Preservation of Smoked African Catfi sh, Clarias gariepinus Burchell against Dermestes maculatus De Geer (Coleoptera: Dermestidae) using Neem Seed Oil-iodized Salt Mixtures
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Date
2016-10-15
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Publisher
Faculty of Agriculture, University of Zagreb, Svetošimunska
Abstract
Dermestes maculatus is a major fish pest causing serious damage when left uncontrolled. Th is work identifies the fatty acids of Nigeria-obtained neem seed oil (NSO) and the potential of different mixtures of the NSO and iodized salt in the control of the pest. Seven fatty acids: palmitic acid (18.09%), linoleic acid (33.73%), stearic acid (14.37%), oleic acid (13.4%), octadecanoic acid (12.93%), 9, 12– octadecadienoic acid (1.47%) and arachidic acid (3.33%) were identified in the NSO. Percentage of D. maculatus adult mortality (100%) observed in fi sh treated with 0.00 μl NSO + 0.50 mg salt, 100 μl NSO + 0.125 mg salt and 0.00 μl NSO +
0.25 mg salt was significantly (p<0.05) different from mortality observed in untreated fish (31.25%). Percentage of live larvae (0.0%) in fi sh treated with 0.50 mg salt + 0.00 μl NSO, 100 μl NSO + 0.125 mg salt, 0.00 μ1 NSO + 0.25 mg salt and 50 μl NSO + 0.125 mg salt was significantly lower than 63.97% observed in the control. Percentage of weight loss of untreated (75.10%) and 50 μl NSO-treated fi sh (69.65%)
was significantly higher than values obtained from fi sh treated with 0.5 mg salt (26.93%), 100 μ1 NSO + 0.125 mg salt (25.73%) and 0.25 mg salt (23.63%). Application of NSO-iodized salt did not change the colour and odour of treated fish. Consumers significantly rejected fi sh treated with ≥ 50 μl NSO.
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Keywords
consumers’ acceptability, Dermestes maculatus, iodized salt, neem seed oil, smoked fish