Document Detail

Gastric evacuation of the lemon shark Negaprion brevirostris (Poey) under controlled conditions.
MedLine Citation:
PMID:  2920813     Owner:  NLM     Status:  MEDLINE    
Gastric evacuation of the juvenile lemon shark, Negaprion brevirostris, a tropical inshore apex predator, was studied in the laboratory under conditions of 25 degrees C and 32% salinity. Sharks were starved for 48-96 h after which they were fed a 2.7% body weight meal of fish fillet. Gastric evacuation was assessed by stomach lavage every 3 h for 24 h thereafter. Results showed that the gut is emptied in about 24 h with fillets being removed from the stomach following the equation Y = Yoe-bt, where Y is percent of meal recovered at time t, Yo is the initial meal size, and b is the instantaneous rate of evacuation. The exponential function of gastric evacuation in the lemon shark is similar to that in teleosts, but the kinetics are slower. The caloric density of the meal remaining in the stomach increased, approaching that of protein in the first 12 h after feeding, as carbohydrates (glycogen) were digested. After 12 h the caloric value dropped as protein was digested, suggesting an orderly and efficient intake of food energy by the lemon shark.
M E Schurdak; S H Gruber
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Experimental biology     Volume:  48     ISSN:  0176-8638     ISO Abbreviation:  Exp Biol     Publication Date:  1989  
Date Detail:
Created Date:  1989-04-14     Completed Date:  1989-04-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8503247     Medline TA:  Exp Biol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  77-82     Citation Subset:  IM    
Divison of Biology and Living Resources, Rosensteil School of Marine and Atmospheric Science, University of Miami, FL 33149.
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MeSH Terms
Dietary Carbohydrates / metabolism
Dietary Proteins / metabolism
Gastric Emptying*
Gastric Lavage
Models, Biological
Sex Factors
Sharks / metabolism*
Time Factors
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Dietary Proteins

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