Between April, 1979 and March, 1980, this survey was conducted to gather data for estimation of daily clammer attendance, effort, and catch rate. All data were collected on low tide days (tides of 0.0 or less) on the Morro Bay mud flats. Species composition of catch was recorded, as well as areas of the bay in which catch was taken. Information was obtained by total clammer counts at the time of lowest tide and by interviewing clammers as they left the beds. The days to be sampled were picked at random; four weekdays and four weekend days per month were sampled if tides permitted. Average attendance is estimated at 18.5 ? 4.1 clammers per day, with catch rates of 9.95 clams per hour. Yearly attendance is estimated to be 2,078.5 clammers per day who expend 3,88.3 hours of effort clamming. Fifteen different species were taken by clammers during this period.
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