Data S1. Body weight measurements of four genetic types of catfish in tank culture. Explanation of column names: Fish_ID: invidivual fish identity Date of fertilization: fertilization date Genetic type: genetic background (cross direction). CC: pure breed channel catfish Ictalurus punctatus; BB: pure breed blue catfish Ictalurus furcatus; CB: channel catfish female × blue catfish male hybrids; BC: blue catfish female × channel catfish male hybrids. Sex: male, female, n/a (sex information unavailable) Date2: body weight measurement date BW2(g): body weight value in grams Date3: body weight measurement date BW3(g): body weight value in grams Date4: body weight measurement date BW4(g): body weight value in grams Date5: body weight measurement date BW5(g): body weight value in grams Date6: body weight measurement date BW6(g): body weight value in grams Date7: body weight measurement date BW7(g): body weight value in grams Date8: body weight measurement date BW8(g): body weight value in grams Date9: body weight measurement date BW9(g): body weight value in grams Euthanized for tissue collection: date of euthanization for tissue sample collection Data S2. Body weight measurements of four genetic types of catfish in pond culture. Explanation of column names: Fish_ID: invidivual fish identity Date of fertilization: fertilization date Genetic type: genetic background (cross direction). CC: pure breed channel catfish Ictalurus punctatus; BB: pure breed blue catfish Ictalurus furcatus; CB: channel catfish female × blue catfish male hybrids; BC: blue catfish female × channel catfish male hybrids. Sex: male, female, n/a (sex information unavailable) Date1: body weight measurement date BW1(g): body weight value in grams Date2: body weight measurement date BW2(g): body weight value in grams Date3: body weight measurement date BW3(g): body weight value in grams Date4: body weight measurement date BW4(g): body weight value in grams Date5: body weight measurement date BW5(g): body weight value in grams Date6: body weight measurement date BW6(g): body weight value in grams Date7: body weight measurement date BW7(g): body weight value in grams Date8: body weight measurement date BW8(g): body weight value in grams Date9: body weight measurement date BW9(g): body weight value in grams Data S3. Raw survival data of four genetic types of catfish in pond culture environment. One spreadsheet for each genetic type: CC: pure breed channel catfish Ictalurus punctatus; BB: pure breed blue catfish Ictalurus furcatus; CB: channel catfish female × blue catfish male hybrids; BC: blue catfish female × channel catfish male hybrids. Fish_ID: invidivual fish identity Date1: survival check date Age1: age in months Dead on date1: survival status (0: dead; 1: live) Date2: survival check date Age2: age in months Dead on date2: survival status (0: dead; 1: live) Date3: survival check date Age3: age in months Dead on date3: survival status (0: dead; 1: live) Date4: survival check date Age4: age in months Dead on date4: survival status (0: dead; 1: live) Date5: survival check date Age5: age in months Dead on date5: survival status (0: dead; 1: live) Date6: survival check date Age6: age in months Dead on date6: survival status (0: dead; 1: live) Date7: survival check date Age7: age in months Dead on date7: survival status (0: dead; 1: live) Date8: survival check date Age8: age in months Dead on date8: survival status (0: dead; 1: live) Date9: survival check date Age9: age in months Dead on date9: survival status (0: dead; 1: live)