Fish and meat may not be cooked or eaten together. However,
unlike milk and meat, fish and meat may be eaten at the same meal as separate
courses. Silverware and plates which have been used for fish may only be used
for meat after they have been washed. Between the fish and meat courses, one
should eat something that does not stick to the palate and take a drink
(preferably other than water). Some people also rinse their hands slightly
between courses.
Customs vary regarding the use of fish and dairy. Most
communities permit the combination of fish and butter. In certain communities,
fish is not combined with milk or cheese. Fish and dairy may be served at the
same meal with separate plates and silverware.