JK and JL
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Purse Seiner

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The Merriam Webster definition of seine is large net with sinkers on one edge and floats on the other that hangs vertically in the water and is used to enclose and catch fish when its ends are pulled together or are drawn ashore.

Seine fishing is fishing using a seine.
Boats equipped for seine fishing are called seiners.
Purse seiners longer than 70 meters are called super seiners.
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Seine nets are usually long flat nets like a fence that are used to encircle a school of fish, with the boat driving around the fish in a circle. A common type of seine is a purse seine, named such because along the bottom are a number of rings.

The purse seine is used for capturing fish species which school, or are close to the surface.
For example:
· sardines
· mackerel
· anchovies
· herring
· certain species of tuna

Power block

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The power block is a mechanized pulley used on seiners to haul in the nets.
A type of power block is the Puretic Power Block line was introduced in the 1950s and is the key factor in the mechanization of purse seining.
Power blocks are usually driven by hydraulic pumps powered by the main or auxiliary engine. Their RPM or pull and direction, can be controlled remotely.


For more information:
http://en.wikipedia.org/wiki/Purse_seiner
http://www.fisheries.is/the-fisheries/fishing-gear/purse-seine/
http://www.afma.gov.au/information/students/methods/purse_seine.htm
http://www.fao.org/fishery/geartype/249