Document Type

Article

Department/Program

Biology

Journal Title

Journal of Fish Biology

Pub Date

3-23-2015

Publisher

Wiley

Volume

86

Issue

5

Journal Article URL

https://onlinelibrary.wiley.com/doi/full/10.1111/jfb.12656

First Page

1457

Abstract

This study developed and applied an approach to calculate the proportion of fish gut content composed of mucus secreted by the oropharyngeal cavity and gut. The amount of nitrogen in the contents of the foregut (oesophagus and gizzard) and the epibranchial organs of suspension‐feeding American gizzard shad Dorosoma cepedianum was significantly higher than the nitrogen in the homogeneous food source. Using data collected from suspension‐feeding experiments and the nitrogen content of D. cepedianum mucus, a series of equations illustrated that mucus constituted c. 10% of D. cepedianum foregut content and 12% of epibranchial organ content by dry mass. Future quantification of fish feeding selectivity and absorption efficiency can use this approach to take into account the contribution of fish mucus to the nutrients in the gut contents. This study supports the conclusion that suspension‐feeding D. cepedianum in a heterogeneous environment selectively ingest nutrient‐rich particles, even when gut nutrient content is adjusted to take into account the contribution of mucus.

DOI

https://doi.org/10.1111/jfb.12656

Publisher Statement

This is the accepted manuscript version of the article.

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