Evaluation of Addition Chromium Feed to the Efficiency of Gouramy (Osphronemus goramy) Nursery Time
This research aims to determine the efficiency of gouramy nursery time by providing chromium feed. Chromium feed is carried out by adding lemna meals containing chromium to commercial feed with Cr concentration of each treatment at 0 ppm; 1.3 ppm; 1.5 ppm; and 1.7 ppm. Based on preliminary test Lemna sp. which was cultured in tannery wastewater for five days could accumulate Cr in the tannery wastewater in its tissue in an organic form of 2,319 mg kg-1. This research was conducted using a completely randomized experimental design (CRD) method with four treatments. Treatment A (Control commercial feed without Lemna), B (Commercial feed + Lemna 56.06 g kg-1), C (Commercial feed + Lemna 64.68 g kg-1), D (Commercial feed + Lemna 73.31 g kg-1) and each treatment was repeated four times. The addition of Cr in commercial feed can give significantly different results on increasing the absolute length of gouramy fry, while in survival it does not give a real difference. Giving Lemna sp. with Cr 2,319 mg kg-1 content as much as 73.31 g kg-1 in commercial feed or equivalent to 1.7 ppm Cr produces survival rate, absolute length increase and the best maintenance time efficiency in gouramy fry successively at 87.5 ± 5%; 1.89 ± 0.04 cm and with a maintenance time of 42 days to achieve an increase 2 cm length, 1.6 times faster than the control treatment.
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