en |
EFFECT OF SMOKING AND SUN DRYING ON PROXIMATE COMPOSITION OF Diplotaxodon FISH SPECIES (NDUNDUMA) FROM LAKE MALAWI, MALAWI
Msuku, L & Kapute, F
Abstract
Processed fish and fish products have high nutritional value, longer shelf life and fetch
better prices on the market in contrast to freshly caught fish which are highly perishable.
Processing, however, alters nutrient composition of a product underpinning the need for
caution when consuming processed products. The study analyzed the effect of traditional
smoking and sun drying on proximate composition (moisture, protein, fat and ash) of
Diplotaxodon species locally known as Ndunduma. This is an important commercial
cichlid species harvested across the entire Lake Malawi by both artisanal and commercial
fishers. Fresh Diplotaxodon fish samples were collected from fishers’ boats in the south-western
part of Lake Malawi, Malawi immediately after catch early in the morning. The
fish were washed then weighed and thereafter, smoked in a traditional smoking kiln and
sun dried on reed mats. Determined percent moisture, protein, fat and ash content for
smoked fish were: 12.22±0.05, 55.30±1.67, 25.31±2.78 and 12.96±0.72, respectively,
while corresponding values for fish that were sun dried were: 24.28±0.14, 52.80±1.28,
22.36±0.26 and 13.81±0.14, respectively. Overall, results show reduced protein content
in processed fish (smoked and sun dried) (P<0.05) although not significantly different in
smoked fish (P>0.05). Significantly low moisture content in smoked fish is indicative of
a product with longer shelf life since moisture favours rapid microbial growth causing
freshness quality deterioration. Although not significantly different, high fat (P>0.05)
and ash (P<0.05) in smoked fish is consistent with a nutrient rich product. The study
concludes that smoked Diplotaxodon species is more nutritious and may present better
storage qualities than sun dried due to relatively low moisture. Caution should,
nevertheless, be considered due to the high fat levels to prevent spoilage caused by
breakdown of fats. Since smoked products are of high commercial value, fish processors
should be encouraged to smoke fresh Diplotaxodon species other than sun drying.
Keywords
Diplotaxodon species; Ndunduma; processing; proximate composition; Lake Malawi
|