Does Genetic Background of Rainbow Trout Impact Growth and Feed Utilisation following Fishmeal Substitution by Partly Defatted Insect Meal (Hermetia illucens) or Microalgae Powder (Arthrospira platensis)?

A growth trial was carried out to evaluate differences in feed utilisation and performance response substitution of fishmeal (FM) by either partly defatted insect meal or microalgae powder different strains rainbow trout. Three iso-nitrogenous iso-energetic diets were fed 495 juvenile trout with initial weight 150 ± 37 g. Whereas, the control diet included 20% FM, two experimental free FM. Instead that, an equal amount spray-dried Spirulina (SP) Hermetia (HM) applied as alternative protein source. Feed investigated a commercial breed (TL) three local (HK3, HK7, HK8) over period 56 days using replicates per diet. Diets relative fish body throughout at constant rate 1.0%. Although comparable among diets, differed between breeds. The strain TL tended express highest specific rate, however, associated lower conversion. Protein superior irrespective diet, most pronounced HK7 TL. Due large weights, compensatory might have affected study’s outcome. Both sources showed be adequate fully replace FM for Improved adaption including high levels HM SP achieved selective breeding.