Ringed seals may also eat herring, smelt, whitefish, sculpin, perch, and crustaceans. They feed in shallow littoral waters on herring, flounder, hake, anchovy, codfish, and sculpin. California herons were found to live mostly on sculpin, bass, perch, flounder, and top smelt. It is also known as the miller's thumb, freshwater sculpin, and common bullhead. Mottled sculpin occurrence is discontinuous in its range. However zinc is not the only metal threatening mottled sculpin populations. The breeding season for mottled sculpin is during April and May. The mottled sculpin is currently not federal or state listed for being threatened or endangered. The cave stream contains fish known as sculpin. The mottled sculpin has historically been found throughout all the environments listed above. Mottled sculpin reach sexual maturity at the age of two. Of these three metals zinc seems to be the most threatening to the mottled sculpin. Its main competitors are other small bottom dwelling fish, especially other sculpin species . About half the octopuses were within 5 metres of an adult or breeding sculpin. The blob sculpin, "Psychrolutes phrictus", exhibits complex nesting behaviors complete with egg guarding.