Microbiological quality of frozen breaded fish and shellfish products.
ABSTRACT A survey was made of the microbiological quality of seven frozen, breaded, precooked fish and shellfish products and of frozen, breaded, uncooked shrimp at the retail level. Geometric mean aerobic plate counts per gram (and number of units examined) were as follows: fish sticks, 8,300 (1,539); fish cakes, 5,600 (1,378); crab cakes, 4,900 (1,226); scallops, 1,700 (1,392); clams, 450 (1,384); haddock, 15,000 (1,306); fish in fish and chips dinner, 7,200 (1,485); and uncooked shrimp, 220,000 (1,462). Geometric mean coliform, Escherichia coli, and Staphylococcus aureus counts for all eight products ranged from 1 to 10/g.
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ABSTRACT: Microorganisms associated withPacific shrimp (Pandalus jordani) wereiso- lated andidentified. Thoseontheicedrawshrimp, whichyielded anaverage countof1.6x 106, werepredominantly Moraxella, Pseudomonas, Acinetobac- ter, Arthrobacter, andFlavobacterium-Cytophaga spp.Theblanching andpeel- ingreduced themicrobial level to3.3x 104andalsoselectively eliminated Moraxella spp.Themicrobial flora changed after eachprocessing sequence, and theheatsensitivity andgrowth characteristics oftherepresentative microbial groups suggested thatthepresence ofArthrobacter andAcinetobacter spp.in peeled shrimpmayindicate inadequate cleaning ofrawshrimporashorter blanching time. Thepresence ofMoraxella andFlavobacterium-Cytophaga spp. wouldindicate thedegree ofsecondary contamination, andthepresence of Pseudomonas spp.wouldindicate theshelf-age oftheprocessed shrimp. Since we madeamicrobiological surveyof Pacific shrimp(Pandalus jordani) processing inOregoninthelate1960s(6), twoimportant changes havetakenplace. Theshrimp landings nowhavequadrupled toover20million pounds perannum,andnearly alllanded shrimp are peeled bytheLaithram modelPCA machine (Laithram Co.,NewOrleans, La.). Although theshrimp arestill harvested from thesamebed,at60to90fathoms, 12to15 nautical milesoffshore, thetripnowtakes from2to5daysinstead ofthe1-day tripthat wascommoninthe1960s. Theshrimp areiced onboardand,withafewexceptions, theentire catch ofatrip isheldinacommonhold. The ageoftheshrimp uponlanding, therefore, may rangefromlessthan1dayto4 daysoutof water. Uponlanding, theshrimp maybeheldonice foranadditional dayorimmediately washed free fromiceandprocessed. Therawshrimp are transported toaholding tankandaresteam- blanched at100°C (212°F) for2to3min.Peeling isaccomplished byreciprocating rubber rollers, themeatandshell areseparated bydensity differential underrunning water,andthe peeled shrimp arehand-sorted, brined, packed in5-lb (no.10;about2,267.5 g)cans, andfrozen. Inthis study, weexamined therawshrimp to assess theeffect ofthechanges inharvesting practice onthemicrobial quality. Thepeeled shrimp wereexamined todetermine theimpact ITechnical paperno.4403oftheOregon Agricultural Experiment Station. ofthemechanical peeling, andtheindividual processing methodwasstudied toevaluate the overall microbial quality oftheshrimpasitis currently being processed. Attempts werealsomadetodetermine the causeofthemicrobial quality difference by identifying themicrobial population tothege- nuslevel andexamining thelow-temperature growth andheatinactivation characteristics of themajormicrobial groups.
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ABSTRACT: The microbiological quality of frozen raw and cooked shrimps destined for import and export was determined. The total number of frozen shrimp samples tested were 657 comprising 54 (FW) freshwater shell-on, 29 freshwater peeled deveined, 123 seawater (SW) shell-on, 410 seawater peeled deveined, and 41 seawater cooked. The geometric means for APC g−1, coliform counts (MPN g−1) and E. coli counts (MPN g−1) were, respectively, FW shell-on, 890 000, 82 and 14; FW peeled deveined, 430 000, 16 and 5; SW shell-on, 310 000, 10 and 3; SW peeled deveined, 410 000, 9 and 3 and seawater cooked 7000, 4 and 3. 653 (99%) of the samples had S. aureus counts of less than 50 MPN g−1. Shigella and Vibrio cholerae were not detected and Salmonella was positive for 3 (0·5%) of the 657 samples tested.Food Microbiology 07/1987; 4(3):221-228. DOI:10.1016/0740-0020(87)90004-9 · 3.37 Impact Factor
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ABSTRACT: Microorganisms associated with Pacific shrimp (Pandalus jordani) were isolated and identified. Those on the iced raw shrimp, which yielded an average count of 1.6 x 10(6), were predominantly Moraxella, Pseudomonas, Acinetobacter, Arthrobacter, and Flavobacterium-Cytophaga spp. The blanching and peeling reduced the microbial level to 3.3 x 10(4) and also selectively eliminated Moraxella spp. The microbial flora changed after each processing sequence, and the heat sensitivity and growth characteristics of the representative microbial groups suggested that the presence of Arthrobacter and Acinetobacter spp. in peeled shrimp may indicate inadequate cleaning of raw shrimp or a shorter blanching time. The presence of Moraxella and Flavobacterium-Cytophaga spp. would indicate the degree of secondary contamination, and the presence of Pseudomonas spp. would indicate the shelf-age of the processed shrimp.Applied and Environmental Microbiology 05/1977; 33(4):853-9. · 3.95 Impact Factor