Investigating ecosystem processes using targeted fisheries closures: Can small-bodied invertivore fish be used as indicators for the effects of western rock lobster fishing?
MetadataShow full item record
Ecosystem modelling has predicted that fishing for western rock lobster Panulirus cygnus in deep water (50–80 m) habitats will result in increased abundance of their macroinvertebrate prey, which would, in turn, support greater production of small-bodied invertivore fish species. To investigate the potential ecosystem effects of rock lobster fishing, a targeted fisheries closure was proposed in deep water habitats along the coast of Western Australia. Data on small-bodied invertivore fish abundance, from baited video, were used to investigate differences across habitats and simulate the likely power of any study to detect change. In general, small-bodied invertivore fish were more abundant at shallower macroalgae-dominated sites, whereas the most abundant single species, the western king wrasse Coris auricularis, was abundant across all habitats and sites. Power simulation of a mixed-model before–after–control–impact (BACI) design found that a 40–50% decrease in either Coris auricularis or small-bodied invertivore fish in general would be very likely to be detected (power ,0.8). Based on the power simulation, we suggest a general sampling design to investigate change before and after the establishment of the fishery closure and make suggestions for further ecological studies to investigate the predicted ecosystem effects of rock lobster fishing.
Showing items related by title, author, creator and subject.
Coghlan, A.; McLean, D.; Harvey, Euan; Langlois, T. (2017)© 2017 Elsevier B.V. Baited remote underwater stereo-video systems (stereo-BRUVs) are commonly used to sample fish assemblages across areas of differing fish densities with little consideration of how intraspecific and ...
A small no-take marine sanctuary provides consistent protection for small-bodied by-catch species, but not for large-bodied, high-risk speciesMcLean, B.; Langlois, T.; Harvey, Euan; Shortland-Jones, H.; Stevens, R. (2015)Despite calls for networks of no-take sanctuary zones of ‘moderate size’ (10–100 km2) to meet both conservation and resource management objectives, there have been a plethora of small (1–5 km2) and very small (< 1 km2) ...
Strong direct and inconsistent indirect effects of fishing found using stereo-video: Testing indicators from fisheries closuresLanglois, T.; Harvey, Euan; Meeuwig, J. (2012)Candidate indicators of the direct and indirect effects of fishing can be developed by investigating fisheries closures. We tested a suite of such indicators in areas open to fishing but with suspected differences in ...