DEVELOPMENT OF A NEW FISH REEF UTILIZING BIVALVE ATTACHMENT IN THE UPRIGHT SEAWALL SECTION IN THE AMAGASAKI CANAL

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  • 尼崎運河直立護岸での二枚貝の付着を活用した新たな魚礁の開発

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<p> We developed a fish reef capable of effectively sustaining the function of creating biological habitats over extended periods, even in high-turbidity brackish water dominated by sessile bivalves. These fish reefs were characterized by their simple structure, consisting only of ropes attached to plastic frames. We tested the hypothesis that “the attachment of bivalves to the ropes creates habitats for gobies” in on-side aquarium experiments. We found that (1) the attachment and growth of bivalves on the ropes created rough surfaces and shadows within the fish reef, attracting juvenile Dusky Triple-tooth Gobies Tridentiger obscrus, and (2) the juvenile gobies entered and settled in the internal spaces of the fish reefs. The gobies utilized the rough outer surfaves of the fish reefs, even when the sessile bivalves entirely covered the fish reefs. Furthermore, as the bivalves were detached, the spaces within the fish reef for the gobies to enter were restored.</p>

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