Table 1.

Broad sense heritability estimates (h²±s.e.) for parasite traits in the two intermediate hosts.

	trait	full-sib h2	n	N
	hatching	0.00±0.00	800	8
copepod (procercoid)	infectivity	0.65±0.01	1072	8
size	0.29±0.01	332	8
fish (plerocercoid)	infectivity	−0.09±0.01	170	8
weight	−0.35±0.04	21	7
respiratory burst	0.17±0.04	27	8
hepatosomatic index	−0.28±0.02	29	8

Sample size (n) and number of sibships (N) are given. Estimates that are significantly larger than zero are indicated in bold type.