The tribes also caught 14,422 sockeye this summer, about 500 with a tangle net and the rest with the purse seine. The summer-fall chinook or the sockeye are not ESA-listed. But the tribes' want a sufficient number of the wild fish to escape spawn and keep the populations healthy. The 700-foot long purse seine is deployed in a J or U shape, extending down into the water 40 feet. As it fills with fish, the ends are pulled together to entrap salmon and other stocks.