Ephemeral Nodes

Collectable items  gathered from Ephemeral Nodes are used for Aetherial Reduction. They convert into crystals, clusters, and varying types of aethersand. The type of aethersand you get upon Aetherial Reduction depends on the item you reduce. Each particular Collectable can only reduce into one kind of aethersand. As for the Crystals and Clusters acquired, they will normally be the same type as the ones already gatherable from the node.

Unlike Unspoiled Nodes and Folklore Nodes, Ephemeral Nodes do not get called out on the minimap with a direction indicator, so players will need to use Lay of the Land or Arbor Call to locate them. Another difference is that Ephemeral Nodes spawn in clusters of 3, and will continually respawn like normal nodes as long as it's still within the time window. Ephemeral Nodes are active for four Eorzea Time / in-game hours.

Players can unlock Collectables by completing the level 50 quest Inscrutable Tastes.
Players can unlock Aetherial Reduction by completing the level 56 quest No Longer a Collectable.
The higher the collectability of the item is, the greater are the chances of getting higher quantity of items.

See the tables below for when and where Ephemeral Nodes spawn, as well as which Collectables reduce into which aethersand.

Note: The Collect ability must be active to catch any fish as a collectible. Non-collectible versions of these fish have no use whatsoever.

Note2: After the collectables changes in patch 5.4, older nodes with formerly dual-use Crafting Materials now have new collectables present, these are marked  for clarity.

Dawntrail

Botanist

Time	Zone	Coordinates	Closest Teleport	Items	Items gained from Aetherial Reduction
4AM-8AM	Shaaloani	(x16,y10)	Sheshenewezi Springs	Goldbranch (Lvl 100) Wind Crystal Wind Cluster	Sungilt Aethersand Wind Crystal Wind Cluster
4PM-8PM	Living Memory	(x27,y7)	Leynode Aero	Volcanic Grass (Lvl 100) Fire Crystal Fire Cluster	Mythroot Aethersand Fire Crystal Fire Cluster

Miner

Time	Zone	Coordinates	Closest Teleport	Items	Items gained from Aetherial Reduction
8PM-12AM	Heritage Found	(x27,y12)	The Outskirts	Electrocoal (Lvl 100) Earth Crystal Earth Cluster	Sungilt Aethersand Earth Crystal Earth Cluster
12AM-4AM	Living Memory	(x10.5,y11)	Leynode Aero	Brightwind Ore (Lvl 100) Lightning Crystal Lightning Cluster	Mythloam Aethersand Lightning Crystal Lightning Cluster

Fisher

Conditions	Zone	Coordinates	Closest Teleport	Fish Name	Weather	Bait	Items gained from Aetherial Reduction
None	Yak T'el	(x33,y16)	Iq Br'aax	Horned Frog (Lvl 96)	All Weather	File:??.png ??	Ice Crystal Ice Cluster Sungilt Aethersand
None	Kozama'uka	(x25,y31)	Many Fires	Shovelnose Catfish (Lvl 95)	All Weather	File:??.png ??	Ice Crystal Ice Cluster Sungilt Aethersand
None	Yak T'el	(x28,y5)	Iq Br'aax	Sunlit Prism (Lvl 100)	Unknown	Spearfishing	Water Crystal Water Cluster Sungilt Aethersand
None	Living Memory	(x12,y11)	Leynode Aero	Cleyran Carp (Lvl 100)	All Weather	Popper Lure	Water Crystal Water Cluster Mythbrine Aethersand
None	Shaaloani	(x32,y11)	Mehwahhetsoan	Longnose Gar (Lvl 100)	Unknown	Spearfishing	Ice Crystal Ice Cluster Mythbrine Aethersand