Fish Assemblages Associated with Different Artificial Reef Designs on the Great Barrier Reef
DOI:
https://doi.org/10.65869/sar.v5.i2.162Abstract
Artificial reefs have been extensively used to enhance fisheries and restore aquatic habitats. Yet their ecological effectiveness remains highly variable and appears strongly dependent on design and/or configuration. To evaluate the influence of reef architecture on fish assemblages on the Great Barrier Reef, this study examined four artificial reef types: Reef Ball, Broken Concrete, Layer Cake, and SynCoral, in contrast to sand control sites. The study employed underwater visual census to characterise fish communities, followed by an analysis of community metrics, such as abundance and biomass, in relation to structural parameters, including surface area, rugosity, enclosed volume, and refuge characteristics. Results indicated that fish communities differed significantly among reef types, with artificial reefs consistently supporting greater fish abundance and biomass than the control sites. Simple measures of gross volume were poor predictors of ecological performance. Instead, habitat complexity variables, particularly site surface area, rugosity, and refuge volume, were most strongly associated with fish abundance and estimated biomass, with non-linear relationships explaining a substantial proportion of variance in biological responses. Reef configurations with higher structural heterogeneity (e.g., SynCoral and Layer Cake) generally supported greater fish abundance than simpler designs. Size-class analyses suggested that both recruitment and redistribution processes contributed to observed assemblages. However, a clear separation between production and attraction mechanisms could not be established over the study period. While artificial reefs increased local fish abundance and biomass relative to simpler sand habitats, evidence for a net increase in system-wide carrying capacity remained inconclusive. Overall, the findings demonstrate that artificial reef performance is primarily driven by structural complexity rather than total volume, highlighting the importance of refuge diversity and habitat heterogeneity in reef design. These results support a shift toward complexity-based design principles in artificial reef construction to enhance ecological outcomes.
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