History of discovery deep sea fish

Its environment was very severe, and since the range of deep sea was also very wide, compared with the shallow sea, observation and research were difficult for it.
Therefore, it was unknown whether a living thing existed, while it was long.
The deep sea inanimate object theory was announced in 1839. This was advocated by British scholar Edward Forbes. Deep sea inanimate object theories are the contents that a living thing does not exist in deep sea (range deeper than the depth of water of 548 m). This was considered from the results of an investigation of the survey ship performed by many years. Many people consented to this opinion and the living thing was widely considered not to exist by deep sea. However, the living thing was successively extracted by investigation of each country using a subsequent trawl and submarine cable from deep sea. Therefore, this deep sea inanimate object theory will be denied. However, about a deep sea living thing actually existing, it was not proved deterministically. Existence of a deep sea living thing was deterministically proved during 1876 after 1872. The large　scale round　the　world voyage of exploration by the challenger number of Royal Navy was carried out in the four years. The research findings of huge oceanography were brought about by this voyage. By these research findings, oceanographic investigation became full　scale in many countries. The history of research of deep sea fish also began from here. Therefore, research of deep sea fish was very difficult and did not progress easily. The deep sea fish which was caught in the net of the fishery by chance, or was launched by the seashore became a very precious specimen. However, the figure in which deep sea fish is actually alive could not be checked, and the information about a native habitat or ecology was hardly able to be acquired. The specimen extraction from deep sea was attained by improvement of a wire rope or a trawl after the second half of the 19th century. However, it was not still easy to carry out direct observation of the deep sea fish. The submarine was already put in practical use as a weapon at the time of World War I. However, the diving apparatus of it for the scientific purpose was behind by one side. In 1928, the ball in which people can ride and which can be dived was developed and observation of deep sea fish was attained at last. The ball in which the diving is possible was called Batisufair. Although Batisufair has not power, it succeeded in diving to the depth of 923 m. And deep sea investigation boat which is called bathyscaphe with power were built in 1948. Two or more succeeding machines were made and the bathyscaphe provided ecology observation of deep sea fish and a specimen collection with large depth with the powerful means. From the second half of the 20th century to the present age, investigation by Shinkai 6500 of Japan, the meal of Russia, the U.S. Alvin number, and so on is led, and the information about adaptation to the lifestyle and environment of deep sea fish is being accumulated. However, many mysteries still exist in deep sea fish. I would like to introduce being known through my blog now as much as possible.