Abstract
The daily barnacle cyprid attachment, principally Ba-lanus improvisus, and concomitant water temp, and salinity measurements, were recorded continuously during a period of 38 months in Biscayne Bay, Florida. No satisfactory correlations between the frequent peaks in cyprid settling and changes in temp, and salinity were established. However, seasonal periods of heavy cyprid attachment were observed to occur within a temp, range from 18 C to 27 C. A gradual increase in cyprid survival from 1943 to 1945 followed by a sharp decrease was shown by comparison of monthly barnacle collections with monthly totals of daily cyprid attachments. Seasonal variation in growth rates was found to be an important factor in limiting the numbers of barnacles attached per unit area.

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