EFFECT OF THE SHAPE OF SYNTHETIC FIBERS COMPRISED THE SUBSTRATES ON THE HABITAT FOR JAPANESE SPINY LOBSTER

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  • 基質を構成する合成繊維の形状がイセエビ幼生の着生に与える影響

Abstract

<p> The present study aimed to clarify the biofouling, shape, and deterioration of artificial substrates that was used to create a habitat for the Japanese spiny lobster, Panulirus japonicus. Substrates A (0.2 mm width, vinylon), B (1.0 mm width, polypropylene), C (1.6 mm width, nylon), and D (4.8 mm width, polypropylene and polyethylene mixture) were placed off Kiire, Kagoshima, on June 10, 2021. Aquatic organisms that adhered to the substrates were identified on July 1, July 28, October 1, and October 27, 2021. Larvae of P. Japonicus were found on substrates B, C, and D. Further, the aquatic organisms that adhered to substrates A, B, C, and D were mostly shellfish, gammaridean Amphipoda, and caprellids, which are bait for P. Japonicus. The breaking strength of fiber measured by tensile testing decreased by 13.2%, 19.4%, 24.9%, and 6.7% for substrates A, B, C, and D, respectively, after soaking in the sea from June 10 to October 27, 2021. Flume tank experiments revealed that substrate D had the highest ratio of projected area from the upstream to still water (0.97) at a flow speed of 0.1 m/s. The ratio of projected area from the side decreased with increasing flow speed for substrates A, B, and D, whereas there was little change for substrate C.</p>

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