Blue Peter "Sailors Hornpipe" was used instead. The opening theme has been updated several times. The following is a list of all the versions of the "Blue Peter" signature tune, "Barnacle Bill" that have been used on the show : The debut of a new version of the famous theme tune "Barnacle Bill" is sometimes accompanied with an introduction by the presenters at the time explaining the reasons behind the new rendition. Mike Oldfield appeared on the programme around 1979, and his version of the theme tune was so popular with viewers that the producers decided to record it for use as
Bay barnacle and undergo metamorphosis into juveniles. There may be several broods in the year but usually just two in the cooler waters of the Baltic and only one in low salinity environments. Bay barnacle Amphibalanus improvisus, the bay barnacle, is a species of acorn barnacle in the family Balanidae. "Amphibalanus improvisus" has a smooth white or pale grey conical calcareous shell composed of six fused plates. There is an oval or rhombic opening at the top which is blocked by two hinged plates. Adults usually grow to about in diameter and in width though they are sometimes larger than this and