Formalin treatments before eyeing and hand-picking of Arctic charr (Salvelinus alpinus) eggs – re-evaluating the timing of antifungal treatments Tom Robin Olk Espen Lydersen Jens Wollebæk 10.23642/usn.7334573.v1 https://usn.figshare.com/articles/dataset/Formalin_treatments_before_eyeing_and_hand-picking_of_Arctic_charr_Salvelinus_alpinus_eggs_re-evaluating_the_timing_of_antifungal_treatments/7334573 <p>Arctic charr (<i>Salvelinus alpinus</i>) eggs in hatcheries are treated for fungal infections using formalin before, and hand-picking during the eyed stage. The relative effectiveness of the treatments was evaluated using a factorial design with the application of weekly hand-picking, and formalin treatments at 380 ppm for 13 minutes three times weekly as factors. The effects of the treatments on total mortality and hatching success were compared using a two-way ANOVA. Both treatments exhibited significant, positive effects on egg survival. Hand-picking during the eyed stage (+ 0.5 to 2.5 % survival to hatch) was found to be more effective than formalin treatments before (+ 0.0004 to 0.8 % survival to hatch). This is likely due to differences in the timing of administration of the treatments. The probability of fungal infections is indicated to vary with time, and a peak seemed to occur at hatch. </p> 2019-02-12 11:25:30 antifungal treatments fish eggs Salvelinus alpinus Formalin Hand-picking Animal Reproduction Aquaculture Fish Pests and Diseases