Patterns of morphometry variability in three stocks of farmed tiger shrimp, Penaeus monodon. in indonesia and its application for selective breeding

Abstract

Conventicirial genetic improvemenl programs still rely and exploit ihe patterns and amount of variation in ihe phcnotype of interest thai understanding both aspects is of great importance- This study was aimed la explore those important aspects and relate them with the context of breeding program. Three Stocks of farmed tiger shrimp derived from brood Stock originated from Aceh, Cilacap and Sumbawa, respectively, were sampled and measured for variability in 22 mo rp ho metric traits. The patterns of variability among traits were analyzed descriptively while those between stocks were analyzed using F tests. Exploration to find the best predictor; for tail weight was conducted using correlation coefficient and multiple stepwise regressions. Anlong-traitS variation was Strongly characterized by the type of data in that weight measured traits were twice higher in their variation relative to those lenglh measured traits. With several exceptions, levels of variation among Stocks, in descending order, were Aceh. Cilacap, and Sumbawa. Among the three between-stock comparisons. Aceh against Sumbawa yielded most number of iraits which were Statistically significant, followed by Aceh against Cilacap and Cilacap against Sumbawa. Morphometric traits, which best explained variation in the tail weight were combination of partial length, anterior and posterior abdominal circumferences and the endopod. Potential and conditional implications o F these results in the context of selective breeding are discussed.