Abstract
Reproductive behavior, spawning season and development of eggs and larvae of Mugilogobius abei were studied. Materials used in this study were taken periodically from Takahama Channel, Tokyo Bay, during the period from April to October, 1979.The spawning season seems to continue from April to August, with a peak in May.Spawning was accomplished at least more than one time during the spawning season.The oval eggs were 0.98 mm (mean) in length, 0.45 mm (mean) in breadth.Eggs hatched 97 hours after their discovery at 24.0°-24.6°C.The larvae reached the juvenile phase and wholly abandoned their planktonic mode of life 44 days after hatching at 22.5°-29.1°C. It was assumed that larvae in the field return, not immediately, but rather gradually to the native habitat, after completing the planktonic mode of life.
