Freezing is the best method of keeping fish stored. If stored properly in an air tight container, or freezer paper or plastic freezer bags, fish can remain good in the freezer for up to a few years....
It should not be left out. Frozen chicken should be thawed under refrigeration. If you choose to use a quick thaw method (water bath, microwave), then cook it immediately upon thawing.
This depends on temperature and pressure if you mean STP, standard temperature and pressure,' one atmosphere and 25 C, please state so. If you need to store it put it in a thermos, (Dewar flask). Ask...