I don't know too much about management of Lake Wilson and who owns the lake. But based on what has been posted here, the lake has not reached low enough below its required maintained level (I think the reply to Stan's email was 60-65 feet) as of the last post that Stan put up...maybe things changed by now.
Certainly, there could be several angles here...such as if a fish kill would happen, bacteria levels in the lake would rise affecting water quality, the stench of dead fish would affect the town of Wahiawa, the lack of smaller baitfish to control mosquito larvae could cause an infestation, the combination of fish kill and the massive influx of available nutrients into the system from rotting fish could cause an algal bloom that would also smell bad and decrease water quality...
I'm not too sure on what is required by DEP in order for the state, county, city or private owners to minimize the risk of fish kill unless it gets to the point of unsanitary and a potential health risk. If the owner of the lake is concerned with the coming winter water level, and keeping the lake low to provide enough storage for water to prevent flooding in the winter, then I would say unless the current lake level has passed the legally required minimum (60 feet), there is little that can be done. Protecting lives and property downstream of the lake always take priority over fish unless the fish kill create an unsanitary situation. And unfortunately, until such scenario occurs, the State or DEP will likely not pay much attention...
I may have suggested this in the past...perhaps this could be a good time to think about it with the low water level...it may be wise to perhaps install some windmills on Lake Wilson to help with oxygenating the water, as well as mixing of cooler water from the lake bottom with the warmer water at the surface, to provide a better habitat for all fish. I kept reading (maybe they are all hearsay and not necessarily true) that the deeper areas of the lake below a certain depth is rather hypoxic since there is little mixing of water. At these time of low water, a few of these windmills can help to provide habitable zones for fish. These are windmills are quite common in mainland US, especially for smaller ponds and lakes in the southern US where summer temperature can get quite high.
Unless there are any endangered native fish species in Lake Wilson that needs protection, I don't think you'll get a lot of help from Federal fish protection acts. Most of the fish in Lake Wilson were intentionally or illegally stocked into the lake...it really is just a melting pot of species that are not native to Hawaii...so there really is little weight to ask for protection of fish that does not belong in the first place.
Look at the bright side though...if a massive fish kill does happen, it's a good opportunity to reduce or eliminate the hated red devil, banded jewel cichlid (5-star general) and any unwanted species in Lake Wilson (and I'll quietly weep for the disappearance of those cool but illegally stocked species). Then there will be a precedence case as to what too low a level can do, you can push for installation of windmills to improve water mixing and oxygen level, push for increasing the minimum lake level, and restock the lake with whatever species you so desire with a clean slate (unfortunately, I will quietly weep that there will be too many largemouth and smallmouth bass
Sorry, I just love variety, that's all...).
There is a Chinese saying that with every crisis come opportunities...in fact, the noun "Crisis" in Chinese is composed of two words...the first word means danger or hazard, and the second word means chance or opportunity, depending on how you pair that root word with other words. But you can see that wise Chinese old men from the past had made that noun...so look for opportunities amid crisis.
I feel for you guys, I really do...Lake Wilson is such a fun lake to fish and there are always a lot of surprises to catch.
however either march or april 2011 i had a 26 laregmouth day.