. The Canadian field-naturalist. 2004 Leslie and Timmins: Age-0 Round Goby in Ontario 319 82"22-W Michigan. Figure 1. Main sites where age-0 Neogobius melanostomus were collected in the St. Clair River-Lake ecosystem in 1994-2000: LGS (Lambton Generating Station) and Duck Creek. Round Goby eggs and age-0 developmental stages as well as numerous co-occuiring fishes were found at various locations at the shore of the St. Clair River, mainly in dilute condenser cooUng water discharge of Lambton Generating Station (LGS) (42°47'N, 82°22'W). Random fish collections took place at LGS (Figure 1)
. The Canadian field-naturalist. 2004 Leslie and Timmins: Age-0 Round Goby in Ontario 319 82"22-W Michigan. Figure 1. Main sites where age-0 Neogobius melanostomus were collected in the St. Clair River-Lake ecosystem in 1994-2000: LGS (Lambton Generating Station) and Duck Creek. Round Goby eggs and age-0 developmental stages as well as numerous co-occuiring fishes were found at various locations at the shore of the St. Clair River, mainly in dilute condenser cooUng water discharge of Lambton Generating Station (LGS) (42°47'N, 82°22'W). Random fish collections took place at LGS (Figure 1) each year between April and November 1994-2000 over a shoreline stabilised with debris, limestone boulders and rocks m in longest dimension. This formation extends 4 m from shore on a natural substrate of sand. Most common fish species collected with age-0 Round Gobies in the St. Clair River include age-0 White Sucker Catostomus com- mersoni, Alewife Alosa pseudoharengus. Brook Silverside Labidesthes sicculus, Rainbow Darter Ethe- ostoma caeruleum, Iowa Darter Etheostoma exile, Johnny Darter Etheostoma nigrum, Spottail Shiner, and Emerald Shiner Notropis atherinoides. Of these species, guarding speleophils Rainbow Darter, Iowa Darter, and Johnny Darter utilise common ecotones and probably compete with gobies for food and shelter. Methods A bulging larval fish beach seine (4 m long, 1 m wide, mesh mm) was necessary for capture of recently hatched gobies, which only emerged from pro- tective crevices when the bottom of the seine dis- turbed the substrate. Two fiat seines, 3 m long, 1 m wide (3 mm mesh), and 6 m long, 1 m wide (6 mm mesh) were used to sample young and adult gobies and co-occurring species. All seine hauls took place repeatedly in contact with gravel at the base of a rail- way bridge over Duck Creek. In the St. Clair River, clusters of eggs attached to rocks or human artefacts such as discarded sewer pipe were preserved intact with 5-10% formalin and
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