and outlet of the reservoir. Supporting data include water level elevation obtained from the Pemali-Juana River Basin Authority and bathymetry data obtained from GPS Sounder data acquisition. The results showed that the value of carrying capacity of fish resources in the Jatibarang Reservoir is 3.57-6.3 tons/year. The depth of the waters greatly affects the value of carrying capacity. The value of smaller carrying capacity occurs at the water depths of more than 20 m, but is relatively high at the depths of more than 10 m. There are also other influences such as water level fluctuations, plankton abundance, water brightness, and nitrates. Furthermore, a study of production potential should be carried out to optimize the sustainable fisheries utilization.

Physical, Chemical and Biological Data Report Cruise SQ87, 28 April - 23 May 1987

1990 ◽  
Author(s):  
T. L. Hayward ◽  
A. W. Mantyla ◽  
P. P. Niiler ◽  
K. M. Plummer
Keyword(s):  
Biological Data ◽  
Physical Chemical

41.—The Impact of Artificial Radioactivity on the Oceans and on Oceanography.

1972 ◽  
Vol 72 (1) ◽  
pp. 411-423 ◽  
Author(s):  
A. Preston ◽  
D. S. Woodhead ◽  
N. T. Mitchell ◽  
R. J. Pentreath
Keyword(s):  
Public Health ◽  
Marine Pollution ◽  
Critical Path ◽  
Public Health Problem ◽  
Biological Data ◽  
Radioactive Material ◽  
Power Sources ◽  
Analysis Techniques ◽  
Physical Chemical ◽  
The Impact

The major impact of artificial radioactive material on the oceans has been as a potential pollutant, and, in particular, concern has centred on the public health problems that might arise through human exploitation of marine environments. This public health problem has been an important stimulus to marine pollution methodology. The development and deployment of critical path analysis techniques to the control of this material and to the assessment of its significance for human radiation exposure (Preston 1969; Foster, Ophel and Preston 1971; Slansky 1971) not only exemplifies the control of a chemical pollutant but has served as a stimulus to produce much of the basic physical, chemical and biological data required for its proper implementation. In more recent years the advantages which labelled environments confer for studies of a much wider physical, chemical or biological nature are being increasingly recognised (Natn. Sci. Fdn 1971; Volchoket al.1971; Lowman, Rice and Richards 1971; Duursma, 1972; Preston, Jefferies and Pentreath 1972,) and many of the tools of nuclear technology, radio-isotopes, reactor propulsion systems, isotope power sources, neutron activation analysis techniques, etc., will enjoy an increasingly important role in oceanography, not only in basic investigations but also in the rational exploitation of marine resources.

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