Fish do not have a single universal mating season. Different species have different reproductive strategies, and spawning times vary by species and environment.
Temperate fish: Species like salmon and trout often have specific breeding seasons tied to water temperature or day length.
Tropical fish: Those in stable environments may breed continuously or multiple times per year, often when water temperature is between 75–85°F (24–29°C).
Year-round breeders: Some species, such as guppies, reproduce continuously as long as conditions are favorable.