Effect of marine sediment grain-size on the construction of burrow of artificially hatched tilefish fry
2010
Inoue, A., Ishikawa-ken. Fisheries Research Center, Noto (Japan)
The effect of grain-size of marine sediment on the construction of burrow of artificially hatched tilefish Branchiostegus japonicus was studied. Three types of sediment with a different content of silt-clay (7.7, 27.3 and 69.4%) were spread over three test tanks (34.8L) respectively. The fish averaging 97.9 mm total length were placed in the test tanks with 5 fish each, and the number of burrows constructed in 48 hours was counted. The experiment was done six times. In the sediment containing the most silt-clay, the fish constructed the most number of burrows. This result indicates that silt-clay content of sediments is a useful index to select suitable sea area for the release of artificially hatched tilefish.
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