Two 18/0 circle hook types allowed by the US federal government

Greenland shark (Somniosus microcephalus) feeding behavior on static fishing gear, effect of SMART (Selective Magnetic and Repellent-Treated) hook deterrent technology, and factors influencing entanglement in bottom longlines [PeerJ]

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Derke Snodgrass's research works National Oceanic and Atmospheric Administration, HI (NOAA) and other places

OROOTL Saltwater Large Giant Fishing Hooks Shark and Alligator Hooks Big Game Stainless Steel J Fishing Hooks Extra Strong Sharp Large Fish Hooks for Shark Swordfish Tuna Catfish Size 5/0-20/0

Joseph E. Serafy's research works University of Miami, FL (UM) and other places

A Comparison of Circle and J Hook Performance Within the Grenadian Pelagic Longline Fishery

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Big Game Cable Rig - J Hook

Joseph E. Serafy's research works University of Miami, FL (UM) and other places

Regulated Fishing Activities

Patrick RICE, Chief Science and Research Officer

Frontiers Sea Turtle Bycatch Mitigation in U.S. Longline Fisheries

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Influence of hook type on catch of commercial and bycatch species in an Atlantic tuna fishery - ScienceDirect

Fishing Hooks 101: Parts, Sizes, Types, and More