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Feed Efficiency, Tissue Growth and Energy Budget Changes during the Molting Cycle of Juvenile Mud Crab, Scylla Serrata: Effects of Dietary Proteins, Fishmeal versus Soy Protein Concentrate
Nguyen, N.T.B.; Wantiez, L.; Lemaire, P.; Chim, L. Feed Efficiency, Tissue Growth and Energy Budget Changes during the Molting Cycle of Juvenile Mud Crab, Scylla serrata: Effects of Dietary Proteins, Fishmeal versus Soy Protein Concentrate. Fishes2022, 7, 334.
Nguyen, N.T.B.; Wantiez, L.; Lemaire, P.; Chim, L. Feed Efficiency, Tissue Growth and Energy Budget Changes during the Molting Cycle of Juvenile Mud Crab, Scylla serrata: Effects of Dietary Proteins, Fishmeal versus Soy Protein Concentrate. Fishes 2022, 7, 334.
Nguyen, N.T.B.; Wantiez, L.; Lemaire, P.; Chim, L. Feed Efficiency, Tissue Growth and Energy Budget Changes during the Molting Cycle of Juvenile Mud Crab, Scylla serrata: Effects of Dietary Proteins, Fishmeal versus Soy Protein Concentrate. Fishes2022, 7, 334.
Nguyen, N.T.B.; Wantiez, L.; Lemaire, P.; Chim, L. Feed Efficiency, Tissue Growth and Energy Budget Changes during the Molting Cycle of Juvenile Mud Crab, Scylla serrata: Effects of Dietary Proteins, Fishmeal versus Soy Protein Concentrate. Fishes 2022, 7, 334.
Abstract
Three isoenergetic diets differing on their fishmeal/ soy protein concentrate (SPC) ratio were assessed on tissue growth and energy budget of juvenile crabs Scylla serrata in postmolt stages (PMolt) and in intermolt stages (IMolt). The average growth rate on dry matter basis, were 2.064 ± 0.324% and 0.492 ± 0.08% initial BW.day-1 during PMolt and IMolt stages respectively. The efficiency in feed conversion (FCE, %), protein retention (PRE, %) and energy retention (ERE, %) were similar for the 3 experimental diets. However, FCE, PRE and ERE in PMolt stages were 4 to 5 times higher than in IMolt stages. Feed intake, energy and protein required for growth in PMolt stages were obviously higher than in IMolt stages. The energy budgets (%total energy intake) were marginally affected by diet but were significantly affected by the molt stage. Maintenance energy was lower in PMolt stages (49.84 ± 4.9%) than in IMolt stages (83.33 ± 2.45%). The excess of maintenance energy in IMolt stages represents the portion set aside for next molt: shell energy content (4.97 ± 0.31%) and energy for ecdysis (± 28%). Conversely, recovery energy was significantly higher in PMolt stages (34.39 ± 0.99%) than in IMolt stages (8.33 ± 1.7%). In conclusion SPC sustained good tissue growth and good feed utilization and can be used as a main source of dietary protein for crab juveniles in captivity.
Keywords
fish meal; soy protein concentrate; feed efficiency; tissue growth; protein requirement; energy budget; juvenile crab; Scylla serrata
Subject
Biology and Life Sciences, Animal Science, Veterinary Science and Zoology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.