Utilization of hydrolized duckweed (Lemna minor) meal as a soybean replacement in Nile tilapia (Oreochromis niloticus) diet,
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Date
2017Author
Karoza, Stephano Adrian
Jusadi, Dedi
Suprayudi, M. Agus
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Show full item recordAbstract
Tilapia is a fast growing fish widely cultured in many tropical and sub
tropical countries. The recent production figures reported our global production
estimates for 2015 is 5,576.8 metric tons. In developing countries the major
challenges facing aquaculture industry is high cost of production associated with
fish feeds. Feed represents 40-70% of operating costs for aquaculture operations,
increasing expenses and potential declining supplies soybean meal have led
scientists to search for less expensive but compatible alternative protein sources
for fish feed; most of which are based on animal or plant protein sources. The
objectives of study was to determine the incubation period for hydrolysis of
duckweed and to evaluate the use of hydrolized duckweed as aprotein source for
the growth performance of Nile tilapia
Three experiments were conducted to determine the composition and
digestibility of hydrolyzed duckweed meal by sheep rumen liquor as the
replacement of soybean meal in the diet of Nile tilapia. The first trial examined
the effectivity of sheep rumen liquor enzyme to decrease crude fiber contents of
(DWM), the added volume of sheep rumen liquor was 100 ml/kg DWM and then
it was incubated for 0, 12, 24 hr . The second trial was to evaluate the apparent
digestibility of hydrolyzed DWM for Nile Tilapia, apparent digestibility were
determined using chromic oxide indicator added to both reference diet and test
diets. The feed ingredients used in the trial were hydrolyzed DWM (HDWM) and
unhydrolyzed DWM (DWM). Ten fish with an average weight of 18±0.36g were
used in the trial and reared in the aquarium of size 30×40×50cm for 15 days; feces
were collected from three replicates using a fecal collection column attached to
the aquarium. Third trial was to evaluate the growth performance of Tilapia fed
test diet with hydrolyzed Duckweed meal (HDWM). The experimental design was
set according to completely randomized design with four treatments and three
replicates of HDWM inclusion levels that is 0%, 15%, 30% and 45%. Nile tilapia
fish with initial body weight of 18±0.36g was kept in 12 units aquarium size of
30×40×50cm at stocking density of 10fish/aquarium, the fish were fed two times a
day at 08:00am and 16:00pm to apparent satiation for a period of 60 days.
The results indicated that duckweed meal (DWM) hydrolyzed with 100
mL/kg and incubated for 24 hrs showed the lowest crude fiber contents of
13.68% compared to other treatments. Total digestibility of hydrolyzed duckweed
(HDWM) meal was 87.3% compared with unhydrolyzed duckweed (DWM)
which was 66.8%. Total final weight (TFW), survival rate (SR), specific growth
rate (SGR), feed conversional rate (FCR) and protein retention (PR) shows growth
performance at 15% inclusion. The results of this study showed that 100mL/kg
sheep rumen liquor at incubation period of 24 hr can be suitable for hydrolysis of
duckweed to reduce crude fiber also hydrolyzed duckweed can substitute soybean
meal at an incubation rate of 15% in the diet of Nile tilapia and had the same
growth and FCR with control diet
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- MT - Fisheries [2932]