- Apr 15, 2014
Makes sense to me. Class A BT biomass alone may not qualify a stream for EV if other DEP criteria for listing aren't met. It's not about one species versus another or species preference or disdain for non-native trout. ST requiring better water conditions likely means that if they're present, all other metrics are likely present for listing as EV as well. BT might be Class A biomass, but other metrics don't meet the requirement, so there's a question about whether Class A BT streams should be listed as EV.
Class A biomass is not a qualifier for EV, it is one of the criteria for HQ.
I think what has been found several DEP stream investigations is that there are streams where a Class A brown trout population has been recently identified, but other chemical parameters and macroinvertebrate indices do not meet the thresholds for HQ. Think ag valley streams with lots of sedimentation, high nutrient levels and suppressed macro life.