| 摘要 |
A fish hook has a tubular hollow main body with a retractable hollow needle fitted in its hook end, and a cap at its shank end where the hook attaches to a line. An antiseptic or anesthetic liquid solution is loaded in the main body, through the opening that is closed by the cap. When a fish is hooked, pushing in the needle, the liquid solution is ejected into the fish, enabling the capture of large and small fish alive and unhurt for biological study and to populate aquaria, as well as the catching of game fish.
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