Will caught 16+10= <<16+10=26>>26 fishes
Henry caught 3 trout for each catfish Will caught so since Will caught 16 catfish, Henry caught 16*3 = <<3*16=48>>48 trout
Half of 48 trout is (1/2)*48 = 24
Henry returned 24 trout leaving him with 48-24 = <<48-24=24>>24 trout
They now have a total of 26+24 = <<26+24=50>>50 fishes
#### 50