Document
Metadata
Title
adaptationdelaspirulinedusudde madagascaralacultureeneaudemer. miseaupointdestructuresdeproduction al’echellevillageoise
Authors
JARISOA Tsarahevitra
Research Topic
Abstract
The aim of this study is to carry out a rustic culture system suitabled on a village scale in the
purpose of fighting against malnutrition in the south of Madagascar. We use the Malagasy
brackish water strain, isolated from Toliara region and cultivated in different culture medium. The
seawater culture medium was obtained after treating the seawater by precipitating out calcium and
magnesium by addition of Na2CO3 and NaHCO3. Indeed the high Ca and Mg concentrations in
seawater inhibit the growth of Spirulina. The treated seawater is enriched with phosphorus,
nitrogen and iron. As the treatment of seawater for the culture of Spirulina is expensive and time
consuming, culture tests were carried out with different treatments using Spirulina paracas, a
strain isolated from Paracas in Peru, which naturally grows in water rich in calcium and
magnesium.
The harvested biomasses of Spirulina grown in 10 m² ponds in treated and enriched seawater
were comparable to those obtained in standard bicarbonate medium, averaging 2 g m-2 j-1 (dry
weight) during four months.
Both Malagasy and Paracas strains can be grown in an untreated and enriched seawater medium,
however after 15 days the biomass increases with the degree of treatment of seawater.
Spirulina culture in seawater is possible, but a better yield is obtained after treatment (precipitation
of Ca and Mg).
We evaluated the cost of production using the result of experiments carried out in 10 m² pounds.
Then we tried to optimize the culture system in the purpose to decrease the cost and therefore to
be compatible with a community village production. This village production can be used to fight
against malnutrition in the south of Madagascar.
Structure of the village communities in the south of Madagascar is characterized by the presence
of traditional power lead by mpitoka hazomanga and State power lead by the State representative.
It is true that nowadays, traditional power has lost importance in favour of State power, but its
influence is still important. To be able to introduce the culture of Spirulina both influential powers
should not be ignored.
We propose a strategy based in individual families cultures. Every family will be trained to produce
Spirulina and sensitised to its use as a food supplement for children which are the main victims of
malnutrition.
In the long term, families can exploite their knowledge for commercial production purpose and
thus, improve their economic situations
Volume
1
Date of publication
March 24, 2005
Institution (University)
Institut Halieutiques et des Sciences Marines
Page numbers (pp)
172