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MECHANICAL FISH CONTROL <br />ACTIVE FISHING GEAR <br />TYPES <br />SEINES <br />TRAWLS <br />DREDGES <br />ADVANTAGES <br />DOES NOT DEPEND ON FISH MOVEMENT FOR CAPTURE <br />CAN STRAIN LARGE AMOUNTS OF WATER <br />DISADVANTAGES <br />ALL FISHING GEAR IS SELECTIVE <br />(E.G. MORPHOLOGY, SIZE, SEX, <br />SWIMMING SPEED, BEHAVIOR, HABITAT) <br />OBSTRUCTIONS LIMIT USE OF SOME GEAR <br />MAY REQUIRE MECHANISMS FOR RETRIEVAL <br />BEHAVIOR OF FISH TO GEAR IMPORTANT <br />BUT GENERALLY NOT KNOWN <br />n