Comparison of gut-evacuation rates of feeding and non-feeding Calanus marshallae

1989 ◽  
Vol 103 (2) ◽  
pp. 175-181 ◽  
Author(s):  
S. G. Ellis ◽  
L. F. Small
Keyword(s):  
Gut Evacuation ◽  
Calanus Marshallae

scholarly journals Nutrient sensing; transcriptomic response and regulation of gut motility in an agastric vertebrate

2019 ◽  
Author(s):  
Hoang T. M. D. Le ◽  
Kai K. Lie ◽  
Angela Etayo ◽  
Ivar Rønnestad ◽  
Øystein Sæle
Keyword(s):  
Digestive Tract ◽  
Genetic Regulation ◽  
Nutrient Sensing ◽  
Transcriptomic Response ◽  
Gut Motility ◽  
Gut Evacuation ◽  
Vitro Model ◽  
Transcriptomic Changes ◽  
Upregulated Genes

AbstractThe transcriptome of nutrient sensing and the regulation of gut motility by nutrients in a stomachless fish with a short digestive tract; the ballan wrasse (Labrus berggylta) were investigated. Using an in vitro model, we differentiate how signals initiated by physical stretch and nutrients modulate the gut evacuation rate and motility patterns, and transcriptomic changes. Stretch on the intestine by inert cellulose initiated fast evacuation out of the anterior intestine compared to the digestible protein and lipid. Stretch on the intestine upregulated genes associated with increased muscle activity, whereas nutrients stimulated pathways related to ribosomal activity and the increase in the expression of several neuropeptides which are directly involved in gut motility regulation. Our findings show that physical pressure in the intestine initiate contractions propelling the matter towards the exit, whereas the sensing of nutrients modulates the motility to prolong the residence of digesta in the digestive tract for optimal digestion.Summary statementPressure by food speed up peristalsis in the intestine, but the intestines ability to sense nutrients slow down peristalsis for better digestion. This is partly controlled by genetic regulation.

Feeding and gut evacuation of cultured juvenile spiny lobsters, Jasus edwardsii

Aquaculture ◽  
2008 ◽  
Vol 280 (1-4) ◽  
pp. 211-219 ◽  
Author(s):  
Cedric J. Simon ◽  
Andrew Jeffs
Keyword(s):  
Jasus Edwardsii ◽  
Spiny Lobsters ◽  
Gut Evacuation

scholarly journals Mate-finding behaviour in Calanus marshallae Frost

1998 ◽  
Vol 353 (1369) ◽  
pp. 713-720 ◽  
Author(s):  
Atsushi Tsuda ◽  
Charles B. Miller
Keyword(s):  
Initial Contact ◽  
Mate Finding ◽  
Pheromone Trails ◽  
Spermatophore Transfer ◽  
Calanus Marshallae ◽  
Pheromone Trail

Mate-finding behaviour by Calanus marshallae Frost, 1974, was observed and video recorded in a 1 m diameter kreisel. Newly moulted females signal to males by depositing vertical pheromone trails many tens of centimetres long. Males search for trails along primarily horizontal trajectories. The orthogonality of signal trace and search trail trajectory maximizes the chance of intersection. Males often initiate a dance of rapid, tight turns upon encountering a pheromone trail, then waggle down it (chase swimming) to the signalling female. She jumps away after initial contact, and the male follows. Many successive approach, bump and jump sequences follow, with mating eventually ensuing. The actual copulatory clasp and spermatophore transfer were not observed, although a few instances of brief attachment and tandem swimming were seen. Male dances occur at times when chase swimming does not follow, and the function of dances is not yet known.

Laboratory investigation of daily food intake and gut evacuation in larvae of African catfish Clarias gariepinus under different feeding conditions

2008 ◽  
Vol 18 (2) ◽  
pp. 119-134 ◽  
Author(s):  
Armando García-Ortega ◽  
Johan Verreth ◽  
Karen Vermis ◽  
Hans J. Nelis ◽  
Patrick Sorgeloos ◽  
...  
Keyword(s):  
Food Intake ◽  
Laboratory Investigation ◽  
Clarias Gariepinus ◽  
African Catfish ◽  
Daily Food Intake ◽  
Daily Food ◽  
Gut Evacuation

Effects of hypoxia on oxygen consumption, swimming velocity and gut evacuation in southern bluefin tuna (Thunnus maccoyii)

2010 ◽  
Vol 89 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Quinn P. Fitzgibbon ◽  
Roger S. Seymour ◽  
Jeffery Buchanan ◽  
Richard Musgrove ◽  
John Carragher
Keyword(s):  
Oxygen Consumption ◽  
Bluefin Tuna ◽  
Swimming Velocity ◽  
Southern Bluefin Tuna ◽  
Gut Evacuation
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