Study of consuming earthworm (Eisenia foetida) in rainbow trout (Oncorhynchus mykiss) nutrition (as base of protein source)

Eisenia foetida the species of earthworm is a part of important commercial species that its culture has been considered all over the world in previous years. Also some activities have been carried out in this field during these years. This inquiry has been done because of applying earthworm in rainbow trout fish (Oncorhynchus mykiss) feeding.In this examination the effect of various levels of earthworm in rainbow trout growth in (GFT2) stage was done. At the beginning, the weight of fishes was 140g. Each treatment was consist of 20 number of Rainbow trout fish. The required water for culturing was provided from a spring which was close to the farm with 14 mean temperatures. Four experimental diets on the basic of 38 percent of protein, 3300Kcal amount of energy and 13 percent of fat were containing of 10, 20 and 30 percent of earthworm. And another diet without earthworm was used as a control diet for feeding during a six weeks cultural period. In this examination, the parameters such as weight increasing percentage, total length increasing by the attention of the applied foods were measured. The diets that were consist of diverse levels of earthworm had significant differences (a = 0.5%) on weight increasing, total length increasing, standard length increasing and conversion factor. In comparing between different treatment, the diets which had 20 percent of earthworm had signification differences in the statically sight in weight, conversion factor, FER, total and standard length regarding the other diets and also had the best condition.