Journal
AQUACULTURE RESEARCH
Volume 52, Issue 11, Pages 5585-5594Publisher
WILEY
DOI: 10.1111/are.15434
Keywords
digestive enzymes; growth performance; insect meal; Nile tilapia; sustainable aquaculture
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The current study showed that increasing the level of insect meal originated from Spodoptera littoralis (SLM) in diets of Nile tilapia resulted in decreased growth performance and lowered lipid content, while feed conversion ratio increased. The inclusion of SLM did not have significant effects on hematological variables, immune responses, and antioxidative indices in tilapia diets, suggesting that it can be used as a partial replacement for fish meal in profitable production of Nile tilapia.
The current study evaluated the insect meal originated from Spodoptera littoralis (SLM) at 0, 50, 100, 150 and 200 g/kg in the diets of Nile tilapia for 60 days. Fish with similar initial sizes (17.28 +/- 0.03 g) were distributed into 15 glass aquaria (60 L; triplicates, 12 fish/aquarium). All aquaria provided with continuous aeration, and half of the water was replaced daily with dechlorinated freshwater. The formulated diets were nutritionally balanced in terms of crude protein, lipids, essential amino acids and gross energy. The final weight, weight gain, specific growth rate, feed intake and protein efficiency ratio were decreasing by increasing the level of SLM with the lowest value in fish fed 200 g SLM/kg while feed conversion ratio increased (p < 0.05). The intestinal lipase and amylase activities were lowered by increasing the inclusion levels of SLM (p < 0.05). The moisture, protein and ash contents were not altered by SLM (p > 0.05), while the lipid content was lowered by increasing the level of SLM in linear and quadratic trends (p < 0.05). The haematological variables, biochemical indices and immune responses did not alter by the inclusion of SLM in tilapia diets (p > 0.05) except for the alanine aminotransferase (ALT) and aspartate aminotransferase (AST) enzymes. The ALT was increased by increasing the level of SLM (p < 0.05). Interestingly, the immune and antioxidative indices were similar and did not reduce by increasing the level of SLM in the tilapia diet (p > 0.05). The replacement of FM with SLM up to 200 g SLM/kg is recommended for the profitable production of Nile tilapia.
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