haisborough sands and its surrounding shoals are known to be spawning grounds for sand eels "ammodytes", lemon sole "microstormus kitt" and sole "solea solea". the sands also provide nursery grounds for cod "gadus morhua", herring "clupea harengus", mackerel "scomber scombrus", sole, lemon sole and plaice "pleuronectes platessa". there are small numbers of harbour porpoise regularly observed within the boundaries of the sands. the common seals "phoca vitulina" which are resident in the wash are occasionally observed in this area.