Finely dice remaining cucumber sticks. Wash dill and chop finely. Mix crabs, cucumber and dill and season with a little salt and pepper. Cut nori leaf (approx. 19 x 21 cm) from the long side into 8 strips.
Form 16 balls from some cooked sushi rice and flatten them into round talers of approx. 4 cm Ø and approx. 1-1 1/2 cm high. Dip hands in vinegar water in between. Coat the talers with a little wasabi.
Wrap one nori strip around each one so that the leaf protrudes approx. 1 cm. Moisten the ends of the strips with vinegar water and press on well. Fill 8 sushi with crab salad and 8 with trout caviar.