![]() ![]() Ī minimum of three people are required for power block seining the skipper, skiff operator, and corkline stacker. Their rpm, pull and direction can be controlled remotely. Nowadays, power blocks are usually driven by hydraulic pumps powered by the main or auxiliary engine. The original Puretic power block was driven by an endless rope from the warping head of a winch. ![]() ![]() The combination of these blocks with advances in fluid hydraulics and the new large synthetic nets changed the character of purse seine fishing. The Puretic power block line was introduced in the 1950s and was the key factor in the mechanization of purse seining. According to the UN Food and Agriculture Organization, no single invention has contributed more to the effectiveness of purse seine net hauling than the power block. The power block is a mechanized pulley used on some seiners to haul in the nets. The nets were woven from green flax, with stone weights and light wood or gourd floats, and could require hundreds of men to haul. For example, the Māori used large canoes to deploy seine nets which could be over a kilometer long. Seines have been used widely in the past, including by Stone Age societies. The word seine has its origins in the Old English segne, which entered the language via Latin sagena, from the original Greek σαγήνη sagēnē (a drag-net). A seine differs from a gillnet, in that a seine encloses fish, where a gillnet directly snares fish. Two main types of seine net are deployed from seiners: purse seines and Danish seines. Seine nets can be deployed from the shore as a beach seine, or from a boat.īoats deploying seine nets are known as seiners. Seine fishing (or seine-haul fishing / s eɪ n/ SAYN) is a method of fishing that employs a surrounding net, called a seine, that hangs vertically in the water with its bottom edge held down by weights and its top edge buoyed by floats. ![]()
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