長崎県諫早湾のマガキ養殖場に出現する付着汚損生物の種組成と量的変化

概要

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Scallop shells used as test plates were hung from an oyster culture raft in Isahaya Bay, Nagasaki, Japan, for different periods from May/June to November/December each year from 2008 to 2010. Marine organisms that attached to the plates were studied. Twenty-nine species or higher taxonomic categories of fouling organisms were observed, including 2 macroalgal groups (Ceramiales and Ulvales) and 5 invasive species. In general, total wet weights of fouling organisms on 1-month plates increased with increasing water temperature, reaching 45–111 g/100 cm2 in August/September, and decreased after October. Hydroids and ascidians were dominant from May to July, while barnacles became dominant in August/September. Amphibalanus reticulatus and Fistulobalanus kondakovi were dominant in 2008 and 2009, resepectively. In 2010, F. kondakovi and A. amphitrite were the dominant barnacles. On plates immersed for 2 weeks, only barnacles with aperture diameters (AD) smaller than 4 mm were observed from May to July, but the percentage of larger barnacles (AD>4 mm) increased in August and September, indicating that barnacles could reach reproductive maturity within 2 weeks during these periods. Thus, oyster farmers in Isahaya Bay should focus their antifouling measures on the barnacles that become abundant in August and September every year.
日本付着生物学会の論文