It's a marinated dish with a lot of vegetables. Mixing it with smoked salmon makes the dish even more delicious.
My kids love salmon, was trying to come up with a healthy vinegared dish with smoked salmon and vegetables.
If you like your vegetables, just use 50 g of salmon. You can increase the amount up to 100 g if you feel like having a lot of fish. Feel free to substitute celery with cucumber.
Enjoy Japanese food around the world.