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Article

The Effect of Hydrolyzed Insect Meals in Sea Trout Fingerling (Salmo trutta m. trutta) Diets on Growth Performance, Microbiota and Biochemical Blood Parameters

1
Department of Animal Nutrition, Poznań University of Life Sciences, Wołyńska 33, 60-637 Poznań, Poland
2
Institute of Zoology, Division of Inland Fisheries and Aquaculture, Poznań University of Life Sciences, Wojska Polskiego 71c, 60-625 Poznań, Poland
*
Authors to whom correspondence should be addressed.
Animals 2020, 10(6), 1031; https://doi.org/10.3390/ani10061031
Received: 7 May 2020 / Revised: 29 May 2020 / Accepted: 9 June 2020 / Published: 13 June 2020
(This article belongs to the Special Issue Alternatives Protein in Animal Nutrition)
The replacement of fishmeal by environmentally sustainable alternative meals has been one of the targets in aquaculture in recent decades. A number of factors support the use of insect meals, as a group of products characterized by high crude protein and crude fat content, in fish nutrition. Insects are readily accepted by a number of fish species, and they are part of the natural diet of omnivorous and carnivorous species. The present study was conducted to evaluate the effects of hydrolyzed Tenebrio molitor and Zophobas morio meals as a partial replacement for fishmeal in sea trout (Salmo trutta m. trutta) diets on growth performance, feed utilization, organosomatic indices, serum biochemistry, gut histology, and microbiota. In the present study, insect meals inclusion did not cause any adverse impacts on growth performance, feed utilization or gut histomorphology. However, an effect on the organosomatic indices, serum biochemistry, and microbiota was observed. In conclusion, hydrolyzed T. molitor and Z. morio meals seem to be promising alternative protein sources for sea trout nutrition.
The present study is the first introduction of hydrolyzed superworm meal in sea trout nutrition. It was conducted to evaluate the effects of inclusion in the diet of hydrolyzed insect meals as a partial replacement for fishmeal on growth performance, feed utilization, organosomatic indices, serum biochemical parameters, gut histomorphology, and microbiota composition of sea trout (Salmo trutta m. trutta). The experiment was performed on 225 sea trout fingerlings distributed into three groups (3 tanks/treatment, 25 fish/tank). The control diet was fishmeal-based. In the experimental groups, 10% of hydrolyzed mealworm (TMD) and superworm (ZMD) meals were included. The protein efficiency ratio was lower in the TMD and ZMD. Higher organosomatic indices and liver lipid contents were found in the group fed ZMD. The ZMD increased levels of aspartate aminotransferase, and decreased levels of alkaline phosphatase. The Aeromonas spp. and Enterococcus spp. populations decreased in the ZMD. The concentrations of the Carnobacterium spp. decreased in the ZMD and TMD, as did that of the Lactobacillus group in the TMD. In conclusion, insect meals may be an alternative protein source in sea trout nutrition, as they yield satisfying growth performance and have the capability to modulate biochemical blood parameters and microbiota composition. View Full-Text
Keywords: Tenebrio molitor; Zophobas morio; hydrolyzed insect meals; fish nutrition; fish health; blood biochemistry; microbiota; growth performance; feed efficiency Tenebrio molitor; Zophobas morio; hydrolyzed insect meals; fish nutrition; fish health; blood biochemistry; microbiota; growth performance; feed efficiency
MDPI and ACS Style

Mikołajczak, Z.; Rawski, M.; Mazurkiewicz, J.; Kierończyk, B.; Józefiak, D. The Effect of Hydrolyzed Insect Meals in Sea Trout Fingerling (Salmo trutta m. trutta) Diets on Growth Performance, Microbiota and Biochemical Blood Parameters. Animals 2020, 10, 1031. https://doi.org/10.3390/ani10061031

AMA Style

Mikołajczak Z, Rawski M, Mazurkiewicz J, Kierończyk B, Józefiak D. The Effect of Hydrolyzed Insect Meals in Sea Trout Fingerling (Salmo trutta m. trutta) Diets on Growth Performance, Microbiota and Biochemical Blood Parameters. Animals. 2020; 10(6):1031. https://doi.org/10.3390/ani10061031

Chicago/Turabian Style

Mikołajczak, Zuzanna, Mateusz Rawski, Jan Mazurkiewicz, Bartosz Kierończyk, and Damian Józefiak. 2020. "The Effect of Hydrolyzed Insect Meals in Sea Trout Fingerling (Salmo trutta m. trutta) Diets on Growth Performance, Microbiota and Biochemical Blood Parameters" Animals 10, no. 6: 1031. https://doi.org/10.3390/ani10061031

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