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The spatial vanabllity in population structure of the shore crab Carcinus maenas was studied In a shallo\v-water fiord in the lsland of Fyn, Denmark The fjord compnses an enclosed area whlch is geomorphologically divlded into a shallo~v cove (mean depth 2 m) , known as Keitinge Nor, and a deeper narrow area closer to the open sea, known as Kerteminde Fjord Tidal range IS small (ca 20 cm) Sex-ratio favoured males at most of the sltes sampled wlth the exception of the inland slope between the shallow Kertinge Nor and the deeper Kerteminde Fjord whlch apparently was a spawnIng site Crab denslties were much higher in Kertemlnde Fjord than In the shallower Kertinge Nor Ventral carapace colour varled between green and orange-red with the proport~on of the green morphotype Increasing wlth increasing distance from the open sea Analysls of the population slze structure ldentlfied 3 differentiated areas for both male and female crabs Sltes closer to the mouth of the fjord were charactenzed by a numerical dominance of small crabs, whereas crabs in Kertinge Nor were clearly of a much larger size Sltes In Kerteminde Fiord were characterized by a wider range of slzes Some crabs in Kerteminde Fjord carried epiblonts on the carapace, but those were absent in crabs from lceltinge Nor, moreover, a few crabs In Kertinge Nor carried Myt~ lus eduhs byssus threads indicating that epibionts had fallen from the carapace5 Thus, population structure cha~acterlstlcs such as colour morphotype proportions, size structure and occurrence of eplbionts are In accordance wlth the occurrence of a hlgh degree of environmental vanability In the area decreasing towards the mouth of the fjord and the open sea

Spatial variability in the population structure of the shore crab Carcinus maenas (Crustacea:Brachyura) in a shallow-water, weakly tidal fjord