Quality assessment of shrimps (Penaeus monodon) cultured by intensive and extensive methods
1994
Dela Cruz, A.R.G. (Philippines Univ. in the Visayas, Leganes, Iloilo (Philippines). Coll. of Fisheries)
Total plate counts (TPCs) and Escherichia coli counts of pond waters were significantly affected by the culture method and stage of culture. The use of animal manure, particularly in extensive culture method, affected the TPC and E. coli counts of water only at the initial stage of culture. Microflora of pond water is not affected by the culture method used. All pond waters were dominated by Enterobacteriaceae, Pseudomonas and Bacillus, at the initial stage of culture; Enterobacteriaceae, Pseudomonas and Vibrio at the middle; and predominantly Enterobacteriaceae at the end of the culture. Pathogens such as Vibrio spp. and Salmonella, were also detected regardless of method used. TPCs of newly harvested shrimps were significantly higher in samples from extensive culture ponds but not during storage in ice. Initially, microflora of shrimps harvested from intensive culture ponds were dominated by Bacillus, Enterobacteriaceae and Aeromonas while extensive culture ponds were dominated by Enterobacteriaceae, Staphyloccus, Aeromonas and Pseudomonas. TPC's of shrimps were significantly higher than TPC's of water. However, no correlation could be established between the microflora of shrimps and that of the pond water. K-value, AA-N and pH of shrimps stored in ice had high correlation with storage time. However, these were not significantly affected by the culture method used. Proximate compositions of shrimps showed significantly higher protein and moisture contents on shrimps cultured by the intensive method while higher fat content on shrimps cultured by the extensive method. Ash content of shrimps were not affected by the method of culture
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