If a murky lake is stocked with a number of species of cichlid fish from lake victoria, what is most likely to happen?

Cichlid fish will start killing all other species in the lake

Explanation:

Cichlid fish are very aggressive type of fish and some of its species are extremely aggressive than any other species of fish specially the ones found in tropical community fishes.

Thus, if cichlids fish is introduced into the murky lake, it will start preying other  smaller tropical fishes and water species aggressively . Due to this the ecological balance of murky lake may get disturbed and soon the lake may turn into a dead lake.

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.