The bacteriological quality of chicken offal and spoiled egg as feed for Catfish and Tilapia Rearing in Penang, Malaysia

Abstract

Chicken offal, spoiled egg and commercial fish feed were used as feed in cultured ponds of catfish and tilapia in and around Penang, Malaysia. The total aerobic bacteria, coliform and fecal coliform was investigated on catfish (Clarias gariepinus) , tilapia (Tilapia mossambica) and its water. A total of 48 samples (12 intestine of catfish, 12 intestine of tilapia, 24 water samples) were taken from 8 pond in and around Penang, Malaysia. All fish samples fed by chicken offal or spoiled egg were heavily contaminated by total aerobic bacteria (5 to 7.26 log10 cfu/gr), coliform (2800 to 11000 MPN/gr) and fecal coliform (3 to 430 MPN/gr). Meanwhile, fish fed by commercial pellet were less contaminated by total aerobic bacteria (5.33 to 6.58 log10 cfu/gr), coliform (7 to 11000 MPN/gr) and fecal coliform (3 to 110 MPN/gr). Chicken offal and spoiled egg polluted the water in aquaculture system more than commercial fish feed. The highest l evel of total aerobic bacteria, coliform, fecal coliform in pond water were 7.21 log10 cfu/ml, 11000 MPN/ml and 2800 MPN.ml. The bacteria load of chicken offal and spoiled egg might contaminate catfish, tilapia and its water. These will be a concern for quality and safety of catfish and tilapia in term of nutrition and human health.