Digestibility of Insect Meals for Nile Tilapia Fingerlings.

Táfanie Valácio Fontes,Tamira Maria Maria Orlando,Kátia Rodrigues Batista De De Oliveira,Priscila Vieira E Rosa,Izabella Luiza Gomes Almeida,Paulo Borges Rodrigues,Diego Vicente Da Costa

doi:10.3390/ani9040181

Táfanie Valácio Fontes, Tamira Maria Maria Orlando + Show 5 more

Open Access

https://doi.org/10.3390/ani9040181

Copy DOI

Abstract

Simple SummaryInsects can be a source of nutrients for aquatic organisms, replacing scarce or unsustainable foods. The diversity of insect species contributes to their variable nutritional composition, which fish may digest differently. Nile tilapia is a very important fish for aquaculture, which requires great quantities of quality protein and other dietary nutrients on its initial rearing phase. Therefore, it is important to better understand the technical feasibility of using insect meal as a nutrient and energy source for Nile tilapia fingerlings. In this study, Tenebrio molitor larvae meal showed the highest apparent digestibility coefficient, being attested as a potential alternative feed for Nile tilapia fingerlings. Those findings may contribute to sustainable development of the tilapia production around the world.Insects are a valuable source of nutrients for fish, but little is known about their nutritional value for Nile tilapia fingerlings. To evaluate the nutritional value and energy apparent digestibility coefficient (ADC) of five insects for Nile Tilapia male fingerlings, 900 fish were distributed in 18 fiberglass conic tanks, in a completely randomized design, with six dietary treatments (control, Nauphoeta cinerea meal (NCM) (Blattodea), Zophobas morio larvae meal (ZMM) (Coleptera), Gromphadorhina portentosa meal (GPM) (Blattodea), Gryllus assimilis meal (GAM) (Orthoptera) and Tenebrio molitor larvae meal (TMM) (Coleptera)) and three replicates (tanks), each containing 50 fish. The control diet had no insect meal included and the other five treatments comprised 80% commercial diet and 20% test ingredient with 0.1% chromic oxide as an inert marker. TMM presented a higher ADC for dry matter, protein, corrected protein and chitin than to other treatments (p < 0.01). GPM presented the highest ADC for lipids (p < 0.01). In general, the TMM presented better ADC of nutrients and energy and all the insect meals evaluated are potential feed for Nile tilapia fingerlings.

Highlights

The use of alternative ingredients in aquaculture feeds is intended to minimize the dependence on scarce, expensive or unsustainable feedstuff
Tenebrio molitor meal presented a higher apparent digestibility coefficient (ADC) for dry matter, protein, corrected protein and chitin than the other tested ingredients (p < 0.01)
The cricket Gryllus assimilis meal had the lowest digestibility for protein and corrected protein (p < 0.01)

Summary

Introduction

The use of alternative ingredients in aquaculture feeds is intended to minimize the dependence on scarce, expensive or unsustainable feedstuff. The main ingredients traditionally used in fish feed are commodities whose price is set by the inconstant global supply and demand. Soybean meal is one of the most used vegetal protein sources in aquafeed formulation due to its high protein content, and amino acid profile as well as its price [1]. Animals 2019, 9, 181 fish, leading to non-absorption of nutrients, and impairing fish growth [2]. Another valuable ingredient used in aquaculture feed is fishmeal, but its high global demand has led to overfishing, natural fish stock reduction and price fluctuations [3]. Studies on alternative feeds for aquatic organisms are very important

Objectives

Methods

Results

Discussion

Conclusion