Anadromy and the marine migrations of Pacific salmon and trout: Rounsefell revisited

Anadromy and the marine migrations of Pacific salmon and trout: Rounsefell revisited Anadromy is a defining trait in salmonid fishes but it is expressed to different extents among the species in the family, as reviewed in a classic paper by Rounsefell (1958). The present paper re-examines the subject, assessing the degree of anadromy within the genus Oncorhynchus, using Rounsefell’s six criteria: extent of migrations at sea, duration of stay at sea, state of maturity attained at sea, spawning habits and habitats, post-spawning mortality, and occurrence of freshwater forms of the species. The genus ranges from pink salmon (O. gorbuscha), the most fully anadromous species in the family, to entirely non-anadromous species closely related to rainbow trout (O. mykiss), including Mexican golden trout (O. chrysogaster), Gila and Apache trout (O. gilae), and sub-species of cutthroat trout (O. clarki). This paper provides updated information on anadromy and marine migration patterns, emphasizing the iteroparous species, cutthroat (O. clarki) and rainbow (O. mykiss) trout. These two species display widely ranging patterns of anadromy, including truly “landlocked” populations and residents with easy access to the sea. Anadromous rainbow trout (known as steelhead) populations also vary greatly in their distribution at sea, incidence of repeat spawning, and associated traits. We conclude, as did Rounsefell, that anadromy is not a single trait with two conditions (anadromous or non-anadromous). Rather, it reflects a suite of life history traits that are expressed as points along continua for each species and population. Further research is needed in the marine ecology of all species but especially trout, as they are less well known but apparently more variable in patterns of anadromy and life history than salmon species. Reviews in Fish Biology and Fisheries Springer Journals

Anadromy and the marine migrations of Pacific salmon and trout: Rounsefell revisited

Loading next page...
Kluwer Academic Publishers
Copyright © 2005 by Springer
Life Sciences; Freshwater & Marine Ecology; Zoology
Publisher site
See Article on Publisher Site


You’re reading a free preview. Subscribe to read the entire article.

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches


Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.



billed annually
Start Free Trial

14-day Free Trial