The gestation period may be as short as a few days or as long as several months. The number of offspring is inversely related to the chance a single egg has to reach maturity and reproduce. In general, species whose eggs have little chance to reach maturity lay the most eggs. Within a species, the number of offspring a female produces varies according to many factors including age, size, food availability, species, season, and water temperature. F. Parental care.
Many species give no care to their eggs or young.
Parental responsibility only includes getting eggs and sperm in the vicinity of each other. Some species hide their eggs. Some species guard their eggs. Some ovoviviparous and viviparous bony fishes bear live young that can protect themselves at birth. Very little, if any, parental care is needed after hatching.