The disciples' simple "No" is more than just a statement of fact; it reveals their state of mind and their readiness for what Jesus would do.
The disciples' response, "No," is brief but powerful. It signifies:
Honest Effort, Empty Nets
They had been toiling all night, employing their professional skills, yet they had caught nothing. Their "No" is a raw admission of their exhaustion and their failure in their own strength.
A Need for Divine Power
This emptiness sets the perfect backdrop for Jesus to demonstrate his power and authority. Had they caught fish, the miracle would have been less striking. Their "No" underscores their dependence on something beyond their own labor.
Unrecognized Authority
Crucially, they give this honest answer to someone they haven't yet recognized as Jesus. This suggests that his tone, though loving, was perhaps authoritative enough that they answered directly, or perhaps they were simply honest with any stranger inquiring about their fruitless work.