Habitat use in irrigation channels by the golden venus chub (hemigrammocypris rasborella) at different growth stages

Norio Onikura, Jun Nakajima, Hiromi Kouno, Yoshiko Sugimoto, Jun Kaneto

研究成果: Contribution to journalArticle査読

17 被引用数 (Scopus)

抄録

Ecological information on the golden venus chub (Hemigrammocypris rasborella Fowler, 1910) was collected during field surveys and used to analyze habitat use by this species at each growth stage. Surveys were conducted every month for approximately 2 years in an irrigation ditch near the Ushizu River, Kyushu Island, Japan. Based on the characteristic nuptial coloration of males, it was estimated that H. rasborella spawns between spring and summer. Size measurements of 2697 individuals indicated two size classes. The population of age class 1 decreased rapidly after the spawning period. On the basis of growth patterns, the life cycle of H. rasborella was classified into three stages: the growth stage (GS) of age class 0 fish from August to November, the no-growth stage (NGS) of age class 0 fish from December to March, and the growing and spawning stage (GSS) of age class 0 and 1 fish from April to August. Habitat use by GS, NGS, and GSS fish was analyzed with a stepwise multiple linear regression. The average number of fish was negatively correlated with the presence of a concrete revetment in the GS; positively and negatively correlated with minimum water depth and submerged plants, respectively, in the NGS; and positively correlated with maximum water temperature in the GSS. These results suggest that maintenance of the water level in the fallow season and not using concrete revetments are essential for the conservation of this species under the present conditions in Japanese rice fields.

本文言語英語
ページ(範囲)375-381
ページ数7
ジャーナルZoological science
26
6
DOI
出版ステータス出版済み - 6 1 2009

All Science Journal Classification (ASJC) codes

  • 動物科学および動物学

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