Molasses (the secondary product of sugar industry) discharged to
watercourse has caused environmental pollution and has negative
impact on aquaticorganisms. A toxicity test of molasses on common
carp (C yp rin us ca rp io Linn)has been conducte. This research
aims to know lethal and sub lethal toxicity ofmolasses on
respiration of common carps (c. carpio L.). Static bioassay
wasemployed to measure the lethal toxicity. Meanwhile, the method
used for sublethal toxicity was experimental method with Group
Randomized Design(GRD) with four concentrations (0%,0,1%, 0,3% and
0,5%). The test fish usedin this experiment was C. carpio var.
Majalaya, with weight 2-4 gr and 100-110gr. The observation was
done on day 0 and 7 with 6 replicates. Parametersmeasured were
oxygen consumption rate, and opercular rate. The resultsshowed that
molasses was categorized as almost non toxic with LC50 96
hoursvalue 1,072% (10.720 ppm). The result of sub lethal test
showed that theincrease in molasses concentration decreased oxygen
consumption rate andincreased opercular rate of common carp.
Increase in molasses concentrationgave significant effect on the
increase in opercular rate. Meanwhile, thedecrease in oxygen
consumption rate and increase in haemoglobin was notsignificant.Key
word: Mo la sses, o XtJg en c on sum ptio n, h aem o glo bin , o
percu la r ra te , commo n ca rp(C yp rin us ca rp io L in r iJ . .
. . . _
