Composition of gastrointestinal content, protease and lipase activities in summer and winter of four freshwater siluriforms (Teleostei: Actinopterygii) with two different feeding habits

Essential oils of plants whose main compound is citral showed beneficial effects when added to fish feed. The objective of the present study was to evaluate the dietary effect of the addition of citral on zootechnical parameters and digestive enzyme activities of Centropomus undecimalis. Juveniles were fed for 45 days with diets containing different amounts of citral (0.0 - control, 0.5, 1.0, and 2.0 mL per kg of diet). The water quality parameters were kept stable during the experiment and no mortality was observed. At the end of the experimental period, the treatment 0.5 mL citral per kg of diet had the lowest weight gain and specific growth rate, and the highest feed conversion, while the same parameters did not differ between the other treatments. Pepsin activity was higher in the stomach of fish fed with 0.5 mL citral per kg of diet and amylase activity was higher in the intestine of fish fed with 0.5 and 2.0 mL citral per kg of diet compared to the control group. Intestinal lipase activity was higher in all groups that were fed with citral compared to the control group. Chymotrypsin and trypsin activities showed no difference between groups. Consequently, dietary addition of citral at any of the levels tested is not recommended for common snook.

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“…Pepsin activity was assayed as described by HIDALGO et al (1999). Enzyme activities were calculated as described by ALMEIDA et al (2018).…”

Section: Digestive Enzymesmentioning

confidence: 99%

Citral as food additive for common snook - zootechnical parameters and digestive enzymes

et al. 2020

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“…The facts that the activity of this enzyme is dependent on the diet and ecological groups of fish; and the ratio of membrane activity to abdominal activity of amylase is greater for predatory fish than for herbivorous (reviewed by (Kuzmina, 1977). It is also known that the activity of digestive enzymes in the intestines of omnivorous fish is the greatest (Hidalgo, Urea and Sanz, 1999;Al-Tameemi, Aldubaikul and Salman, 2010;Gottlieb et al, 2018). This is true in our case in regard to horse mackerel, annual seabream, round goby, peacock wrasse, and red mullet, which have a wide food spectrum.…”

Section: Discussionmentioning

confidence: 99%

Variability of the hepatic α-amilase activities in the liver of fish species from the Sevastopol bays, Black Sea

Kuzminova

2020

BioComm

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This paper presents the results of a study of α-amylase activity in liver of widely represented species of twelve Black sea fish. Comparative analysis of interspecies differences showed that the medium level of enzyme activity is very high only in liver of annular seabream and horse mackerel. The Black Sea predators (scorpion fish, stargazer, shore rockling, whiting) have low values of the medium level of enzyme activity (range from 0,02 to 62,79 mg / s / g of protein). Enzyme activity did not depend on fish sex, their age and location. Research has established lack of any link between activity of enzyme and age for both the scorpion fish and high body pickarel. While studying the effects of seasonal features on enzyme activity in the liver of two dominant species in the coastal zone, it was concluded that enzyme activity is lower in winter than in other seasons.

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Dietary valine improved growth, immunity, enzymatic activities and expression of TOR signaling cascade genes in rainbow trout, Oncorhynchus mykiss fingerlings

Ahmad

Ahmed

Dar

2021

Sci Rep

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This study was conducted to determine the effects of dietary valine (Val) on growth, hemato-biochemical parameters, immunity, enzymatic activities, antioxidant status and expression of target of rapamycin (TOR) and 4E-BP genes in rainbow trout, Oncorhynchus mykiss (1.57 ± 0.03 g; 5.10 ± 0.34 cm). Six isonitrogenous (450 g kg−1) and isoenergetic (20.90 kJ 100 g−1, gross energy) diets were designed to represent varied Val levels (10.5, 13.0, 15.5, 18.0, 20.5 and 23.0 g kg−1 dry diet basis). Growth parameters improved significantly (P < 0.05) with the amelioration of dietary Val level up to 18.0 g kg−1. Highest (P < 0.05) body protein content was noted at 18.0 g kg−1 dietary Val. Significant differences in hematological, intestinal enzymatic activities and antioxidant parameters were noted. However, plasma variables did not show any significant differences except aspartate transaminase and uric acid. Total protein content increased significantly, while the albumin and globulin content did not show any significant (P > 0.05) difference. Moreover expression of TOR mRNA and elF4E-binding protein (4E-BP) was observed higher (P < 0.05) at 18.0 g kg−1 Val. On the basis of results, optimum dietary Val requirement for maximal growth of rainbow trout was determined to be 18.19 g kg−1 of dry diet, corresponding to 40.42 g kg−1 of dietary protein.

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Composition of gastrointestinal content, protease and lipase activities in summer and winter of four freshwater siluriforms (Teleostei: Actinopterygii) with two different feeding habits

Cited by 7 publications

References 32 publications

Citral as food additive for common snook - zootechnical parameters and digestive enzymes

Citral as food additive for common snook - zootechnical parameters and digestive enzymes

Variability of the hepatic α-amilase activities in the liver of fish species from the Sevastopol bays, Black Sea

Dietary valine improved growth, immunity, enzymatic activities and expression of TOR signaling cascade genes in rainbow trout, Oncorhynchus mykiss fingerlings

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