Reference for Shabbat 202:1

אלא במים קל הוא שהקילו חכמים במים ואמאי הא איכא בקיעת דגים אלא ש"מ בקיעת דגים לא שמה בקיעה:

in water, this being a leniency which the Rabbis permitted in connection with water. But why so: surely there is the passing through of fish? Hence infer from this that the passing through of fish is not designated passing through. IF SHIPS ARE TIED TOGETHER, etc. This is obvious? — Said Raba. This is necessary only to permit [carrying via] a small boat [lying] between them.<span class="x" onmousemove="('comment',' The larger ships being fastened to the opposite sides of the boat, ');">¹</span>

Jastrow

Jastrow

Jastrow