Fishermen call them "meat hogs", anglers who seem to catch and keep more than their fair share of fish. Scientists refer to this as "harvest inequality", a situation in which most of the fish are harvested by a disproportionately small number of anglers. It's a fairly common characteristic of recreational fisheries. The situation can develop in one of two ways; either when a few anglers harvest a very large number of fish, or when many anglers harvest few fish.
It is important to understand the cause of harvest inequality, because only by doing so can you then understand if traditional management techniques (such as creel limits, which are aimed at reducing the top anglers’ take) can reduce the inequality. Researchers studied 20 years of creel census data from a trout stream in southeastern New York as a means of measuring harvest inequality. They then ran a series of complicated caluclations to determine the exact nature of the inequality. As it turned out, results consistently indicated that harvest inequality was caused by many anglers harvesting no fish rather than by few anglers harvesting many fish. In other words, the greater the number of anglers who practice 'catch and release' angling on a fishery, the less likely it is that management efforts will have an impact on controlling the situation (the inequality). The reason is because regulations do not target the principal cause of harvest inequality. As such, the researchers theorized that harvest inequality is likely unmanageable.