Critical feature of development is switching from yolk to external food. This period appears to be critical. If larvae are unable to find food for a period they may irreversibly starve even if they find food. Feeding success 1. Larvae become more accurate at feeding strikes.
Sensory structures develop as they age.
Sculpin have exposed neuromasts when young and can detect brine shrimp when they are 6 days old. Their ability to detect tiny prey decreases as they age.