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Transcriptomic response to aquaculture intensification in Nile tilapia
- Source :
- Evolutionary Applications, Evolutionary applications, Evolutionary Applications, Vol 12, Iss 9, Pp 1757-1771 (2019)
- Publication Year :
- 2019
- Publisher :
- John Wiley and Sons Inc., 2019.
-
Abstract
- To meet future global demand for fish protein, more fish will need to be farmed using fewer resources, and this will require the selection of nonaggressive individuals that perform well at high densities. Yet, the genetic changes underlying loss of aggression and adaptation to crowding during aquaculture intensification are largely unknown. We examined the transcriptomic response to aggression and crowding in Nile tilapia, one of the oldest and most widespread farmed fish, whose social structure shifts from social hierarchies to shoaling with increasing density. A mirror test was used to quantify aggression and skin darkening (a proxy for stress) of fish reared at low and high densities, and gene expression in the hypothalamus was analysed among the most and least aggressive fish at each density. Fish reared at high density were darker, had larger brains, were less active and less aggressive than those reared at low density and had differentially expressed genes consistent with a reactive stress-coping style and activation of the hypothalamus-pituitary-interrenal (HPI) axis. Differences in gene expression among aggressive fish were accounted for by density and the interaction between density and aggression levels, whereas for nonaggressive fish differences in gene expression were associated with individual variation in skin brightness and social stress. Thus, the response to crowding in Nile tilapia is context dependent and involves different neuroendocrine pathways, depending on social status. Knowledge of genes associated with the response to crowding may pave the way for more efficient fish domestication, based on the selection of nonaggressive individuals with increasing tolerance to chronic stress necessary for aquaculture intensification.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Fish farming
lcsh:Evolution
Zoology
Biology
010603 evolutionary biology
01 natural sciences
03 medical and health sciences
Nile tilapia
Aquaculture
HPI axis
Genetics
medicine
lcsh:QH359-425
Chronic stress
Domestication
Ecology, Evolution, Behavior and Systematics
Social stress
Aggression
business.industry
aggression
Original Articles
aquaculture intensification
stress response
biology.organism_classification
Crowding
crowding
030104 developmental biology
fish domestication
gene expression
Original Article
medicine.symptom
General Agricultural and Biological Sciences
business
Subjects
Details
- Language :
- English
- ISSN :
- 17524571
- Volume :
- 12
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Evolutionary Applications
- Accession number :
- edsair.doi.dedup.....43609f1253b8209227f53e04db4f3b5d