In the scientific method, Occam's razor is not considered an irrefutable principle of logic or a scientific result; the preference for simplicity in the scientific method is based on the falsifiability criterion.
Many freshwater fish average about 1 to 3 years of life. Some of the more popular species with this short life span include fantail guppies, swordtail platy, mollies, rainbow fish, hatchet fish, corydoras catfish, some cichlids, rasboras and tiger barbs. There are also several fish that live around 3 to 5 years, with proper care and feeding.
Although the majority of types live 20 to 30 years in the wild, there are some kinds that live much longer than others. For example, the spiny dogfish has one of the longest lifespan at more than 100 years, while the blue shark in the wild has an average lifespan of 15-16 years.