For sustainable aquaculture, the removal of marine resource ingredients in fish diets is an important objective. While most studies focus on the replacement of fish oil by vegetable oil, little is known on the nutritional effects of presence (which corresponds to the control diet) or absence of dietary fish oil. We studied fatty acid composition of brush-border membranes and digestive enzyme ac...

Ingested pollutants may elicit digestive toxicity following incorporation into consumer tissues. This post-assimilatory toxicity may include tissue damage influencing synthesis of digestive enzymes, gut transit time and absorption of nutrients as well as pollutants by the gut epithelium. This study investigated impacts of chronic field exposure on gut residence time (GRT), feces elimination rat...

What is the composition of snake venom?  Snake venom is a cocktail of several different proteins and enzymes  Protein constitute 90% of dry weight of venoms o Proteins include Lethal Polypeptides and Hydrolytic enzymes (Proteases, Nucleases, Peptidases, Lipases, etc) that can either enhance and/or contribute to the toxic effect of the venom o Enzymes cause both local and systemic destruction ...

THE most recent account of the digestive processes of the cockroach is that given by Swingle [1925], who employed the Common Cockroach (Blatta orientalis) in his experiments and whose conclusions are briefly as follows. The salivary glands produce only an amylase. The hepatic caeca of the midgut produce an invertase, maltase, lipase and protease. The remainder of the mid-gut (stomach) secretes ...

Résumé Le Moullac G., A. Van Wormhoudt, AQUACOP. Aquat. Living Resour., 1994, 7 , 203-210. Activity of digestive enzymes (trypsin, chymotrypsin and amylase) was studied in relation with food in Penaeus vannamei larvae first stages. Microparticles containing casein involved the decrease of soluble protein content and enzyme activities. Specific trypsin activity but not chymotrypsin was correlate...

Developmental patterns and survival of the cotton bollworm, Helicoverpa armigera Hübner (Lepidoptera: Noctuidae), a polyphagous insect pest, have been studied with reference to the effect of diet on major gut digestive enzymes (amylases, proteases, and lipases). Significant correlations between nutritional quality of the diet and larval and pupal mass were observed when H. armigera larvae were ...