Mucous contribution to gut nutrient content in American gizzard shad Dorosoma cepedianum.
J Fish Biol
; 86(5): 1457-70, 2015 May.
Article
em En
| MEDLINE
| ID: mdl-25809583
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.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Peixes
/
Ração Animal
/
Muco
/
Nitrogênio
Limite:
Animals
Idioma:
En
Revista:
J Fish Biol
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos