Effects of inbreeding on body weight at harvest size and grow-out survival rate in a selected population of Pacific white shrimp Penaeus (Litopenaeus) vannamei

Abstract Text: To study the effect of inbreeding on body weight at harvest size (130 days of age) and grow-out survival rate (65-130 days of age) in a nucleus breeding population, an experiment was designed to generate inbred families product of sibling mating in three successive generations, as well as groups of families with a range of inbreeding coefficients in a broodstock line selected for growth and survival. Inbreeding coefficients varied between 0 and 60.4%.  A total of 16,361 shrimp from 320 families were analyzed. Data was analyzed using mixed linear model methodology and restricted maximum likelihood methods. Inbreeding had a negative effect on body weight at harvest size of -2.19 ± 0.41% per 10% increase on the inbreeding coefficient (P < 0.001), but it did not have an effect on grow-out survival rate.

Keywords:

inbreeding

growth

survival

Penaeus (Litopenaeus) vannamei