Housefly (Musca domestica) Larvae Preparations after Removing the Hydrophobic Fraction Are Effective Alternatives to Fish Meal in Aquaculture Feed for Red Seabream (Pagrus major)

Los preparados de larvas de mosca doméstica (*Musca domestica*) tras la eliminación de la fracción hidrofóbica son alternativas eficaces a la harina de pescado en alimentos acuícolas para el besugo japonés (*Pagrus major*)

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ID: 112168
2019
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Abstract
Insects are an attractive alternative to fish meal (FM) as a sustainable protein source in aquaculture feed that does not negatively impact the marine ecosystem. Despite housefly (Musca domestica) larvae having adequacy of amino acid profiles, they have sometimes been reported to be inferior to FM, especially for marine carnivorous fish species. Here, we report that the removal of the hydrophobic fractions from housefly larvae enables significant replacement of FM in the diet of the red seabream (Pagrus major). In a feeding trial, housefly (HF) larvae that had the hydrophobic fraction removed as a complete substitution for 70% FM produced satisfactory growth. However, HF larvae that were supplemented with the hydrophobic fraction resulted in significant growth reduction. Growth recovery was incomplete by supplementation of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) to undefatted HF larvae, being equivalent to that of fatty acid content with a control diet. Moreover, fish with a dietary intake of catechol identified from the hydrophobic fraction of the HF showed growth reduction and morphological alterations in the intestine. Our findings indicate that the hydrophobic fraction from HF larvae contains a negative factor for fish growth and eliminating the fraction from HF larvae is thought to be an important process for sustainable aquaculture.
Los insectos constituyen una alternativa atractiva a la harina de pescado (FM) como fuente sostenible de proteínas para la alimentación en acuicultura que no repercute negativamente en el ecosistema marino. A pesar de que las larvas de mosca doméstica (*Musca domestica*) presentan perfiles de aminoácidos adecuados, en ocasiones se ha informado que son inferiores a la FM, especialmente para especies de peces marinos carnívoros. En este estudio, reportamos que la eliminación de las fracciones hidrófobas de las larvas de mosca doméstica permite una sustitución significativa de la FM en la dieta del besugo rojo (*Pagrus major*). En un ensayo de alimentación, las larvas de mosca doméstica (HF) a las que se les extrajo la fracción hidrófoba como sustitución completa del 70 % de la FM produjeron un crecimiento satisfactorio. Sin embargo, las larvas de HF suplementadas con la fracción hidrófoba dieron lugar a una reducción significativa del crecimiento. La recuperación del crecimiento fue incompleta tras la suplementación con ácido docosahexaenoico (DHA) y ácido eicosapentaenoico (EPA) en larvas de HF no desgrasadas, aun siendo equivalente al contenido de ácidos grasos de una dieta control. Asimismo, los peces que consumieron dietas con catecol, identificado en la fracción hidrófoba de las HF, mostraron una reducción del crecimiento y alteraciones morfológicas en el intestino. Nuestros hallazgos indican que la fracción hidrófoba de las larvas de HF contiene un factor perjudicial para el crecimiento de los peces, por lo que se considera que la eliminación de dicha fracción en las larvas de HF constituye un proceso fundamental para una acuicultura sostenible.
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hashizume2019fisheshousefly Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Atsushi Hashizume;Atsushi Ido;Takashi Ohta;Serigne Thierno Thiaw;Ryusaku Morita;Munenori Nishikawa;Takayuki Takahashi;Chiemi Miura;Takeshi Miura;Hashizume, Atsushi;Ido, Atsushi;Ohta, Takashi;Thiaw, Serigne Thierno;Morita, Ryusaku;Nishikawa, Munenori;Takahashi, Takayuki;Miura, Chiemi;Miura, Takeshi;
Journal fishes
Year 2019
DOI
10.3390/fishes4030038
URL
https://www.mdpi.com/2410-3888/4/3/38
Keywords
catechol sustainable aquaculture fish meal replacement insect for feed

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