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Density-dependence in post-recruit Japanese seaperch Lateolabrax japonicus in the Chikugo River, Japan

2007; Inter-Research; Volume: 334; Linguagem: Inglês

10.3354/meps334255

1616-1599

Jun Shoji, Masaru Tanaka,

Fish Biology and Ecology Studies

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 334:255-262 (2007) - doi:10.3354/meps334255 Density-dependence in post-recruit Japanese seaperch Lateolabrax japonicus in the Chikugo River, Japan Jun Shoji1,2,*, Masaru Tanaka1 1Laboratory of Estuarine Ecology, Field Science Education and Research Center, Kyoto University, Sakyo, Kyoto 606-8502, Japan 2Present address: Takehara Fisheries Research Station, Center for Education and Research of Field Science, Hiroshima University, Minato-machi 5-8-1, Takehara, Hiroshima 725-0024, Japan *Email: jshoji@hiroshima-u.ac.jp ABSTRACT: Density-dependence in feeding, growth, and mortality was evident in the post-recruit riverine period (15–20 mm in length) of Japanese seaperch Lateolabrax japonicus located within the estuarine turbidity maximum of the Chikugo River, Japan. Based on otolith microstructure analysis, the weight-specific growth coefficient (G, d–1) and abundance-at-age were estimated for post-recruit Japanese seaperch from 1990 to 2000. Abundance at recruitment (15 mm, A15) and at 20 mm (A20), and the mortality coefficient during the post-recruit period (M, d–1) were estimated for each year using the larval production method. The A15 varied by a factor of 24 during the 11 yr period, and its variability had a significant effect on G, M, A20, and the ratio of M to G as an index of Japanese seaperch relative recruitment potential. G was low, and M, ratio of M to G, and A20 were high when recruitment was successful. A lower coefficient of variation (%) was observed in A20 (25.0) than in A15 (33.5) for the 11 yr. A significant effect of A15 was also found on the prey ingestion of the post-recruit Japanese seaperch. Mean gut fullness (gut content weight per unit body weight) was low when recruitment was successful. Density-dependent regulation through competition for prey resources operates on Japanese seaperch in the post-recruit period corresponding with the migration from Ariake Bay to the Chikugo River, a spatially restricted nursery. KEY WORDS: Fish early life stages · Density-dependence · Survival · Estuarine turbidity maximum · Ariake Bay Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 334. Online publication date: March 26, 2007 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2007 Inter-Research.