Sentence:  Now we plunged into a deep shade with the boughs lacing each other overhead, and crossed dainty, rustic bridges over the cold <WSD>trout</WSD>-streams, the boards giving back the clatter of our horses' feet:.... 
Meaning of the word marked with <WSD> tags:  Any of several species of fish in Salmonidae, closely related to salmon, and distinguished by spawning more than once.