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Partial replacement of fishmeal with Chaetomorpha algae improves feed utilization, survival, biochemical composition and fatty acids profile of farmed shrimp Penaeus monodon post larvae

Article scientifique 2022 Anglais

Résumé

Abstract Shrimp is an economic important shellfish species for aquaculture in Tanzania, however its farming is constrained by reliant to costly feeds, attributed by fishmeal (FM) as main ingredient, which is expensive and scarce. This study determined the efficacy of plant protein derived from Chaetomorpha algae (CA) on survival, feed utilization, biochemical composition and fatty acids profile of the cultured Penaeus monodon as potential candidate for replacing FM in feed formulation. Four experimental feeds; F0, F1, F2 and F3 were made, denoting FM replacement levels of 0, 10, 20 and 30%, respectively. Post-larvae weighing 0.49 ± 0.06 g were stocked at 15 individuals/m3 in 2m3 harpa nets in three replicates. F2 treatment showed significantly high survival rate. F2 and F3 improved growth significantly with F3 exhibiting the highest weight gain across treatments. Impacts of treatments on biochemical composition varied significantly across inclusion levels. The highest muscle somatic index (MSI) observed in F2 treatment. F3 treatment exhibited significantly high crude protein (CP) over the rest. Crude fat (CF) in F0 and F2 treatments were significantly high across inclusion levels. F0 and F1 treatments exhibited high proportion of saturated fatty acids (SFA) than the rest. In contrast, F2 and F3 treatments exhibited high levels of polyunsaturated fatty acids (PUFA) being superior to other treatments. Inclusion of CA at 20 to 30% levels in feed formulation improved feed utilization, biochemical composition and fatty acids profile of farmed Penaeus monodon. However, CA inclusion at 30% shown to impair survival rate and exhibited high saturated fatty acids. Thus, at 20% replacement level, CA is suitable for partial replacement of FM in P. monodon feeds formulation.

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Simtoe, A., Luvanga, S., Lugendo, B. (2022). Partial replacement of fishmeal with Chaetomorpha algae improves feed utilization, survival, biochemical composition and fatty acids profile of farmed shrimp Penaeus monodon post larvae. https://doi.org/10.21203/rs.3.rs-1902933/v1

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Ambakisye P. Simtoe Siwema Amran Luvanga Blandina R. Lugendo

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