The influence of dietary protein concentration on digestive enzyme activities, growth, and body composition in juvenile bullseye snakehead (Channa marulius).

Autor: Nazir S; Department of Fisheries & Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan., Khan N; Department of Fisheries & Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan., Fatima M; Department of Fisheries & Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan., Azmat H; Department of Fisheries & Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan., Naveed S; Department of Animal Nutrition, University of Veterinary and Animal Sciences, Lahore, Pakistan., Ramzan MM; Department of Fisheries, Government of the Punjab, Lahore, Pakistan., Asghar M; Department of Fisheries & Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan., Bano S; Department of Fisheries & Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan., Khizer A; Department of Fisheries & Aquaculture, University of Veterinary and Animal Sciences, Lahore, Pakistan., Wan AHL; Aquaculture and Nutrition Research Unit (ANRU), Carna Research Station, Ryan Institute and School of Natural Sciences, College of Science and Engineering, University of Galway, Galway city, Ireland., Davies SJ; Aquaculture and Nutrition Research Unit (ANRU), Carna Research Station, Ryan Institute and School of Natural Sciences, College of Science and Engineering, University of Galway, Galway city, Ireland.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2023 Feb 14; Vol. 18 (2), pp. e0281274. Date of Electronic Publication: 2023 Feb 14 (Print Publication: 2023).
DOI: 10.1371/journal.pone.0281274
Abstrakt: The bullseye snakehead (Channa marulius) is considered as an affordable and robust freshwater fish for farming in Asia. However, there is limited knowledge on the species' full nutritional requirements to date with extensive gaps in our knowledge and particularly in precision aspects of protein requirements. Therefore, a three-month feeding trial was conducted under semi-intensive farming conditions to determine the protein requirement of bullseye snakehead using test diets containing 40 (P40), 45 (P45), 50 (P50), and 55% (P55) crude protein levels. The growth performance results revealed that the 55% dietary protein group (P55) had the highest final mean weight (14.09 g fish-1), and net weight gain (12.82 g fish-1). When compared to other dietary treatments, the final weight (R2 = 0.921), and weight gain (R2 = 0.913), displayed a linear increasing trend as dietary protein is raised. The lowest FCR was observed in 50% (1.94±0.01) and 55% (1.97±0.01) CP diet groups compared to dietary treatments. Further analysis has shown that the body protein content also significantly increased as dietary protein was raised to 55%. Although, a reverse trend was found in body lipid levels with increasing protein in the diet. The incremental dietary protein also elevated proximal intestinal protease activity but decreased amylase and lipase activity. The overall essential and non-essential amino acids levels of snakehead fillet muscle reflected an increase in dietary protein. Overall, this study has shown that the fish fed a diet with 55% crude protein attained the highest growth performance and nutrient profile of the whole fish when compared to other dietary treatments tested. It would appear we did not obtain the maximum potential for growth under the present experimental conditions due to the upper protein constraint of 55% in the diet. Further quantitative studies are suggested.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2023 Nazir et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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