siamese fighting fish diseases pictures1991 identified five major types of enrichment, each of which could be subdivided: social contact or noncontact, occupational mental or pastime, physical enclosure or add-ons, sensory visual, auditory or other stimuli, and nutritional beginning or type . Spacial comlexity of enclosures during the early rearing period effects in behavioral flexibility in a number of species of teleost. For example, enriched environments have been shown to stimulate exploratory behavior in hatchery bred North Sea cod , enhance foraging behavior in Atlantic salmon , and enhance cognitive skills in Simochromis pleurospilus . Enriched atmosphere has also been shown to improve the survival rates of hatchery reared fish released into the wild . Social environment, cohabitutation with conspecifices, also affect later functionality, as a result of social behaviors are partly adventure based. Rearing dencity impacted shorling conduct and social learning in guppy .