Biology Reference
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Troell et al. (1997) evaluated the possibility of cultivating the red algae
Gracilaria chilensis (Gracilariales, Rhodophyta) adjacent to salmon cages,
so that the plants can utilise the released dissolved nutrients. At the fi rst
station (10m from the fi sh cages) the growth rate of Gracilaria was higher
up to 40% (specifi c growth rate: 7%/d) compared to the second and third
stations (150 and 1km distance), respectively. Close to the cages nitrogen
and phosphorous contents were higher in algal tissues (1.9-2.1 mmol
N/g (dry weight; dw) and 0.28-0.34 mmol P/g (dw) compared to the
other distances. Furthermore, 1 ha cultivation of the algae, close to the fi sh
cages, resulted in 5% removal of dissolved inorganic nitrogen and 27% of
released dissolved phosphorous.
Rhodovulum sulfi dophilum was grown in settled undiluted and
nonsterilised sardine processing wastewater (SPW). Three levels of
inoculum size (10, 20 and 30% v/v) were developed in glutamate-malate
media (GMM) or settled and undiluted SPW. The results showed that
highest biomass production was 4.8 g/l and reported after 96 h culture
with 20% (v/v) inoculum size. The chemical oxygen demand (COD)
decrease of SPW was greatest (85%) after 120 h culture with 30% (v/v)
inoculum developed in GMM, whereas COD reduction of SPW was up to
79-83% when the inoculum was developed in SPW (Azad et al . , 2003).
Bender et al. (2004) investigated the effi ciency of a waste effl uent
treatment system for black sea bass ( Centropristis striata ) recycled-water
mariculture. A biosolar fi lter system based on fl uidised sand fi lters and
microbial mats, which contained the cyanobacteria, Oscillatoria sp., on the
upper surface and the purple non-sulphur bacterium, Rhodopseudomonas
sp., below the surface, was constructed for fi sh waste bioremediation.
When the microbial mat surfaces were covered with wastes, the fi sh
wastewater was circulated under the mats, rather than on the surface.
The results showed that the microbial mats effectively removed ammonia,
due to cyanobacteria oxygen production which supported nitrifi cation. In
addition, oxygen concentrations ranged between 6 and 10 mg/L and total
ammonia concentration remained below 1 mg/l ( Figs. 9.4 a nd 9.5 ).
Fish-processing wastewater were used as a medium for cultivating
the proteolytic yeast, Candida rugopelliculosa , as a diet for seed rotifer,
Brachionus plicatilis. Fish processing wastewater were inoculated with
a seed culture of C. rugopelliculosa and then fed into two continuous
stirred tank reactors (CSTRs). On the other hand, the seed rotifer cultures
were separately inoculated into two different media, which contained
C. rugopelliculosa and Saccharomyces cerevisiae (used as commercial diet).
Media containing C. rugopelliculosa was benefi cial for rotifer growth, and
increased cell population by 18.3% compared to the medium containing
S. cerevisiae . Maximum growth of C. rugopelliculosa was (6.09 ± 0.04) x 10 6
cells/ml and reduction of infl uent soluble chemical oxygen demand,
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