Nutrient analysis and value addition of underutilized fish
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Date
2004
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Department of Home Science, College of Horticulture, Vellanikkara
Abstract
Fish contains the best proteins and other superior nutritional constituents
that place them in a specially important category of food. It has very poor shelf life.
Hence, the present study on nutrient analysis and value addition of under utilized fish
was aimed at evaluating the nutrients and developing products from three under
utilized fish varieties namely netholi (Stoliphorus heterolobus), flat fish (Cynoglossus
macrostorus) and veluri (Kovala kova/). This will help in meeting the increasing
demand for fish; to avoid wastage of small fish and to provide income to the fisher
women.
The fresh and dried fish varieties were analysed for chemical constituents
like moisture, fat, protein, calcium, phosphorus, iron, vitamin A and peroxide value.
Fish was found to be rich sources of protein, calcium and phosphorus. Chemical
constituents varied significantly between the varieties.
The dried fish was packed in polythene covers and was stored for a period
of three months. The peroxide value increased during the storage but the increase was
not significant. Dried netholi had the highest peroxide value throughout the storage
period. The organoleptic qualities decreased during storage. The change of
organoleptic scores was not significant; veluri had the highest acceptability throughout
the storage period. Microbial enumeration revealed that bacterial population increased
I
slightly during storage and fungus was found only in second and third month of
storage. No traces of yeast were found throughout the storage period.
The pickle prepared from fresh and dried fish was stored in glass bottle and
polyester laminated HDPE film for a period of six months. The peroxide value of the
pickle increased during the storage but the increase was insignificant. The acidity of
the pickle increased significantly. The pickle stored in flexible packaging material had
higher peroxide value and acidity than pickle stored in glass bottle. Dried fish pickle
had higher peroxide value and acidity than fresh fish pickle.
The organoleptic evaluation of pickle revealed that appearance and colour
decreased during storage. The flavour texture, taste and overall acceptability of pickle
increased during storage. Changes in organoleptic scores except appearance were
insignificant. Appearance decreased significantly. The pickle stored in glass bottle had
better acceptability than pickle stored in polyester laminated IIDPE film, but the
variation was insignificant. The fresh fish pickle had better acceptability and among
them veluri pickle was found to be the best. A gradual increase in the bacterial and
fungal load with storage of pickle was observed but yeast was not found during the
storage.
The benefit cost analysis showed that all products had BC ratio above one
hence, all are economically beneficial.
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Citation
172279