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Related Experiment Video

Updated: Dec 5, 2025

Effectiveness of the Air Stripping in Two Salmonid Fish, Rainbow Trout Oncorhynchus Mykiss and Brown Trout Salmo Trutta Morpha fario

Effectiveness of the Air Stripping in Two Salmonid Fish, Rainbow Trout Oncorhynchus Mykiss and Brown Trout Salmo Trutta Morpha fario

Published on: September 16, 2018

Captive-bred Atlantic salmon released into the wild have fewer offspring than wild-bred fish and decrease population

Ronan James O'Sullivan^1,2, Tutku Aykanat³, Susan E Johnston⁴

¹School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, Cork, Ireland.

Proceedings. Biological Sciences

|October 21, 2020

Summary

This summary is machine-generated.

Releasing captive-bred fish into the wild significantly reduces their lifetime reproductive success (LRS) compared to wild fish. This negatively impacts overall population productivity, threatening natural fish populations.

Keywords:

Atlantic salmon captive breeding lifetime reproductive success stocking

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Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria

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Published on: July 20, 2017

Area of Science:

Ecology
Conservation Biology
Population Genetics

Background:

Captive breeding programs release numerous fish annually to boost wild populations and angling.
Previous research indicates captive-bred fish underperform in the wild, but lifetime reproductive success (LRS) and population-level impacts are less understood.

Purpose of the Study:

To quantify the individual lifetime reproductive success (LRS) of captive-bred Atlantic salmon compared to wild-bred individuals.
To assess the impact of captive-bred fish on the overall productivity of natural salmon populations.

Main Methods:

Utilized a molecular pedigree to track reproductive success over several decades in a mixed population of wild and captive-bred Atlantic salmon.
Analyzed data from an intensely studied catchment with varying levels of captive-bred fish presence.

Main Results:

Captive-bred Atlantic salmon exhibited, on average, only 36% of the LRS of wild-bred individuals.
A significant LRS deficit persisted even after accounting for individuals that did not spawn, suggesting transgenerational effects.
Years with a higher proportion of captive-bred spawners correlated with lower annual population productivity.

Conclusions:

Captive breeding significantly reduces the reproductive fitness of released fish.
The introduction of captive-bred fish, whether intentional stocking or escapees, can decrease the productivity of wild populations.
Conservation strategies should carefully consider the negative genetic and ecological consequences of releasing captive-bred animals.