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    • Article

      Dietary substitution of protein concentrate of Ulva lactuca for soybean meal in the black tiger shrimp Penaeus monodon fry 

      AE Serrano Jr. & RB Santizo - Animal Biology and Animal Husbandry, 2014 - Bioflux Society
      A feeding trial was conducted to test the protein concentrate of the green seaweed Ulva lactuca as a substitute for soybean meal in the diet of the black tiger shrimp Penaeus monodon fry. Experimental diets containing various replacement levels for soybean meal by weight were prepared, namely 0 (control diet), 15, 30 or 45% Ulva protein concentrate (UPC). Survival rate was not affected by the diets. Feed intake (FI) was statistically similar in shrimp fed the control diet and diet containing 15% UPC replacement while the FI of shrimps fed diets containing 30% and 45% were lower and were not significantly different from each other. SGR of shrimps fed the control diet was not significantly different from the values of those fed diets containing 15% and 30% UPC replacements while those fed diets containing 45% UPC replacement exhibited significantly the lowest SGR. Protein gained of shrimps were statistically similar between those fed the control diet and those fed diets with 15% and 30% UPC while those fed diets at 45% UPC was significantly lower than the three groups. Protein efficiency ratio (PER) was unaffected by the dietary treatments. Ulva protein concentrate could be a substitute for soybean meal in the diet of Penaeus monodon fry up to 30% without compromising the survival, growth and feed utilization efficiency of the shrimp despite lower feed intake.
    • Article

      Potential use of the sea lettuce Ulva lactuca replacing soybean meal in the diet of the black tiger shrimp Penaeus monodon juvenile 

      AE Serrano Jr., RB Santizo & BLM Tumbokon - Aquaculture, Aquarium, Conservation and Legislation, 2015 - Bioflux
      To evaluate the biological value of incorporating the sea lettuce Ulva lactuca meal in the diet of the black tiger shrimp (Penaeus monodon), 3 diets were fed to groups of shrimps containing two levels (15% and 30% replacement of soybean meal) of the sea lettuce for 90 days. Biological parameters were determined either periodically or at the termination of the experiment. Specific growth rate (SGR) of shrimp fed the control diet and those fed with the diet containing 15% replacement were not significantly different from each other while that of shrimp fed 30% soybean replacement was slightly but significantly inferior. All other parameters such as survival rate, feed intake, food conversion efficiency, protein efficiency ratio protein and lipid deposited and body composition were all statistically similar between the experimental groups of shrimp. Thus, the 30% replacement level or 10.5% inclusion level could be used in the diet of the shrimp P. monodon. When performances were compared with the best result in incorporating U. lactuca protein concentrate from a previous study and that in the present study (both were 30% replacement or 10.5 inclusion level), they were statistically similar. Thus, the raw U. lactuca meal is recommended because it did not require additional processing to produce the concentrated seaweed.