Оценка кормового поведения радужной форели (Oncorhynchus mykiss) при внесении в корма комплексной кормовой добавки с включением компонентов, повышающих его поедаемость

Abstract

The potential to enhance the nutritional appeal of standard formulated feeds for rainbow trout by incorporating an additive with attractant and/or stimulant properties is demonstrated in the study. To assess the feeding behavior of the fish the evaluation algorithm was developed using a specialized setup with two feeding points, along with automatic video recording of the outcomes. The components within the feed additive (89% rapeseed oil, 4% hemp oil, 5% lycopene, and 2% cinnamyl aldehyde) not only aid in improving its palatability but can also have a positive influence on the fatty acid composition of the feeds. It was revealed that the feed additive (at quantities of 0.3% and 0.5%) significantly augmented the attractiveness of the feeds resulting in an increased number of fish congregating in the feeding area and an elevated consumption rate. The computation of the index of relative attractiveness allowed to identify a noteworthy disparity between the experimental and control feeds. The data obtained from the study can recommend the investigated comprehensive feed additive for enhancing the digestibility of standard fish feeds.