the purse" from below. Purse seining for herring can be especially tricky as the entire process is run in the dark of night when herring swim to the surface to feed on rising phytoplankton. No lights are used until the seine is closed. The entire process starts with the release of the seiner's "bug boat." The bug boat, which holds one end of the net, motors in place while the larger seiner encircles the herring school (generally clockwise by convention in the Gulf of Maine). As the seiner encircles the herring, net is released. The top of the net stays at the surface, buoyed by a "float line." The bottom of the net is connected to the purse line by large, metal clips called "rings." These also act as weights that sink the net to depths of up to 100 meters. Once the seiner reaches the bug boat, the bug boat's float line is tied off to the gunwale of the seiner. The bug boat then motors to the opposite side of the seiner, attaches to the seiner using several lines, and powers
Particolour is also variable and its least expression may be a white locket or white spot on the forehead. The existence of breeds such as the York Chocolate (consistent particolour pattern) and Birman and Snowshoe (consistent mitted pattern) appear to support the existence of a white particolour gene and a white mitted gene. A pattern which has only rarely been reported in cats is the belt, blanket or sheet marking. This is common in pigs and cattle and in Dutch rabbits where a band of white encircles the animal's body like a belt. Another cause of white spotting is a somatic mutation i.e. some skin cells have a chance mutation which prevents them from producing pigment. This is not hereditary. Leukoderma ("white skin"), leukotrichia ("white hair") or vitiligo, is a cosmetic condition that produces a "cobweb" or "snowflake" effect and is most easily seen on black cats. White spots appear on the coat; these become more extensive with age until the cat has a white lace
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