Document Type

Article

Department/Program

Biology

Journal Title

Canadian Journal of Fisheries and Aquatic Sciences

Pub Date

9-2-2016

Publisher

Canadian Science Publishing

Volume

74

Issue

4

Journal Article URL

https://www.nrcresearchpress.com/doi/10.1139/cjfas-2016-0197#citart1

First Page

524

Abstract

We show that goldfish (Carassius auratus) voluntarily ingest liquid canola oil at the surface of the water and can swallow significant quantities of oil. The ability of fish to separate floating oil from water has not been tested previously, and the mechanisms used to retain oil in the form of suspended droplets, globules, or a surface film are unknown. Chromatograms of fatty acid methyl esters (FAMEs) prepared from gut samples confirmed that goldfish were able to obtain a substantial proportion of their daily lipid intake from canola oil at the surface of laboratory aquaria. Quantification of goldfish suspension-feeding, processing, and spitting behavior suggested that upper jaw protrusion with a closed mouth during processing was important for the handling of different food types, including oil. Crossflow filtration and the generation of vortices could be involved in oil retention by goldfish, as these processes are used industrially to separate oil from water. These results have implications for the uptake of hydrophobic pollutants and dietary lipids at the surface by suspension-feeding fishes.

DOI

https://doi.org/10.1139/cjfas-2016-0197

Publisher Statement

Edwards, K, Rice, Sanderson, S. 2017. Separating oil from water: suspension-feeding goldfish ingest liquid vegetable oil. Canadian Journal of Fisheries and Aquatic Sciences. 74. 4: 524-532.

This is the accepted manuscript version of the article.

Share

COinS