The capture and movement of wild-caught baitfish is of special concern for spreading Asian carp. Young Asian carp could easily be transferred, as baitfish, from one body of water to another.
Eradication of any established population of Asian carp would be extremely difficult and expensive, if possible at all. Effective management of established invasive species that cannot be eradicated usually employs integrated pest management.
Yes. Gas bladders, more commonly referred to as swim bladders, allow precise control of buoyancy because the volume of gas they contain can be regulated with ease. Two types of swim bladders exist.
Silver carp have been observed to leap into the air simultaneously as an apparent fright reaction to rocks thrown in the water, passing trains, geese taking off from the water, or when they unexpectedly find themselves in a tight place.
This is a very broad question, and difficult to answer without a bit more context. Pollution comes in many forms; chemical, thermal, acoustic, and physical for example.
Effects to industries such as oil and gas cannot be predicted, but healthy marshes and barrier islands are known to be important storm buffers to Louisiana's mainland.
Many, but not all, fish kills in the summer result from low concentrations of dissolved oxygen in the water. Fish, like all other complex life forms, need oxygen to survive. They get theirs in the form of oxygen gas dissolved in the water.
Wetlands are transitional areas, sandwiched between permanently flooded deepwater environments and well-drained uplands,  here the water table is usually at or near the surface or the land is covered by shallow water.