The Biochemical Composition Of Seaweeds From The Persian Gulf And The Effect Of Seaweed Extract On The Growth And Biochemical Composition Of Microalgae Cultured As Live Food For Penaeus Indicus Larvae
Loading...
Date
2011-05
Authors
Ghadikolaei, Kiuomars Ranioh
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The biochemical composition of three groups of seaweeds; green (Ulva lactuca
and Enthromorpha intestinalis), brown (Sargassum illicifolium and Colpomenia
sinuosa) and red (Hypnea valentiea and Gracilaria corticata) from the Persian Gulf
and the effects of seaweed extracts (SWE) either as a supplement or as a substitute
media to the f/2 medium on the growth and composition of two microalgae
Isochrysis galbana and Chaetoceros muelleri cultured as live food for Penaeus
indicus larvae were investigated.
Results showed that seaweeds were relatively high in carbohydrate and ash, but
low in lipid. Lipid content in green (U. lactuca and E. intestinalis) seaweed was
significantly higher than both the red and brown seaweed (P < 0.05). Protein content
of red (G. corticata) and green (U. lactuca and E. intestinalis) seaweeds was notably
higher than brown seaweed (P < 0.05). The green (U. lactuca) and red (H. valentiea)
seaweeds had the highest proportion of saturated fatty acids, while the brown (S.
illicifolium and C. sinuosa) and red (G. corticata) seaweeds had the highest
proportion of monounsaturated and polyunsaturated fatty acids, respectively. The
mineral compositions in seaweeds were found in the sequence of K>Mg>Fe>Zn>Mn>Cu>Co.
The study clearly showed that the two microalgae I. galbana and C. muelleri
could be successfully cultured using the various SWE either as a supplement or as an
alternative to the f/2 medium. Since no major changes were found in most of the
measured growth parameters, proximate biochemical composition, important
polyunsaturated fatty acids and minerals content following culture of the microalgae
with SWE as an alternative media, particularly extracts of U. lactuca, E. intestinalis
and G. corticata, it was concluded that these SWE are able to provide the necessary
nutrients for microalgae growth and could be used as a possible substitute to reduce
microalgae production costs, at least two times lower than conventional f/2 medium,
in establishing microalgal populations to use in aquaculture operations.
Description
Keywords
The biochemical composition of three groups of seaweeds , from the Persian Gulf effects of seaweed extracts