<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Sea trout (<italic>Salmo trutta</italic> m. <italic>trutta</italic>) is a species for which effective methods of rearing are still being developed. They need high-quality protein in their diet, but, considering the ecological consequences of fishmeal production, new sources of protein are needed. Presently, insect meal is one of the most promising alternative sources of protein in the diets of farm animals. Insect production does not result in excessive gas emissions, waste generation or the risk of obtaining low-quality dietary protein. The study on sea trout larvae was carried out for 60 days. Four diets were given to the fish: one control (C), without the inclusion of insect meal, and three experimental, with one unhydrolysed <italic>Tenebrio molitor</italic> meal (TM) and two hydrolysed <italic>Tenebrio molitor</italic> meal treatments. The effects of the diets were evaluated on the basis of growth performance (weight and length of the fish, SR, SGR, RGR, FCR and PER), somatic indices (HSI and VSI) and fish condition (CF). We observed that the highest body mass and weight gain were obtained in the control group. However, the lowest mortality and the highest values of RGR were observed only in groups fed diets containing mealworm meal. The results for the hepato- and viscerosomatic indices showed a lack of statistically significant differences between the control group and the unhydrolysed <italic>Tenebrio molitor</italic> meal group in terms of the enzymatic activities of amylase, lipase and trypsin in the fish intestine and both aminotransferases in the liver. Our study demonstrated that the inclusion of 20% mealworm meal in practical diets for sea trout did not negatively affect growth performance or gastrointestinal tract (GIT) enzyme activity. The hydrolysed mealworm meal and the non-processed mealworm meal had similar effects.</p></abstract>

Sea trout (Salmo trutta m. trutta) is a species for which effective methods of rearing are still being developed. They need high-quality protein in their diet, but, considering the ecological consequences of fishmeal production, new sources of protein are needed. Presently, insect meal is one of the most promising alternative sources of protein in the diets of farm animals. Insect production does not result in excessive gas emissions, waste generation or the risk of obtaining low-quality dietary protein. The study on sea trout larvae was carried out for 60 days. Four diets were given to the fish: one control (C), without the inclusion of insect meal, and three experimental, with one unhydrolysed Tenebrio molitor meal (TM) and two hydrolysed Tenebrio molitor meal treatments. The effects of the diets were evaluated on the basis of growth performance (weight and length of the fish, SR, SGR, RGR, FCR and PER), somatic indices (HSI and VSI) and fish condition (CF). We observed that the highest body mass and weight gain were obtained in the control group. However, the lowest mortality and the highest values of RGR were observed only in groups fed diets containing mealworm meal. The results for the hepato- and viscerosomatic indices showed a lack of statistically significant differences between the control group and the unhydrolysed Tenebrio molitor meal group in terms of the enzymatic activities of amylase, lipase and trypsin in the fish intestine and both aminotransferases in the liver. Our study demonstrated that the inclusion of 20% mealworm meal in practical diets for sea trout did not negatively affect growth performance or gastrointestinal tract (GIT) enzyme activity. The hydrolysed mealworm meal and the non-processed mealworm meal had similar effects.

Dietary Inclusion of <italic>Tenebrio Molitor</italic> Meal in Sea Trout Larvae Rearing: Effects on Fish Growth Performance, Survival, Condition, and GIT and Liver Enzymatic Activity

Annals of Animal Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Dietary Inclusion of  Meal in Sea Trout Larvae Rearing: Effects on Fish Growth Performance, Survival, Condition, and GIT and Liver Enzymatic Activity

Sea trout (Salmo trutta m. trutta) is a species for which effective methods of rearing are still being developed. They need high-quality protein in their diet,...

Dietary Inclusion of Tenebrio Molitor Meal in Sea Trout Larvae Rearing: Effects on Fish Growth Performance, Survival, Condition, and GIT and Liver Enzymatic Activity

Published Online: May 04, 2020

Page range: 579 - 598

Received: Aug 10, 2019

Accepted: Dec 12, 2019

DOI: https://doi.org/10.2478/aoas-2020-0002

Keywords
insect meal, sea trout, larvae rearing, growth performance, hydrolysed protein

© 2020 Lilianna Hoffmann et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Dietary Inclusion of Tenebrio Molitor Meal in Sea Trout Larvae Rearing: Effects on Fish Growth Performance, Survival, Condition, and GIT and Liver Enzymatic Activity

Published Online: May 04, 2020

Page range: 579 - 598

Received: Aug 10, 2019

Accepted: Dec 12, 2019

DOI: https://doi.org/10.2478/aoas-2020-0002

Keywordsinsect meal, sea trout, larvae rearing, growth performance, hydrolysed protein

© 2020 Lilianna Hoffmann et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
insect meal, sea trout, larvae rearing, growth performance, hydrolysed protein