Page 44 - Aquauclature Research and Studies (01)

AQUAUCLATURE
34
Research and Studies 1 (1): 15-01, 2026 page of 193

biofuel production. Furthermore, microalgae-derived biodiesel has proven to
have broad application prospects, although these are still in the exploration
stage (Junying et al., 2013). The relatively high cost of microalgal oil produc-
tion is a major obstacle, which needs to be compensated through technologi-
cal developments (Rawas et al., 2013). The main environmental factors af-
fecting carbohydrate accumulation are light intensity, pH, salinity, and tem-
perature, while nutritional factors include the abundance and source of nitro-
gen, carbon, phosphorus, sulfur, and iron (Chen et al., 2013; Marco et al.,
2014).
Nutrient uptake from various ADE products based on manure and indus-
trial wastes for biomass, lipids, carbohydrates, and proteins has been evalu-
ated in Chlorella species, where effluent sources included poultry manure
(Singh et al., 2011). Mixed cultivation, using organic or inorganic CO2
sources in the presence of light, is a good strategy for achieving high biomass
and higher lipid content (Choi and Yu, 2015; Lin and Wu, 2015). Sharma et
al. (2016) studied the effect of different carbon sources (fructose, glycerol,
glucose, and sodium acetate) on the growth and lipid content of five Chlorella
species grown in BG-11 medium under the same conditions.
Rumen fluid is one of the most sophisticated microbial ecosystems in
nature, consisting of all the microorganisms living in a given area. Biotic and
abiotic factors work together, providing a bioreactor (the rumen) and a pre-
processed carbon source (plant material), which in turn receives carbon and
energy in a suitable chemical form. Overall, this system can be considered a
"super-metabolism." Thus, the rumen represents a very similar solution to a
current industrial problem called the biorefinery, which aims to bio-convert
lignocellulosic materials into fuels and chemicals (Sauer et al., 2012). The
rumen contains tannins (Jayanegara et al., 2009) and saponins (Ben et al.,
2006). At low concentrations, tannins may provide beneficial effects by reg-
ulating the rate of nitrogen release in the rumen (Naumann et al., 2017). How-
ever, a slight change in the rate of feed decomposition by tannins can reduce
the release rate of many nutrients, especially proteins, which may in turn in-
crease microbial efficiency (Makar, 2005). Tannins and saponins are also ca-
pable of modifying the chemical composition of microbes, leading to changes