ABSTRACT

DISTRIBUTION OF WATER DISSOLVED OXYGEN IN INTENSIVE PONDS
OF PASIFIC WHITE SHRIMP ( Litopenaeus Vannamei)

INDRAWAN PRASETYO HUDA
04/177858/PN/10070

This study has been conducted to identify distribution of water dissolved oxygen and the correlation with other water quality variables in intensive shrimp ponds. Three ponds were used in this study, each pond was 3,600 m2, used 8 Taiwanese paddle wheel and drainage central. Observation point based on paddle wheel placement. Water samples were observed and taken from 12 different area in the ponds, at morning and afternoon, and also at surface and bottom of ponds water. This research was held in the shrimp ponds of Company Indokor Bangun Desa, Subdistrict Srandakan of Bantul Regency. Observation has been conducted during 25 day when age of shrimp 60 day after disperse until age 85 day (at harvest). The water quality variables were observed consisted of dissolved oxygen, acid level (pH), temperature, salinity, free carbon dioxide, alkalinity, organic matter, visibility, plankton and potential redox of ponds bottom mud. The data of water dissolved oxygen were analyzed with analysis of variance (ANOVA) level 95 %, whereas in the correlation with other water quality variables were analyzed using the multiple linear regressions.

Result of study showed the distribution of water dissolved oxygen in the central drainage area was lowest. The content of water dissolved oxygen in the morning were lower than in the afternoon, and in the bottom were less than in the surface of water. The relationship of water dissolved oxygen with other water quality was described in equation Y = 51.165 – 4.64x10-4X1 – 3.19X2 – 0.424X3 – 0.723X4 – 9.8x10-2X5 - 1.52x10-2X6 – 2.7x10-2X7. The increasing of potential redox (X1: -558 s/d -324 mV), pH (X2: 6.5 – 8), temperature (X3: 27.5 – 31 oC), salinity (X4: 6 – 10 ppt), free carbon dioxide (X5: 12 – 26 ppm), alkalinity (X6: 236 – 325 ppm) and organic matter (X7: 18 – 95 ppm) was related with the decreasing of water dissolved oxygen (Y: 0.6 – 5 ppm).
Keyword : Distribution dissolved oxygen, water quality, pasific white shrimp ponds