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Use of biomass of the marine microalga Isochrysis galbana in the nutrition of goldfish ( Carassius auratus ) larvae as source of protein and vitamins
Author(s) -
Coutinho Paula,
Rema Paulo,
Otero Ana,
Pereira Oscar,
Fábregas Jaime
Publication year - 2006
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2006.01492.x
Subject(s) - biology , isochrysis galbana , carassius auratus , biomass (ecology) , vitamin , aquaculture , zoology , commercial fish feed , larva , food science , vitamin c , vitamin e , botany , fish <actinopterygii> , fishery , agronomy , antioxidant , biochemistry
The effect of the replacement of fish protein hidrolizate and vitamin premix by freeze‐dried biomass of the marine microalga Isochrysis galbana in the feed for goldfish ( Carassius auratus ) larvae was tested. Larvae (3.4±0.7 mg) were fed with three experimental microparticulated diets that differ from each other in the percentage of replacement of fish protein hidrolizate (25% or 100%) or vitamin premix by I. galbana biomass. The control diet and the diet containing microalgae biomass as a substitute of 25% of fish protein hidrolizate (MP 25 ) presented the highest survival, being almost 100%, with no significant differences between them. Survival in diets in which 100% of fish protein hidrolizate (MP 100 ) or vitamin premix (MV) had been substituted by microalgal biomass was 78% and 66% respectively. Growth, measured as weight, was lower than with the control diet in all treatments in which microalgal biomass was included, with lowest results being obtained with the MP 100 diet. Differences between treatments and control were lower when growth was measured as length. The harvesting and processing microalgae biomass is crucial to maintain the nutritive value and could be the cause for the obtained results.