Shelter utilization by Gobius cruentatus and Thorogobius ephippiatus (Teleostei: Gobiidae)

Parameters of shelters utilized by Gobiuscruentatus and Thorogobius ephippiatus were measured, in situ, using SCUBA. Both species exhibited non‐random use of shelters, with T. ephippiatus, the smaller of the two species, utilizing significantly larger shelters than G. cruentatus. Interspecific size differences and competitive exclusion are not considered to be of major importance in the observed differential utilization of shelters. The size of shelters utilized by both species is suggested to be influenced by current velocities.