Abstract
In a laboratory study to examine the responses of slimy sculpin Cottus cognatus to chemical cues of brook charr Salvelinus fontinalis eggs, water that held freshly laid eggs (<20 min old), water‐hardened eggs (i.e. eggs >4 h old) or injured eggs was collected and used in a series of two‐choice tests. Slimy sculpin were exposed to paired stimuli of (1) hard egg water v. control water, (2) fresh egg water v. control water, (3) hard egg water v. injured egg water or (4) hard egg water v. fresh egg water. Sculpin spent considerably more time on the side of the tank with hard egg water and fresh egg water v. control water and injured egg water v. hard egg water. Sculpin did not show a preference for hard egg water v. fresh egg water. In a field study, brook charr were attracted to chemical cues from brook charr eggs, suggesting that brook charr eggs produce sufficient odour to attract some species under natural conditions.
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