A fishing net is a net used for fishing

Cast nets are small round nets with weights on the edges which is thrown by the fisher. Sizes vary up to about four meters (13 feet) in diameter. The net is thrown by hand in such a manner that it spreads out on the water and sinks. Fish are caught as the net is hauled back in.

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Nylon is highly resistant to abrasion and degradation, hence the netting has the potential to last for many years if it is not recovered. This is of environmental concern. Attaching the gillnet floats with biodegradable material can reduce the problem. However it is difficult to generalize about the longevity of ghost-fishing gillnets due to the varying environments in which they are used. Some researchers have found gill-nets still catching fish and crustaceans over a year after loss, while others have found lost nets destroyed by wave action within one month or overgrown with , increasing their visibility and reducing their catching potential to such an extent that they became a microhabitat used by small fish.

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40 items - Find cheap small fish nets for free shipping, worldwide delivery. It may sound like an exaggerated memory, but our grandfathers' stories of bigger fish on fishing trips years ago just may be true. Some fish today are smaller than in the past, and overfishing may be why.

Part of the reason seems simple. So many fishermen are catching fish these days, few fish have a chance to live long enough to grow very big. But there is also evidence that some fish are growing more slowly than their ancestors -- staying small enough to escape fishing nets designed to catch larger fish. The little fish, by escaping the nets, then become the parent stock of the next generation. Those smaller fish repeat the cycle until the average size of that of fish becomes measurably reduced.

Pink salmon may be the clearest example of this phenomenon. This species, , is one of five species of salmon, and it has a distinctive and predictable lifestyle. Pink salmon follow the pattern typical of other salmon species at first, hatching from eggs laid in freshwater streams, and drifting downstream to the sea almost as soon as they emerge. But unlike other salmon, which have more flexible life cycles, pink salmon return like clockwork after two years to mate and spawn and die in the stream where they were born. This punctuality means that fish born in odd years return in the next odd year and mate with other odd-year fish, while even-year fish do the same in even years. Thus these two populations are genetically distinct, and have different average sizes. And because all returning salmon are the same age, it's relatively easy to see the process of evolution at work.

Decades of overfishing resulted in 80 percent of the spawning stock winding up on dinner plates, and t the average size of a pink salmon coming to rivers to spawn has declined 30 percent in the last 40 years. This trend can't be explained away by fishermen catching the oldest fish, since these salmon always return to spawn at the same age. What the declining size shows instead is the evolution of pink salmon with slower growth rates, and a smaller size at maturity. Big fish produce more eggs than small ones and contribute more offspring to the next generation, so in the absence of fishing pressure, tends to favor the larger fish. These days, however, the larger fish are more likely to end up in a fishing net than to make it back to the stream where they were born in order to spawn. Human fishing pressure has tipped the evolutionary balance in favor of the smaller salmon.

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Gillnets are a series of panels of meshes with a weighted "foot rope" along the bottom, and a , to which floats are attached. By altering the ratio of floats to weights, buoyancy changes, and the net can therefore be set to fish at any depth in the water column. In commercial fisheries, the meshes of a gillnet are uniform in size and shape. Fish smaller than the mesh of the net pass through unhindered, while those too large to push their heads through the meshes as far as their gills are not retained. This gives gillnets the ability to target a specific size of fish, unlike other net gears such as , in which smaller fish pass through the meshes and all larger fish are captured in the net.

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