The Cran was a so called imperial measure and each basket had a royal stamp burned into it. This meant that to cheat on this weight was to cheat the Crown and in the 50's and 60's this was taken seriously and enforced. Rather than risk a fine for underweight the baskets would be overfilled with fish falling out as they were hoisted from the deck to the lorry on the quay. As young boys we would often get a few herring or sprats which had fallen off around the lorry to put on a string and sell locally for a little pocket money.
On another tack the term Bakers Dozen meaning 13 comes from the same laws. Bread was a specific weight and rather than be fined the baker would get round this by giving an extra one of whatever for every twelve bought hence the term.
dont remember a specific name for them ,,just the hooks.. or landing hooks,,
sometimes one side would come off the basket as it touched the lorry,and fly up in the air, they were called something then,but cant print it.......................