ダイバ-との比較からみた魚礁での無人機の魚類観察能力について

概要

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Recently underwater observations have begun with small ROVs (Remotely operated vehicle) to observe marine biological resources. The ROV has several advantages compared to diver, because of less limits of observation time and working depth. ROVs are expected to be a good method for biological study around artificial fish reefs. The ability of small observation ROV and divers to distinguish fishes were compared at four characteristic bottom sites. As the result, the ability of ROV was not good enough at the bad visibility areas where young fishes inhabited, but was good at flat bottom areas and relatively good at the artificial reef. In regard to the number of fish species found at the artificial fish reefs settled at a depth of 30m, results of 20 min observations by two divers were superior to those of 360 min ROV observations. When using the ROV for the fishery research in artificial fish reef grounds, the results obtainable are unsuitable to quantitative analysis and extreme care must also be taken not so as to stragle the ROV's cable with fish reefs.
日本水産學會の論文