[Ebook] Encyclopedia of Aquarium & Pond Fish – Introduction to Pond Fish – Breeding – Reproductive cycle
The breeding triggers for coldwater fish are the rise in water temperature and increasing day length that occur in spring. Spring also sees an increase in insect life and aquatic crustaceans, providing food to bring adult fish into breeding condition and to sustain the fry. The breeding season is thus more prescribed than in many tropical species, for whom rainfall rather than temperature is the most significant factor.
