TJ,
The literature is a good reference for simultaneous stocking with fingerling fish but your experience (and Bill's) of introducing into ponds with adult fish is very valuable.
Generally, when a new species invades a new habitat it will build in numbers over a few seasons finally reaching it's a maximum after this buildup. Fish eat them and they would be poor forage if they didn't so this predation helps to slow down the build up. After 7 years, what are your thoughts on how long it took for the PK shrimp to reach their final place?
PK shrimp evolved with macrophytes as habitat and their importance is duly noted. But it may surprise one to learn that there is an alternative to them for cover. Brush has been demonstrated to greatly increase production of PK shrimp relative to controls and may work to protect a population while the macrophytes populations are developing.
