Effects of dietary protein on growth performance, nutrient utilization, digestive enzymes and physiological status of grey mullet, Mugil cephalus L. fingerlings reared in inland saline water. (4th March 2020)

• Record Type: Journal Article
• Authors: Talukdar, Avinash; Deo, Ashutosh Dharmendra; Sahu, Narrotam Prasad; Sardar, Parimal; Aklakur, Muhammad; Prakash, Satya; Shamna, Nazeema; Kumar, Sarvendra
• Is Part Of: Aquaculture nutrition. Volume 26:Number 3(2020)
• Page Start: 921
• Page End: 935
• Publication Date: 2020-03-04
• Subjects: dietary protein requirement -- grey mullet -- growth -- inland saline water -- physiological status -- protein utilization; Aquaculture -- Periodicals; Aquatic animals -- Feeding and feeds -- Periodicals; Fishes -- Feeding and feeds -- Periodicals; 639.3
• DOI: 10.1111/anu.13050
• Languages: English
• ISSNs: 1353-5773

Abstract

Abstract: A 60 days feeding trial was conducted to illustrate the effect of graded levels of protein on the growth and metabolic enzymes of grey mullet ( Mugil cephalus L.) fingerlings reared in inland saline water (ISW). Six isoenergetic (16 MJ/kg) and isolipidic (60 g/kg) diets containing 240, 260, 280, 300, 320 and 340 g crude protein (CP)/kg diet were formulated and fed to triplicate. Weight gain %, specific growth rate, protein utilizing efficiency, feed efficiency and RNA:DNA ratio were significantly higher ( p < .05) in 320 and 300 g CP/kg diets. Fish fed with 240 g CP/kg diet showed significantly higher ( p < .05) feed intake, whole‐body lipid content, hepatosomatic index value and liver glycogen content. Transaminase enzymes and malate dehydrogenase activities were elevated in fish fed 340 g CP/kg diet. Protease activity increased with increasing dietary CP level, but amylase activities showed an inverse relationship. No significant ( p > .05) variations were observed for lactate dehydrogenase, oxidative stress enzymes, blood parameters and serum osmolality among all the treatment groups, but red blood cell count increases with increasing dietary CP levels. Based on the results, feeding dietary protein level of 300 g CP/kg is economically viable for rearing of grey mullet in ISW.