title: [Dietary composition and food competition of six main fish species in rocky reef habitat off Gouqi Island].
abstract: Based on the monthly investigation data of fish resources in the rocky reef habitat off Gouqi Island from March 2009 to February 2010, this paper studied the dietary composition of three native fish species (Sebasticus marmoratus, Hexagrammos otakii and Hexagrammos agrammus) and three non-native fish species (Lateolabrax japonica, Nibea albiflora and Larimichthys polyactis). The analysis of gut content indicated that the main prey items of these six dominant fish species were Caprellidae, Gammaridea, juvenile S. marmoratus, Engraulis japonicas and Acetes chinensis and the dietary composition of each of the 6 fish species had obvious seasonal variation. There was an intense food competition between native species H. otakii and H. agrammus in autumn, between non-native species N. albiflora and L. polyactis in summer, between non-native species N. albiflora and native species S. marmoratus in autumn, and between non-native species N. albiflora and native species H. otakii in winter. It was suggested the non-native species N. albiflora was the key species in the food competition among the six dominant fish species in this rocky reef habitat, and thus the feeding behaviors of these six fish species could have definite effects on the resource capacity of juvenile S. marmoratus.
authors.affiliation: College of Marine Science, Shanghai Ocean University, Shanghai 201306, China. wangk98@163.com
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.forename: Shou-Yu
authors.initials: SY
authors.lastname: Zhang
authors.forename: Zhen-Hua
authors.initials: ZH
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.forename: Min
authors.initials: M
authors.lastname: Xu
authors.forename: Jun
authors.initials: J
authors.lastname: Lin
mesh_terms: D000818:Animals; D002681:China; D003163:Competitive Behavior / Q000502:physiology*; D004032:Diet; D017753:Ecosystem; D005247:Feeding Behavior / Q000502:physiology*; D005399:Fishes / Q000254:growth & development* / Q000502:physiology*; D020387:Food Chain; D009792:Oceans and Seas; D012621:Seasons