Schematic drawing of the sampling protocols in FLOLIZ and control stations. (A) Fish trap sampling (during night) in FLOLIZ. Black squares symbolize fish traps; (B) Fish trap sampling in NCS and DCS. The white line marks the 0.5 m-deep littoral zone, the red one corresponds to the 1 m-deep one; (C) Visual census (daytime) in FLOLIZ. The dashed grey line with arrow symbolizes the swimming track of each diver; (D) Visual census (daytime) in NCS and DCS.