Effects of Two Heat Sources (Charcoal and Firewood) On the Nutritional Quality of Smoked Clarias Gariepinus
W. D. Adamu2 , N. A. Agbason1, S. Y. Olem3. G.A. Peter 2
ABSTRACT
This study was carried out to determine the effects of two heat sources (charcoal and firewood) on the nutritional quality of smoked dried Clarias gariepinus. Ten (10kg) of African catfish (Clarias gariepinus) were purchased from a Eazyjat fish farm along Kwandere Road Lafia. The fish samples were dressed by removal of gut contents and each treatments consists of five (5kg) of the fish and smoked using firewood and charcoal produced from Iron Wood. The organoleptic assessment was carried out by 90 panelists for the period of three months. The sensory evaluation of the smoked dried fish was done using five likert scales; Excellent (5), very good (4), good (3), poor (2) and very poor (1). The results of the study showed that fish smoked with charcoal was significantly different (P<0.05) from fish smoked with firewood. The mean values of the proximate parameters for fish smoked using firewood were 7.66, 7.85, 52.80, 25.75, 2.23 and 3.72% for moisture content, ash, crude protein, ether extract, crude fibre, and nitrogen free extract respectively while fish smoked using charcoal source of heat were recorded as 6.02, 9.38, 52.06, 25.83, 2.16, and 4.54 for moisture content, ash, crude protein, ether extract, crude fibre, and nitrogen free extract respectively. There was significant differences (P<0.05) in the values of bacterial colonies observed in the study. The number of bacterial isolate from charcoal smoked fish with respect to months are 3.12±0.12, 4.24±0.22, and 4.36±0.43 in 1st, 2nd and 3rd Month with a mean of 3.91 respectively. The firewood smoked fish was recorded as 4.74±0.05, 6.78±.009 and 7.87±0.15 in 1st, 2nd and 3rd Month with a mean of 6.46 respectively. Fish smoked with charcoal heat source was recorded with the highest fungus colonies in the 3rd month (5.47±0.45)which slightly deviated from the numbers obtained in the 2nd month (5.03±0.05) while the lowest was recorded in the 1st month (4.72±0.65) with a mean value of 5.07. The panelist rated charcoal smoked fish as the best for sensory evaluation parameters including general acceptability. For consumer’s health and safety against microbes, personal hygiene and environmental hygiene is to be maintained in order to prevent contamination of fish during smoking.
Keywords: Smoking, nutritional quality, microbial isolates
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