Estimates of MPH for the performance traits ranged
from 10.93% to 95.65% for all hybrids combined
(Fig.4). Negative values of MPH do not necessarily indicate
poorer performance such as in C F. A favourable
heterosis rate for specific growth rates was
calculated as 95.65%between days110 and 200 intriploid
hybrids. Estimates of MPH for the performance
of weight ranged from 6% to 70% in unshocked hybrids,
and from 1.6% to 50.4% in shock-induced triploid
hybrids.