Recursos Naturales >
Instituto de Investigaciones Marinas (IIM) >
(IIM) Artículos >
Closed Access item Effect of microalgal and inert (cornmeal and cornstarch) diets on growth performance and biochemical composition of Ruditapes decussatus seed
Fernández-Reiriz, María José
|Keywords:||Ruditapes decussatus, Seed culture, Inert food, Cornmeal, Cornmeal|
|Citation:||Aquaculture 160(1-2): 89-102 (1998)|
|Abstract:||Research was carried out into the effect of phytoplankton, cornmeal and cornstarch diets on
growth and biochemical composition of the seed of the little-neck clam, Ruditapes decussatus.
The seed of R. decussatus, fed on daily rations of Isochrysis galbana organic weight. of 0.5 and
1% of live weight of the seed, showed an improvement in growth rate when cornstarch, which is
99% carbohydrate, was added to these diets. Thus in the case of a daily ration of 0.5%, daily
growth rates increased by between 33.5 and 32.3%, depending on whether we are referring to
organic weight, dry weight or live weight, when 1.5% cornstarch was added. In the case of a
ration of 1% I. galbana, the addition of another 1% cornstarch lead to an improvement in daily
growth rates, depending on the different weight class in question, of between 14.1 and 15.5%.
When compared to a daily ration consisting of 2% phytoplankton, which was considered to be the
optimal ration for growth in the seed of these clams, the replacement of half the quantity of I.
galbana by a quantity of cornstarch of equivalent weight gave a growth rate in terms of organic
weight of 87.9% that of the phytoplankton diet, while the rates for dry weight and live weight
were 89.6 and 87.9%, respectively. These results improved noticeably when cornmeal, consisting
of 10% protein and 90% carbohydrate, was used instead of cornstarch. In the case of a 2%
phytoplankton diet, if we substituted an equivalent quantity of cornmeal for 50% of the phytoplankton, the growth rate in organic matter was the same 99.0%. as those for the diet
consisting of phytoplankton alone, while growth rates in dry weight and live weight were 6.2 and
5.9% higher, respectively, than those of the phytoplankton diet. It would therefore appear that
cornmeal and to a lesser extent cornstarch. can be successfully used as a partial substitute for
phytoplankton in diets for the seed of R. decussatus and its use in hatcheries and nurseries
devoted to the culture of this species would lead to a considerable reduction of production costs|
|Description:||14 páginas, 5 tablas, 1 figura|
|Publisher version (URL):||http://dx.doi.org/10.1016/S0044-8486(97)00232-9|
|E-ISSNmetadata.dc.identifier.doi = DOI:||10.1016/S0044-8486(97)00232-9|
|Appears in Collections:||(IIM) Artículos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.