Are those black things worms? Northern Pike caught in Georgian Bay

Trout of North America: The Complete Guide

Bustard Islands « The Famous Georgian Bay Bass Hole

Ontario Northern Pike Fishing Outpost

Ontario Northern Pike Fishing Outpost

What are the black lines in this filet of yellow perch? : r/Fishing

Hair Fishing Lures for Pike Fishing - In-Fisherman

Are those black things worms? Northern Pike caught in Georgian Bay Ontario. : r/Fishing

The Great Northern Pike of Georgian Bay

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Weird and Whacky Water Wonders! - State of the Bay

Bait Fish Additive, 100ml Red Worm Concentrate Liquid, Fishing Baits, High Concentration Fishing Lures, Fish Bait Attraction Enhancer for Trout, Cod

Liquid Bloodworm Compound

60ML Liquid Blood Worm Scent Fish Attractant Concentrated Red Worm

60ML Blood Worm Scent Fish Attractant Concentrated Red Worm Fish Bait Additive

Caught some crappie earlier today and was filleting them. Everytime I've noticed there red worm things. I'm wondering if anyone has seen them and/or knows what they are. : r/Fishing