Abstract
The daily variation in planktonic numbers of mature and juvenile Lucifer faxoni Borradaile has been determined for two neritic locations in the northern Gulf of Mexico. The planktonic numbers are apparently related to both solar and tidal cycles. There are more Lucifer in the sampled water column during the night than during the day and more during the flooding tide than during the ebbing tide. The flood to ebb ratios are higher than the nocturnal to diurnal ratios at both locations. It is suggested that the daily vertical migration of Lucifer at these locations is being modified to achieve landward transport by the tendency of Lucifer to swim up into, or remain up in, the water column during a flooding tide and to drop out of the water column during an ebbing tide.
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