Ore packs are craftable items that can be sold or used to compact ores together for storage.
Obtaining
Ore fish are obtained by fishing, they count as a 'Treasure' item, meaning you have a higher chance of obtaining these with the Luck Of The Sea enchantment.
Ore Fish can be smelted down, depending on the fish.
Can be used as furnace fuel. Has a fuel duration of 90 seconds, smelting 9 items in a regular furnace. (Comparable to coal with 80 seconds).
Can be smelted into an iron nugget.
(Not to be confused with a goldfish) Can be smelted into a gold nugget.
Can be smelted into an copper nugget.
Can be smelted into an emerald shard.
Can be smelted into an diamond shard.
Can be smelted into an amethyst shard.