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<p>Insect proteins, such as the common cricket (<i>Acheta domesticus</i>), are becoming popular as a potential substitute for fishmeal in aquaculture feed and have bioactive properties. Its cultivation has a lower use of land resources, although its industrial processing requires energy for grinding and drying. In two experiments, all at four inclusion levels and three replicates. The first experiment (Exp I) compares a whole cricket meal (CM) vs cricket acid silage (CAS), replacing 25% of CM with CAS to estimate the growth and digestibility of <i>Litopenaeus vannamei</i>. A significant trend towards increased growth was observed with higher amounts of CAS, and dry matter digestibility was significantly improved through an orthogonal analysis. In the second experiment (Exp II), the 15.5% fishmeal was replaced with different proportions of CAS (to maintain a similar protein content). Although digestibility remained above 70%, overall shrimp performance decrease with increasing CAS. Chitin content in cricket exceeded 25%, and changes in fatty acid composition were noted, with greater accumulation of oleic acid (18:1n9), while the decrease in linolenic acid (18:2n6) occurred as CAS increased. Hemolymph analysis revealed significant differences in glucose levels but not in total proteins or cholesterol. The study concludes that using acid silage from crickets could improve the circular economy, making crickets more digestible without the need for drying or cold storage in aquaculture. However, it is recommended to research further on a more appropriate amount of CAS or possibly using a chitinase in the procedure of acid silage to decrease the amount of chitin. Also, the possibility to standardize the insect feeds to have a better condition index (protein-fat-chitin) and more homogeneous raw material, particularly the fatty acids, was discussed. Further, when using insect meal, it is recommended to quantify the non-protein nitrogen from the chitin to adjust the crude protein in diets to avoid overestimation. It is concluded that despite our results not favoring the overall performance when substituting fish meal, the acidification of crickets to become acid silage could enhance the circular economy by improving apparent dry matter digestibility without the need for drying or low-temperature storage. However, further studies are needed to determine the amount in diets to result in growth benefits. Further, optimal insect culture methods to enhance the protein-to-chitin ratio are needed to improve its nutrient content.</p>

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Effect of cricket meal and acid cricket silage from Acheta domesticus in diets and as a substitute for fish meal and fish oil on the productive performance of Litopenaeus vannamei

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Abril Karina Mauro-Félix,
  • Martin Molinero,
  • Oscar Basilio del-Rio-Zaragoza,
  • Aurora Tinajero-Chavez,
  • Eulalio Arambul-Muñoz,
  • Emyr Saul Peña-Marín,
  • María Teresa Viana

摘要

Insect proteins, such as the common cricket (Acheta domesticus), are becoming popular as a potential substitute for fishmeal in aquaculture feed and have bioactive properties. Its cultivation has a lower use of land resources, although its industrial processing requires energy for grinding and drying. In two experiments, all at four inclusion levels and three replicates. The first experiment (Exp I) compares a whole cricket meal (CM) vs cricket acid silage (CAS), replacing 25% of CM with CAS to estimate the growth and digestibility of Litopenaeus vannamei. A significant trend towards increased growth was observed with higher amounts of CAS, and dry matter digestibility was significantly improved through an orthogonal analysis. In the second experiment (Exp II), the 15.5% fishmeal was replaced with different proportions of CAS (to maintain a similar protein content). Although digestibility remained above 70%, overall shrimp performance decrease with increasing CAS. Chitin content in cricket exceeded 25%, and changes in fatty acid composition were noted, with greater accumulation of oleic acid (18:1n9), while the decrease in linolenic acid (18:2n6) occurred as CAS increased. Hemolymph analysis revealed significant differences in glucose levels but not in total proteins or cholesterol. The study concludes that using acid silage from crickets could improve the circular economy, making crickets more digestible without the need for drying or cold storage in aquaculture. However, it is recommended to research further on a more appropriate amount of CAS or possibly using a chitinase in the procedure of acid silage to decrease the amount of chitin. Also, the possibility to standardize the insect feeds to have a better condition index (protein-fat-chitin) and more homogeneous raw material, particularly the fatty acids, was discussed. Further, when using insect meal, it is recommended to quantify the non-protein nitrogen from the chitin to adjust the crude protein in diets to avoid overestimation. It is concluded that despite our results not favoring the overall performance when substituting fish meal, the acidification of crickets to become acid silage could enhance the circular economy by improving apparent dry matter digestibility without the need for drying or low-temperature storage. However, further studies are needed to determine the amount in diets to result in growth benefits. Further, optimal insect culture methods to enhance the protein-to-chitin ratio are needed to improve its nutrient content.