Effects of Position in the Water Column, Vertical Movement and Shade on Settlement of Fish to Artificial Habitats
Abstract:We examined whether the abundance and diversity of recently settled fish associated with artificial habitats varied with the position of the habitat in the water column (surface versus seafloor), its vertical movement (moving vertically with the tide versus stationary), and whether it was shaded. The total abundance of recently settled fish did not vary due to position or movement in an experiment designed to test for the effects of these two factors. However, in a second experiment that tested for both shading and movement, significantly greater numbers of fish settled to shaded habitats that were stationary. The number of species of settlers did not vary significantly due to position. movement or shade in either experiment. However, the abundance of several species varied significantly with at least one of these factors, suggesting that habitat may be provided for a greater number of species if artificial structures are installed under a wide range of conditions. Extra habitat will be of most benefit where there is a good supply of competent larvae and where habitat is limited.
Document Type: Research Article
Publication date: 1994-09-01
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