Data from: Superfetation reduces the negative effects of pregnancy on the fast-start escape performance in live-bearing fish Fleuren, Mike; Van Leeuwen, Johan L.; Pollux, Bart J.A. The file 'Morphology_Fast-start_final-data.xls' is used for all the statistical analyses in our manuscript. Nomenclature: _s{}: Measurements at specific points of the body (20: abdomen; 40: caudal peduncle) _xy: Measurements in the horizontal plane (world reference frame) _z: Measurements in the vertical plane (world reference frame) _st1: Measured over fast-start stage 1 only _st2: Measured over fast-start stage 2 only The file contains the following columns: Individual: Key for each individual Species: Key for each species (1=Poeciliopsis turneri, 2=Heterandria formosa, 3=Phalloptychus januarius) Treatment: Key for reproductive status (1=pregnant, 0=virgin) Time_Preg1: Day of the interbrood interval (unit=days) Time_IB1: Day of the first interbrood interval (unit=days, empty in subsequent interbrood intervals) N_part: Number of parturitions in measurement period Volume: Absolute volume in SL^3 FrontalArea: Absolute Frontal Area in SL^3 WettedArea: Absolute Wetted Area in SL^3 Width_s{}: Width at specific points of the body in SL^3 Height_s{}: Height at specific points of the body in SL^3 Vmax: Absolute maximum speed (SL/s) Vmax_{}: Absolute maximum speed (SL/s) by plane Max_curv_s{}: Maximum attained curvature Curv_st{}_s{}: Curvature at points in the manoeuvre and at specifiv locations of the body Yaw_onset: Yaw angle at the onset of motion Yaw_change_st1: Yaw change from the onset of motion until the end of stage 1 Yaw_change_st2_total: Yaw change from the onset of motion until the end of stage 2 Yaw_change_st1_st2: Yaw change during stage 2 only Pitch_onset: Pitch angle at the onset of motion Pitch_change_st1: Pitch change from the onset of motion until the end of stage 1 Pitch_change_st2_total: Pitch change from the onset of motion until the end of stage 2 Pitch_change_st1_st2: Pitch change during stage 2 only Max_curv_rate_s{]: Maximum attained curvature rate by body position Max_curv_rate_st{}_s{}: Maximum attained curvature rate by body position during the specific stages of the manoeuvre Nth_movie_day: Count of the number of recordings for that individual for that measurement day Nth_movie_total: Count of the total number of recordings for that individual Frame_onset: Frame in which the onset of motion takes place Frame_st1: Frame in which the end of stage 1 is detected Frame_st2: Frame in which the end of stage 2 is detected Moving_start: Fish was moving at the onset of the fast-start motion (1=True) SL: Standard length in m Wetweight: Wetweight of the opcomming brood in g