When ACAP Saint John set out on a four-year study of fish life and water quality in the Saint John Harbour, the environmental group wasn't setting out to answer any big questions. The study, which began in 2018, was designed to set a baseline for the general health of fish populations in the harbour. No one had made an effort to see how many species of aquatic life were in the tidal waters of the harbour, and in what numbers. Roxanne MacKinnon, the executive director of ACAP, said they were surprised by what they found.