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Major sites of lipid deposition in bony fish are perivisceral in the coelom, within the muscle, and in the liver. In some species, lipid accumulation also occurs in the brain and under the skin (Weil et al. 2013). Coelomic fat is intended for long‐term storage of lipids while liver and muscle allow easier mobilization of lipids (Sheridan 1994). Lipids in active bony fish tend to be stored in the skeletal muscle while bottom dwellers tend to store lipids in the liver (Sheridan 1988). Of the two skeletal muscle types, red muscle stores more lipids than white (Sheridan 1988).

Fat deposits fluctuate seasonally in wild animals but are less likely to change across the year in fish under human care. Over‐conditioning of fish is a common problem under human care, particularly in large, mixed species habitats. Appropriate diets, targeted feeding, and suitable fasting periods can help in those situations.