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Sampling and Identification of Microplastics in Groundwater
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Hudson River juvenile Blueback herring avoid ingesting microplastics.

M Gray Ryan1, Lisa Watkins1, M Todd Walter1

  • 1Soil and Water Lab, Dept. of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA.

Marine Pollution Bulletin
|August 21, 2019
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Summary
This summary is machine-generated.

Juvenile fish in the Hudson River selectively avoid microplastics, preferring zooplankton. Microplastic ingestion did not correlate with fish health, but further research is needed.

Keywords:
Blueback herringCoefficient of conditionHudson RiverJacob's modified electivity indexMicroplastics

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Area of Science:

  • Environmental toxicology
  • Marine biology
  • Ecotoxicology

Background:

  • Microplastic pollution is a global concern, particularly in aquatic ecosystems.
  • Microplastics pose a threat to aquatic organisms, especially when similar in size to zooplankton, a primary food source for fish.
  • The selective feeding behavior of fish regarding microplastics and the impact on their health remain unclear.

Purpose of the Study:

  • To determine the degree of selective feeding on microplastics by juvenile fish.
  • To assess the relationship between microplastic ingestion and fish condition.
  • To investigate microplastic presence in the diets of fish from the Hudson River.

Main Methods:

  • Analysis of gut contents from juvenile fish collected in the Hudson River.
  • Quantification of microplastics and zooplankton in the water column and fish diets.
  • Application of Jacob's Modified Electivity (JME) to assess feeding selectivity.

Main Results:

  • Microplastics constituted 12% of fish diets, while comprising 21% of particles in the water column (0.335-5.0 mm).
  • Fish demonstrated selective feeding, favoring zooplankton and actively avoiding microplastic particles.
  • No significant correlation was found between fish condition and their selectivity towards zooplankton or microplastics.

Conclusions:

  • Juvenile fish exhibit avoidance behavior towards microplastics when zooplankton is available.
  • Microplastic ingestion, at the levels observed, did not appear to affect the physical condition of the studied fish.
  • Further research should explore diverse feeding strategies, bioaccumulation, and broader spatial/temporal scales for microplastic selectivity in fish.