2011 Fiscal Year Final Research Report
Population stagnant growth caused by cryptic species of Brachionus plicatilis species complex
| Project/Area Number |
22780182
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
General fisheries
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| Research Institution | Kitasato University |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2011
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| Keywords | シオミズツボワムシ / 初期餌料 / 隠蔽種 |
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| Research Abstract |
Rotifer Brachionus plicatilis has been an indispensable zooplankton as a live-food in aquaculture since 1960s. Three types of L, S and SS have been recognized based on their body size, but recent studies revealed that B. plicatilis consists of genetically-isolated species/strains, called species complex. Based on substitutions in the COI locus, the specimens examined in this study were classified into 5 genetically-isolated strains. Subsequently, the two strains of the L-type, Amami and Obama strain, were further investigated to compare their life-history parameters. The Amami strain showed relatively faster growth and maturation, but had lower stavation resistance than the Obama strain. These differences in their life-history suggested that the Amami and Obama strains could be considered to be r-and K-strategists, respectively. Such different adaptive behaviors between the two strains can cause the competition in the mass-culture, and resulted in the stagnant growth or even collapse of the population.
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[Journal Article] Genetic identification and morphology of naturally spawned eggs of the Japanese eel Anguilla japonica collected in the western North Pacific2011
Author(s)
Yoshinaga T, Miller MJ, Yokouchi K, Otake T, Kimura S, Aoyama J, Watanabe S, Shinoda A, Oya M, Miyazaki S, Zenimoto K, Sudo R, Takahashi T, Ahn H, Manabe R, Hagihara S, Morioka H, Itakura H, Machida M, Ban K, Shiozaki M, Ai B, Tsukamoto K
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Journal Title
Fish. Sci
Volume: 77
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Author(s)
Tsukamoto K, Chow S, Otake T, Kurogi H, Mochioka N, Miller MJ, Aoyama J, Kimura S, Watanabe S, Yoshinaga T, Shinoda A, Kuroki M, Oya M, Watanabe T, Hata K, Ijiri S, Kazeto Y, Nomura K, Tanaka H
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Journal Title
Nature Commutions
Volume: 10
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[Journal Article] Evaluation of the larval distribution and migration route of the Japanese eel in the western North Pacific2011
Author(s)
Shinoda A, Aoyama J, Miller MJ, Otake T, Mochioka N, Watanabe S, Minegishi Y, Kuroki M, Yoshinaga T, Yokouchi K, Fukuda N, Sudo R, Hagihara S, Zenimoto K, Suzuki Y, Oya M, Inagaki T, Kimura S, Fukui A, Lee TW, Tsukamoto K
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Journal Title
Rev. Fish Biol. Fisheries
Volume: 21
Pages: 591-611
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