Oxidative stability and proximate composition of silver cyprinid (Rastrineobola argentea) used for fishmeal in East Africa
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Applied Aquaculture
Abstract
Fishmeal and oils used for feed formulation contain polyunsaturated
fatty acids (PUFAs) that are easily oxidized, and affect farmed
fish. In this study, the effects of season (dry orwet), drying methods
(i.e., artisanal: bare ground, rock surface,meshes laid on the ground
or raised racks or adopted), aswell as storage time on Rastrineobola
argentea used for fishmeal in East Africa were examined. Lipid
oxidation and proximate composition stability were determined
at 30-day intervals over a period of 90 days. Lipid oxidation stability
was monitored by determining free fatty acids (FFA), peroxide
value (PV) and thiobarbituric acid-reactive substances (TBARs).
Changes in proximate composition were based on moisture, ash,
crude protein (CP), crude fat (EE), and gross energy (GE). The
relationships among lipid oxidation and proximate composition
parameters were also explored. Considerable oxidative rancidity
reflected by significantly high levels of FFA, PV, and TBARs in dried
R. argenteawas recorded in thewet than in the dry season.Drying
of R. argentea on bare ground andmeshes laid on the ground led to
higher lipid oxidation than drying on raised racks. Lipid oxidation
was also significantly higher in salted and indirectly dried
R. argentea than in the unsalted and directly dried samples. Dry
matter tended to decrease with storage time, as ash was high in
salted samples and those dried on bare ground. There was
a general decrease in EE content with storage time that coincided
with peroxidation. However, CP and GE were less affected by
season, processing methods and storage time. Drying R. argentea
on raised racks was the best among the processing method
investigated.
Description
Keywords
Lipid oxidationprocessing methods, Proximate composition, Rastrineobola argentea, Seasonality, Storage time
Citation
Godfrey Kawooya Kubiriza, Drake Ssempijja, Edward Mubiru, Nathan Semwanga, Cyprian O. Odoli, Julliet Zalwango & Margaret Masette (2021) Oxidative stability and proximate composition of silver cyprinid (Rastrineobola argentea) used for fishmeal in East Africa, Journal of Applied Aquaculture, 33:3, 246-266, DOI: 10.1080/10454438.2020.1727808