| dc.description.abstract | Solution of fabric softener contained cationic surfactant by type quaternary
ammonium chloride compounds that harm aquatic life and the environment led to
the death of fish . This reaserch intend to determine the level of attack power and
influence of fabric softener toxicity to carp seed , this research had been on July -
November 2013 in the Department of Agriculture and Marine Medan .
Stages of testing include : a preliminary test , a definitive test to determine
the LC50 until 96 hours and sublethal tests with various concentrations . The
results showed of the preliminary test studies have upper threshold value ( N ) of
100 ppm and below the threshold value ( n ) 75 ppm . Test results obtained
definitive 96 -hour LC50 value of 87.10 ppm . The test results on the highest
survival sublethal concentration of 2.61 ppm treatment that is equal to 80 % while
the lowest survival at 7.84 ppm concentration and 46.66 % , the highest feed
efficiency at treatment concentrations of 2.61 ppm is equal to 4.98 % and the
lowest in the treatment of 1:55 7.84 % , and the highest growth rate in the
treatment concentration of 2.61 ppm is 0.15 % while the lowest at treatment
concentrations of 7.84 ppm at 0.05% . Water quality parameters were observed
during the definitive test decreased DO 2.0-6.4 mg / l , the temperature increased
27.1 - 30.20C and pH decrease during each treatment concentration of 3-6.6 .
Water quality parameters at sublethal test that does not decrease drastically DO
range 5.2-7.6 mg / l , temperature range 27 - 290C and a pH range of 3.4-7 | en_US |
