| Summary: | Experiments were conducted to study the habit at selection of juvenile cod Gadus morhua, juvenile whiting merlangus merlangius, black goby Gobius niger, great pipefish Syngnathus acus, sand eel Ammodytes tobianus, butterfish Pholis gunnellus, three-spined stickleback Gasterosteus acculeatus, sea stickleback Spinachia spinachia, goldsinny Ctenolabrus rupestris, and flounder Plathichthys flesus. Aquaria with compartments with algae, with sand and with no substratum were used. Cod, whiting and great pipefish preferred the empty compartments followed by the compartments with sand. For the other species no significant differences were observed althouqh butterfish, three-spined stickleback, and sea stickleback were most frequently found in compartments with algae, and black goby and sand eel were most frequently found in the compartments with sand. The experiments also showed that cod and whiting had a significant attraction to each other.
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