Fish produce a lot of egg cells for several reasons, including:
1. To increase the chances of fertilization: Fish live in aquatic environments, where the chances of finding a mate can be relatively low. By producing a large number of eggs, fish increase the likelihood that at least some of them will be fertilized and result in successful offspring.
2. To compensate for high mortality rates: Fish eggs and young are vulnerable to predation and environmental conditions, which can result in high mortality rates. By producing a large number of eggs, fish increase the chances that at least some of them will survive to adulthood and reproduce, ensuring the continuation of their species.