Changes in smolt timing and age at maturity caused by crossbreeding wild- and hatchery-reared masu salmon

DOI Web Site 12 References

Bibliographic Information

Other Title
  • ヤマメ養殖魚との交雑によるサクラマスのスモルト時期および成熟年齢の変化

Abstract

<p>　In Japan, large numbers of hatchery-reared masu salmon Oncorhynchus masou masou are released into rivers for stock enhancement. To evaluate the effects on life history characteristics of hybridization between wild and hatchery-reared fish, we conducted a crossbreeding experiment using wild-origin fish (1st generation in hatchery originating from wild, anadromous fish) and hatchery-reared fish (more than 15 generations in hatchery originating from stream-resident fish that have been crossbred repeatedly with high-growth and early-maturity strains). Hybrid fish (wild-origin female×hatchery-reared male) smolted in March, which was an intermediate timing between that of hatchery-reared fish (December) and wild-origin fish (April). Also, 43.1% of hybrid females at age 1＋exhibited sexual maturity, which was intermediate between hatchery-reared fish (75.7%) and wild-origin fish (6.8%). These results suggest that life history characteristics of local masu salmon populations may be altered by hybridization between wild and hatchery-reared fish.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 89 (1), 49-55, 2023-01-15

    The Japanese Society of Fisheries Science

References(12)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top