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5 March 2024 Investigation of the suitability of 3 insect meals as protein sources for rainbow trout (Oncorhynchus mykiss)
Cheyenne E. Owens, Madison S. Powell, T. Gibson Gaylord, Zachariah B. Conley, Wendy M. Sealey
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Abstract

An in vivo trial was conducted to determine the apparent digestibility coefficients (ADCs) of insect meals for rainbow trout, Oncorhynchus mykiss. Rainbow trout (approximately 370 g ± 23 g, mean ± SD initial weight) were stocked 25 per tank into 400-liter tanks. Fish were fed a reference diet, or 1 of 5 test diets created by blending the reference diet in a 70:30 ratio (dry-weight basis) with menhaden fish meal (MFM), 2 house cricket (Acheta domesticus) meals (cricket A and cricket B), Galleria mellonella meal, and yellow mealworm (Tenebrio molitor) meal. Diets were assigned to 3 replicate tanks of fish and fed twice daily for 14 days prior to fecal collection. Ingredients, diets, and fecal matter were analyzed in duplicate for proximate, mineral, and amino acid composition. House cricket meals were 67.3% and 69.0% protein (CP) and 16.6% and 17.1% lipid (CL), for house cricket A and B, respectively. Yellow mealworm meal contained 56.5% CP and 27.7% CL, and G. mellonella larvae meal contained 32.5% CP and 54.2% CL. Protein ADCs were 78.9 for G. mellonella larvae meal, 78.0 for yellow mealworm meal, and 76.5 for house cricket A and not different from the MFM protein ADC of 76.6, while house cricket B protein ADC was 65.8 and was significantly lower than the MFM protein ADC (F = 7.39; df = 4,14; P = 0.0049).Together, these nutritional values suggest house crickets, and yellow mealworms show promise as alternative protein sources in salmonid feeds, with the potential of G. mellonella as an alternative lipid source.

Cheyenne E. Owens, Madison S. Powell, T. Gibson Gaylord, Zachariah B. Conley, and Wendy M. Sealey "Investigation of the suitability of 3 insect meals as protein sources for rainbow trout (Oncorhynchus mykiss)," Journal of Economic Entomology 117(4), 1254-1260, (5 March 2024). https://doi.org/10.1093/jee/toae037
Received: 30 November 2023; Accepted: 27 February 2024; Published: 5 March 2024
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KEYWORDS
G. mellonella
house cricket
nutrient availability
Rainbow Trout
yellow mealworm
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