Population decline off the Japanese sardine <i>Sardinops melanostictus</i> owing to recruitment failures

• Yoshiro Watanabe

• Hiromu Zenitani

• Ryo Kimura

抄録

The Japanese sardine Sardinops melanostictus started to decline after 1989. Recruitment to age 1 population was small in four year-classes from 1988 to 1991. The population decline after 1989 resulted from recruitment failures in 4 consecutive years. Egg production was high in the years of poor recruitment. The recruitment failures were caused not by a reduction in reproductive output but by low survival between egg stage and age 1 recruitment. Abundance of post first-feeding larvae positively correlated with egg and yolksac larval abundance. Mortality at the first-feeding stage was not so variable as to destroy correlations between the abundance of early life stages. The population of age 1 recruits did not correlate with the abundance of post first-feeding larvae. Recruitment of the sardine was not fixed by the end of the first-feeding stage. Cumulative mortality through the early life stages, rather than relatively instantaneous mortality at the first-feeding stage, is thought to be responsible for the recruitment success or failure and eventual population fluctuations of the sardine.

収録刊行物

• Canadian Journal of Fisheries and Aquatic Sciences

  Canadian Journal of Fisheries and Aquatic Sciences 52 (8), 1609-1616, 1995-08-01

  Canadian Science Publishing

キーワード

• Aquatic Science
• Ecology, Evolution, Behavior and Systematics

詳細情報

• CRID: 1364233269517486976
• NII論文ID: 80008683167
• DOI: 10.1139/f95-154
• ISSN: 12057533
• ISSN: 0706652X
• ISSN: http://id.crossref.org/issn/0706652X
• Web Site: http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-154
• データソース種別:
  • Crossref
  • CiNii Articles