{"id":9141,"date":"2018-04-17T09:57:52","date_gmt":"2018-04-17T16:57:52","guid":{"rendered":"http:\/\/blogs.oregonstate.edu\/impact\/?p=9141"},"modified":"2018-12-10T11:43:48","modified_gmt":"2018-12-10T19:43:48","slug":"new-research-shows-repeat-spawning-aids-fitness-survival-steelhead","status":"publish","type":"post","link":"https:\/\/dev.blogs.oregonstate.edu\/impact\/2018\/04\/new-research-shows-repeat-spawning-aids-fitness-survival-steelhead\/","title":{"rendered":"Steelhead’s repeat spawning aids fitness and survival"},"content":{"rendered":"

For steelhead trout, reproductive choices represent a collection of tradeoffs \u2013 whether spawning once or doing it multiple times, no decision comes without risks and benefits.<\/p>\n

New research by Michael Blouin<\/a>, professor of integrative biology, and researchers at Purdue University\u00a0shows steelhead that spawn repeatedly have greater than double the lifetime reproductive success of fish that spawn a single time, the benefit for making the daunting journey to sea more than once.<\/p>\n

Findings, which could lead to more effective conservation efforts, were published this week in the Proceedings of the National Academy of Sciences.<\/p>\n

Like salmon, steelhead \u2013 Oncorhynchus mykiss \u2013 are anadromous, meaning they travel to the ocean as smolts and return to their natal streams to spawn; unlike salmon, steelhead are not limited to spawning once and then dying.<\/p>\n

Female steelhead build gravel nests called redds into which they deposit their eggs, and males vie to fertilize them.<\/p>\n

The research by OSU\u2019s Michael Blouin and Purdue\u2019s Mark Christie involved more than 12,000 winter-run steelhead from Oregon\u2019s Hood River, with the researchers looking at number of lifetime spawning events and age at first spawning.<\/p>\n

Read the complete article<\/a>.\u00a0<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Biologist Michael Blouin’s new research\u00a0shows steelhead that spawn repeatedly have more than double the reproductive success of fish that spawn a single time. 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