On the Fish Gathering Effect of the Artificial Reefs Ascertained by the Diving Observation -XIX : At the Reefs Offshore of Tanegashima, Kagoshima Prefecture

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Five artificial reef sites in the vicinity of Tanegashima were investigated through underwater observation, as to the degree of shoaling, scouring, general condition, and fish gathering patterns. These reefs were located in relatively shallow sandy bottom areas, at depths from 12-28m. The reefs are generally of a single layer construction, with the blocks concentrated into an area with a maximum height of only 3m. The shallow reefs are generally subject to shoaling effects. Regions with sea beds showing sediment transport ripples have the highest shoaling effect. A maximum shoaling rate of 8-9cm/year was calculated for the reefs. Due to the shallow nature of these reefs, schools of the following larval fishes were observed in the shadow of the reefs: Spratelloides japonicus (banded blue sprat), Apogon semilineatus (bottom perch), Trachurus japonicus (Japanese horse mackerel), Scomber japonicus (mackerel), and Lutjanus vitta (brown striped snapper). Larger fish included Oplegnathus fasciatus (striped beak-perch), Plectorhynchus pictus (painted sweetlip), and Prionurus microlepidotus (surgeon fish), but in limited numbers. In order to form a productive reef, it seems necessary to build a reef in one to two piles, each of a 2-3 peaked type, and of a maximum height.

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