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We describe the patterns of spatial distribution and behaviour of an intertidal fishassemblage on a rocky intertidal platform in the south of Portugal during high tide. Data were collectedby surveying a number of predefined transects and focal observations of individual fish. Severalinterspecific differences, in both zonation and substratum, were found at high tide that were notapparent in observations of pools at low tide. Parablennius sanguinolentus occurred mainly on bouldersat the high intertidal, Lipophrys pholis and Coryphoblennius galerita were especially abundantin the upper intertidal. L. canevae and L. trigloides were most abundant in the low intertidal, with L.canevae being restricted to that level. Gobius cobitis used all shore levels, including a significantpresence in the subtidal. Species typically considered subtidal, like P. pilicornis and P. gattorugine,were found also in the intertidal at high tide. In the case of P. gattorugine both juveniles and evenlarge adults moved up with the tide, reaching the highest shore levels. C. galerita seemed to berestricted to the vicinity of its low-tide shelters, around crevices and pools, while large specimens ofL. pholis and G. cobitis were subject to larger displacements, up and down with the tide. Apart fromthe benthic component, the fish assemblage is enriched at high tide by a large number of fish, mainlyjuveniles of pelagic and bentho-pelagic species, meaning that the rocky intertidal may play a nurseryrole for several non-resident fish species

Patterns of spatial distribution and behaviour of fish on a rocky intertidal platform at high tide