The table shown in that is OK. IMO it underestimates the mortality in years 2-5 though and gives a high mortality for age .5 through 1.

50-60% mortality is pretty common in the first year after stocking (1000 stocked = 400-500 alive). Then it's about a 25% loss each year until the fish reach maturity and legal harvest length then there is an increase in mortality. Then there is another increase as males reach about 10 years. As you can see the chart in the brochure and what I use to figure this still comes out about the same at years 10-15.

Here's what I usually use to explain this:
Fall fingerlings stocked: 1000 (50% mortality)
Year 1 = 500 (25% mortality)
Year 2 = 425
Year 3 = 319
Year 4 = 239
Year 5 = 179
Year 6 = 125 (30% mortality)
Year 7 = 88
Year 8 = 61
Year 9 = 42
Year 10 = 30 (40% mortality)
Year 11 = 18
Year 12 = 11
Year 13 = 7
Year 14 = 4
Year 15 = 2.5

Substantial fishing pressure (captures), large predators present (including muskies) can both increase the mortality.