This is the 16460th most frequent Russian word.
рыбными
"Relating to fish" or "fishy" (instrumental plural form of "рыбный").
In this sentence, 'рыбными' (fish-related) is used as an adjective describing 'блюдами' (dishes), indicating a characteristic of the dishes.
Я увлекаюсь рыбными блюдами.
I am fond of fish dishes.
Here, 'рыбными' describes 'добавками' (additives), specifying the type of additives present in the canned goods.
В магазине продаются консервы с рыбными добавками.
In the store, canned goods with fish additives are sold.
In this instance, 'рыбными' modifies 'узорами' (patterns), indicating the patterns are of fish or fish-related themes.