Spawning grounds and reproductive traits of anadromous and resident pond smelt, Hypomesus nipponensis, in Lake Ogawara, Japan

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2 Citations (Scopus)

Abstract

The objective of this study was to reveal the spawning grounds and reproductive characteristics of anadromous and resident pond smelt, Hypomesus nipponensis, coexisting in Lake Ogawara. Life history styles of females shedding in spawning grounds in the lake and its inflowing rivers were differentiated by otolith increment analysis. Size, dry weight, and water content of mature oocytes and fecundity of fish were compared between resident and anadromous fish. Both anadromous and resident fish spawned in the lake. In contrast, no resident fish were found in any of the inflowing rivers, where only anadromous fish spawned. Regression of fecundity against standard length was discontinuous with an inflection point at 63.8 mm, which is the body size that differentiates large anadromous spawning groups from small resident spawning groups. Mean oocyte diameters were not significantly different between resident and anadromous fish. The eggs of resident fish had significantly more water content and a significantly lower dry weight than those of anadromous fish. These differences might influence the growth and developmental processes of progeny.

Original languageEnglish
Pages (from-to)401-407
Number of pages7
JournalFisheries Science
Volume67
Issue number3
DOIs
Publication statusPublished - 2001

Keywords

  • Anadromous
  • Egg size
  • Fecundity
  • Hypomesus nipponensis
  • Otolith
  • Resident
  • Spawning ground

ASJC Scopus subject areas

  • Aquatic Science

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