Node yields assume the base harvest HP from game data (e.g. 1000 for Redwood trees, 620 for Metal nodes). In-game, trees and rocks with bAllowHarvestHealthScaling have per-instance HP that varies with the node's size, so actual yields per node will vary. The values shown represent the average.
These creatures reduce Raw Fish Meat weight when carried in their inventory.
The Pelagornis is the best Raw Fish Meat farmer with a 13.3x gather multiplier from game data. The Anglerfish is the runner-up with 3x.
The following creatures reduce Raw Fish Meat weight when carried: Helicoprion (-50%), Maeguana (-50%), Maewing (-50%). This means they can carry more Raw Fish Meat before becoming encumbered.