The productive and environmental effects of mixed cultivation of noble scallop Chlamys nobilis and macroalga Meristotheca papulosa using suspended aquaculture net cages

The effects of mixed cultivation of noble scallop Chlamys nobilis and macroalga Meristotheca papulosa on their productivity and its potential in restoring eutrophic coastal ecosystems were examined under field and laboratory conditions. From the field, we compared the productivity among three cultiv...

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Published inAquaculture Science Vol. 55; no. 4; pp. 547 - 555
Main Authors Hamaoka, H.(Ehime Univ., Matsuyama (Japan). Center for Marine Environmental Studies), Okuda, N, Omori, K
Format Journal Article
LanguageEnglish
Japanese
Published Japanese Society for Aquaculture Science 20.12.2007
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ISSN0371-4217
2185-0194
DOI10.11233/aquaculturesci1953.55.547

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Summary:The effects of mixed cultivation of noble scallop Chlamys nobilis and macroalga Meristotheca papulosa on their productivity and its potential in restoring eutrophic coastal ecosystems were examined under field and laboratory conditions. From the field, we compared the productivity among three cultivated systems, mono-culture of C. nobilis, mono-culture of M. papulosa, and their mixed culture, in the Uwa Sea. Field results showed the standing crop of M. papulosa was significantly higher in the mixed cultivation than in the mono-cultivation. This result was supported by our laboratory experiments that indicated M. papulosa effectively assimilated ammonia excreted by C. nobilis. Under mixed cultivation in the field, we found no effects of the macroalgal covering on the growth of suspension feeding C. nobilis. Furthermore, the number of barnacles attached to C. nobilis was fewer in the mixed culture than in the mono-culture. These results suggest that the incorporating mixed cultivation of scallops and macroalgae would be more profitable not only due to its higher algal productivity, but also due to lower labor costs in removing barnacles off the shell to improve market value. We finally discuss environmental effects of the mixed cultivation, focusing on increasing water quality and rehabilitation of macroalgal beds in the eutrophicated coastal ecosystems.
Bibliography:P01
2008003640
M12
ISSN:0371-4217
2185-0194
DOI:10.11233/aquaculturesci1953.55.547