Analysis of River-Mates

I’LL be an otter, and I’ll let you swim
A mate beside me; we will venture down
A deep, dark river, when the sky above
Is shut of the sun; spoilers are we,
Thick-coated; no dog’s tooth can bite at our veins
With eyes and ears of poachers; deep-earthed ones
Turned hunters; let him slip past
The little vole; my teeth are on an edge
For the King-fish of the River!
I hold him up
The glittering salmon that smells of the sea;
I hold him high and whistle!
Now we go
Back to our earths; we will tear and eat
Sea-smelling salmon; you will tell the cubs
I am the Booty-bringer, I am the Lord
Of the River; the deep, dark, full and flowing River.