Woody wrote:The amount of biomass that is removed from the Great Lakes each year through fishing is incredible. Everything that is taken out has to be replaced some how... When a fish eats another fish the nutrients don't leave the closed system, but when humans keep their catch it removes nutrients from a system that has a limited source of replenishment. Fisherman should be required to discard their scraps back into the water they removed it from or a connecting water way. Problem is, the government outlaws that in a lot of places because rich people don't want dead fish on their beaches.
Don't worry, all the sewage from all the cities around the lake replace those nutrients for you in the lake
These are not closed systems. You have a massive amount of nutrients entering the system ever year. If it were not for all the zebra mussels, the great lakes would look a lot different.
What the common carp do is that they stir up a massive amount of silt. This does all kinds of destructive things. While the main body of the waterway or lake may be clear where most people fish and boat. You get back into the shallow bays where the small fish are born and raised and it silts over the eggs, deprives the oxygen, and is just very destructive. In a hard bottom system, they are not much of a problem, but any soft bottom system, they are a fucking disaster.
At my hunting/fishing club, we have several lakes. Weed control is a big problem in these shallow lakes because of the excess nutrients from the runoff as well as being shallow and warm up and get a lot of light. We fluridone (Sonar) the lakes on a cycle. Fluridone pretty much kills every weed. Not desirable, but the only thing that is really affordable. Nuke it, then we get a year or two of completely open. Good for the fishermen. Terrible for the young fish. Then the weeds come back pretty strong pretty quickly. We let it like that for a year or two. Good for recruitment of the little fish, but unfishable in the summer. This is our cycle and it seems to work pretty well.
The one lake. There are so many carp that we get a couple extra years out of the treatment because they keep the silt so stirred up that the plants don't grow well. Last fall I went around the entire lake inspecting duck blinds and the silt on the weeds was just horrible. Just a fucking mess. I'm going to put together a plan to try and hammer the carp population in that lake. We've done this before with good success. Basically pay the member to catch and kill the carp.