Influence of dietary protein level on growth performance, digestibility and activity of immunity‐related enzymes of leopard coral grouper,Plectropomus leopardus(Lacépède, 1802)

Abstract

An 8‐week feeding trial was conducted to assess the interaction between dietary protein levels and fish growth, digestibility and activity of immunity‐related enzymes of Plectropomus leopardus. Five diets with different protein levels (400 g/kg, 450 g/kg, 500 g/kg, 550 g/kg and 600 g/kg protein) were designed. P. leopardus fed with 500 g/kg, 550 g/kg and 600 g/kg dietary protein, showed higher weight gain rates than fish fed 400 g/kg and 450 g/kg dietary protein. Ingestion rate in fish fed with 500 g/kg dietary protein was significantly higher than those with other diets. P. leopardus fed with 500 g/kg, 550 g/kg and 600 g/kg dietary protein, showed that feed coefficients were significantly lower than those fed with 400 g/kg and 450 g/kg dietary protein. Net protein utilization was significantly lower in fish fed with 400 g/kg diet than those with other diets. Fish fed with 400 g/kg and 450 g/kg dietary protein had an apparent feed digestibility coefficient for dry matter that was significantly lower than that with other diets. Protease activity was highest in fish fed on 500 g/kg dietary protein. Fish fed with 500 g/kg dietary protein, had the highest superoxide dismutase activity. Fish fed with 600 g/kg dietary protein, had the highest alkaline phosphatase activity. Thus, a diet containing 500 g/kg protein is recommended for P. leopardus aquaculture.

Utilization of hydrolyzed corncob as a carbohydrate source in diets for red Nile tilapia Oreochromis niloticus

“…The amylase enzyme activity in Nile tilapia will increase along with the increased starch content in the diet (Fitriliyani, 2011). A similar condition was also found in Trachinotus ovatus, Larmichthys crocea dan Plectropomus leopardu (Zhou et al, 2015;Zhou et al, 2016;Xia et al, 2019). Meanwhile, the lowest lipase enzyme activity was obtained from the TJt15%, TJt30%, and TJh30% treatments.…”

Integrative Transcriptomics and Metabolomics Analysis of Body Color Formation in the Leopard Coral Grouper (Plectropomus leopardus)

“…Furthermore, prices of red leopard coral grouper are significantly higher than those of the black fish, particularly in Chinese markets which showed the different possibility for the environmental and economic values for different body color fishes. Multiple factors influence the body color of leopard coral groupers, including climate change (Pratchett et al, 2017), temperature (Lutfiyah et al, 2019), salinity (Setiawati et al, 2017), and diet (Xia et al, 2019). Recently, the P. leopardus genome has been published, providing a basis for further chances of the intrinsic mechanism underlying body color variation and adaptation (Yang et al, 2020;Zhou et al, 2020).…”

Effect of dietary bile acids supplementation on growth performance, feed utilization, intestinal digestive enzyme activity and fatty acid transporters gene expression in juvenile leopard coral grouper (Plectropomus leopardus)

“…The availability of highly qualified aquafeed is essential to support this growth, yet nutrition and feed studies in this fish species are still quite limited. It has only been reported that juvenile coral trout require a dietary crude protein content of 50% for optimum growth (Xia et al, 2020). Compared with other grouper species, coral trout have a slower feeding process and relatively lower feed utilization (Giri et al, 2021).…”