The Effect of Fermented Organic Feed on The Performance of Oithona sp . in Semi-Mass Culture

This research was aimed to know the effect of different fermented organic feed on the growth performance of Oithona sp. in semi-mass culture condition. The Oithona sp. cultures were fed with mixed organic fermentation of pulp, bran and fish meal by using probiotic microbes and phytoplankton cells. There were 4 treatments and 4 replicates in this study. Treatment A was the Oithona sp. cultured with addition of Chaetoceros calcitrans cells (2x10 6 cells ∙ mL –1 ) without fermented organic feed (0 g ∙ L –1 of medium culture). While B, C, and D with addition of C. calcitrans cells and 0.5, 1.0, and 1.5 g ∙ L –1 of fermented organic feed, respectively. The results showed that the dosage of fermented organic feed had significantly different effect (P < 0.05) on the growth performance of Oithona sp. culture. The best growth performance of Oithona sp. shown at the addition of 0.5 g ∙ L –1 of fermented organic feed, with total density of 7.09 ± 0.11 ind ∙ mL –1 , population growth rate of 0.116 ± 0.002 ind ∙ d –1 and eggs production of 7.88 ± 0.93 eggs ∙ ind –1 of adult.

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