Effect of fish meal replacement with toasted guar meal on growth, food conversion, digestive enzyme activity and final carcass composition of rohu,Labeo rohita

Abstract

A growth trial was conducted for 60 days in 4 × 4 m outdoor cement tanks with soil base to evaluate growth, feed conversion efficiency, carcass composition and digestive enzyme activity of rohu, Labeo rohita, fed diets incorporated with guar meal replacing fish meal. The isonitrogenous and isocaloric diets used were—a fish meal based diet (Control) and diets with fish meal replaced at 30%, 60% and 90% levels with guar meal. The growth parameters, feed conversion and protein efficiency ratio, survival and condition factors did not differ significantly among the different treatments. While the activity of the digestive enzymes in the hepatopancreas did not differ (p > 0.05) among the treatments, the activity of digestive enzymes estimated in the intestine showed reduction at higher levels of guar incorporation. Carcass composition analysis revealed the highest moisture and lowest crude protein, fat and gross energy levels in fish from 90% replacement group. Lowest moisture and highest crude protein, fat and energy levels were observed in fish from 30% replacement. The study indicated the possible use of processed guar meal as a fish meal substitute in the diet of rohu, resulting a reduction in feed cost without compromising on fish growth and quality.

Effects of dietary protein levels on growth performance, carcass composition, nutrient digestibility and digestive enzyme activity of the critically endangered peninsular carp,Hypselobarbus pulchellus(Day, 1870) fingerlings

“…In general, the activities of enzymes tested in H. pulchellus were lower in hepatopancreas compared to that in intestine. This phenomenon is in agreement with the findings by Umalatha et al (2016) and Barlaya, Ananda Kumar, et al (2021) in Labeo rohita.…”

“…The crude enzyme extracts of intestine and hepatopancreas from test animals were prepared as explained by Barlaya, Ananda Kumar, et al (2021) and stored at − 20°C. All extraction procedures were carried out at 4°C.…”

Effects of Dietary Lactic Acid Supplementation on the Activity of Digestive and Antioxidant Enzymes, Gene Expressions, and Bacterial Communities in the Intestine of Common Carp, Cyprinus carpio

“…However, it is not clear if such increases result from the higher secretion of the pancreatic enzymes to the lumen and/or they are derived from the microbes of the lumen. Barlaya et al [41] have shown that increase in a plant protein source in fish diet decreases the activity of digestive enzymes in the intestine, but not hepatopancreas. Moreover, organic acids may have no significant effects on digestive enzymes in the pancreas, as evidenced in shrimp [42,43].…”

Effects of Dietary Fish Meal Replaced by Fish Steak Meal on Growth Performance, Antioxidant Capacity, Intestinal Health and Microflora, Inflammatory Response, and Protein Metabolism of Large Yellow Croaker Larimichthys crocea

“…Apart from the growth performance and feed utilization, the digestive enzymes activity was also an important index for determining the potential of available protein sources as dietary FM substitutes for aquatic animals [ 26 ]. The AMS, LPS, and trypsin, three major digestive enzymes, are essential for the initial degradation of dietary starch, lipid, and protein, respectively [ 26 ]. The higher digestive enzymes activity represents the stronger digestive capacity.…”