Although 'shore-burning' is the normal condition for those who are used to seeing the present rocky shores and they can not get a real sense of that term, half a century ago, people commonly saw rocky shores under water which were so densely covered with marine plants that rocks were not visible.
なお、現代の磯を見慣れている人には「磯焼け」が常態であるのでこの言葉に実感はないが、半世紀前の人々が普通に見た磯（水中）は、岩などが見えないほど海草が生い茂っていたのである。