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Related Experiment Video

Updated: Mar 9, 2026

Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout Salvelinus namaycush from Its Prey

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Published on: August 29, 2014

Nonnative fish stocking alters stream ecosystem nutrient dynamics.

Alexander V Alexiades¹, Alexander S Flecker², Clifford E Kraft¹

¹Department of Natural Resources, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, 14853, USA.

Ecological Applications : a Publication of the Ecological Society of America

|January 6, 2017

Summary

This summary is machine-generated.

Hatchery-raised trout stocking significantly increases nitrogen supply in streams, meeting up to 85% of nutrient demand. This pulsed nutrient subsidy lasts 6-8 weeks, impacting stream ecosystems.

Keywords:

bottom up conservation fish stocking fishery management nitrogen nonnative species nutrient cycling phosphorus salmonids

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Area of Science:

Ecology
Aquatic Ecology
Fisheries Management

Background:

Millions of hatchery-raised fish are stocked annually worldwide for recreation.
The impact of stocked fish on stream nutrient cycling remains largely unexamined.
Supplemental stocking is a common fisheries management practice with potential ecological consequences.

Purpose of the Study:

To quantify the influence of nonnative fish stocking on in-stream nutrient storage and cycling.
To compare nutrient remineralization and storage by stocked versus native fish.
To assess the impact of stocked fish biomass on nitrogen and phosphorus dynamics.

Main Methods:

Measured biomass, remineralization rates (NH4+-N, SRP), and body nutrient content of stocked and native fish.
Estimated fish growth and nutrient sequestration rates.
Measured ammonium and phosphorus uptake rates to determine fish nutrient influence.

Main Results:

Stocked brown trout provided a substantial source of ammonium-nitrogen (NH4+-N), meeting up to 85% of stream demand.
Stocked trout had minimal impact on soluble reactive phosphorus (SRP) cycles.
The nutrient subsidy from stocked trout persisted for approximately 6-8 weeks post-stocking.

Conclusions:

Supplemental stocking of hatchery-raised fish can provide a significant pulsed nutrient subsidy to stream ecosystems.
High stocking densities of nonnative trout can alter nitrogen dynamics.
Understanding the temporal effects of stocking is crucial for assessing its ecological impact.