The on-shore fish market at Seeb is one of the largest fish landing areas in the Muscat region of Oman. Fish buyers at this on-shore fish market suggest that prices are higher on weekend days {Thursday and Friday) than they are during the rest of the week. The study reported here is one to test the hypothesis of higher prices on weekend days of six species of fish at the on-shore market at Seeb. The analysis used graphical and statistical methods. The graphical analysis used simple average prices as well as simple averaged prices and quantities relatives to identify short term daily price variations. The statistical analysis utilized linear regression models to identify price differentials between weekend days and weekdays. The results indicate that positive price differentials between weekend days and weekdays are statistically significant for King Fish, Yellow Fin Tuna, Long Tail Tuna and Squid. There was not a statistically significant difference in the daily prices for Silver Grunt and Sardines. The results revealed most of the price differences occurred on Thursday, which is a food major shopping day for the area.