February 15-18, 2009 Washington State Convention Center Seattle ...

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EVALUATION OF POTASSIUM PERMANGANATE AGAINST AN EXPERIMENTAL
SUBACUTE INFECTION OF Flavobacterium columnare IN CHANNEL CATFISH, Icatlurus
punctatus
Ahmed M. Darwish*, Andrew J. Mitchell and David L. Straus
Harry K. Dupree-Stuttgart National Aquaculture Research Center
Agricultural Research Service
U.S. Department of Agriculture
Stuttgart, Arkansas 72160 USA
Ahmed.Darwish@ars.usda.gov
The efficacy of potassium permanganate (KMnO 4 ) as a prophylactic and therapeutic treatment for subacute infection of Flavobacterium
columnare was demonstrated in experimentally infected channel catfish, Ictalurus punctatus. Catfish experimentally
infected with F. columnare to mimic a subacute infection, were dosed with KMnO 4 at 2.0 mg/L above the potassium
permanganate demand for 2 h duration.
The survival of the group challenged and simultaneously treated with KMnO 4 (99%) was significantly higher than the positive
control (78%), challenged with F. columnare and not treated, and was not significantly different from the negative control
groups, not challenged. Fish treated with KMnO 4 post-challenge had 7% higher survival than the positive control (85% compared
to 78%) but that difference was not statistically significant. The results demonstrate that KMnO 4 has a clear prophylactic
value but probably a marginal therapeutic value once the infection has established.
BUYER PREFERENCES FOR SMOKED FRESHWATER FISH
Siddhartha Dasgupta*, Steven D. Mims and Jaime Greene
Aquaculture Research Center
Kentucky State University
Frankfort, KY 40601 USA
siddhartha.dasgupta@kysu.edu
Smoked fish is a value-added product that could open new markets to Kentucky’s aquaculture industry. This study was based
upon data from a USDA-funded marketing study of smoked freshwater fish. The relevant species used in this study were channel
catfish, hybrid striped bass, and paddlefish. Wholesale buyers, fish retailers, and restaurants were surveyed in Kentucky
and the Great Lakes area to evaluate their perceptions of the three types of smoked fish. Results showed a significant difference
in perceptions based upon the two geographic locations of the respondents. More Great Lakes respondents habitually purchase
smoked fish from individual suppliers, while all smoked fish buyers from Kentucky purchase from wholesale suppliers.
With respect to product ratings, smoked catfish compared poorly to the other products, while hybrid striped bass and paddlefish
were rated relatively highly. Most buyers considered the appearance of whole-smoked paddlefish to be superior to the other
fish types, and they felt that the paddlefish compared well with more traditional smoked fish such as sturgeon.