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VacuSIP, an Improved InEx Method for In Situ Measurement of Particulate and Dissolved Compounds Processed by Active Suspension Feeders

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A method to estimate sediment ingestion by fish.

James R Doyle¹, Ahmed M Al-Ansari, Rachelle L Gendron

¹Chemical and Environmental Toxicology Program, University of Ottawa, Canada, Gendron Room 160, 30 Marie Curie, Ottawa, Ontario, Canada K1N 6N5. jamiedoyle@sympatico.ca

Aquatic Toxicology (Amsterdam, Netherlands)

|March 23, 2011

Summary

This summary is machine-generated.

This study introduces a mass balance tracer method using naturally occurring radionuclides to quantify sediment ingestion by benthic fish. Findings reveal significant sediment proportions in fish guts, highlighting its importance in aquatic food webs.

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A Fish-feeding Laboratory Bioassay to Assess the Antipredatory Activity of Secondary Metabolites from the Tissues of Marine Organisms

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Published on: January 11, 2015

Area of Science:

Environmental Science
Ecotoxicology
Aquatic Ecology

Background:

Benthic fish ingest sediment, potentially transferring contaminants through aquatic food webs.
Accurate quantification of sediment ingestion is crucial for ecological risk assessment.

Purpose of the Study:

To propose and validate a mass balance tracer method using radionuclides to estimate sediment ingestion in benthic fish.
To compare this method with the acid insoluble residue (AIR) method for sediment proportion estimation.

Main Methods:

Utilized naturally occurring radionuclides from the (238)U decay series as mass balance tracers.
Analyzed gastrointestinal (GI) tract contents of Shorthead Redhorse Suckers (Moxostoma macrolepidotum).
Compared results from simple and adjusted mass balance tracer methods with the AIR method.

Main Results:

The simple mass balance tracer method estimated mean sediment proportion at 46% (±16%) of GI tract dry weight.
The adjusted mass balance tracer method yielded a mean sediment proportion of 38% (±13%).
The AIR method estimated a mean sediment proportion of 30% (±16%).

Conclusions:

Direct sediment ingestion by benthic fish is a significant pathway for contaminant transfer.
The radionuclide mass balance tracer method provides a robust estimation of sediment ingestion.
This method aids in understanding contaminant bioaccumulation in aquatic ecosystems.