Growth Performance of Nile Tilapia (Oreochromis niloticus) Fed Liquid Bioslurry-Supplemented Feed in Floating Net Cages

Abstract

This study aimed to evaluate the effect of liquid bioslurry supplementation in feed on the growth performance and body composition of Nile tilapia (Oreochromis niloticus) cultured in a floating net cage (FNC) system.The experiment was conducted from June to September 2024 in the waters of Makassar, using a Completely Randomized Design (CRD) with four concentrations of liquid bioslurry: A (33.33mL/100g of feed), B (66.66mL/100g), C (100mL/100g), and D (133.33mL/100g), each with three replicates.Observed variables included absolute growth, specific growth rate, survival rate, feed efficiency, feed conversion ratio, and body composition (crude protein, fat, fiber, ash, and nitrogenfree extract).The results showed that the addition of liquid bioslurry had a significant effect on the growth and feed efficiency of Nile tilapia (P<0.05).Treatment C (100mL/100g of feed) produced the best results in terms of absolute growth, feed efficiency, and body protein content.Quadratic regression analysis indicated that the optimal dosage of liquid bioslurry ranged between 95-105mL/100g of feed.In addition, water quality remained within acceptable ranges for aquaculture throughout the study period.The use of liquid bioslurry as a feed additive shows potential as an economical, environmentally friendly supplement that supports the principles of the circular economy in aquaculture.These findings highlight the opportunity to utilize livestock waste as a natural probiotic source in Nile tilapia farming.

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