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a fish tags tech talk 79 tagging fish ... can be useful in fisheries research as well as broodstock management when used ... keeping tags can keep track of sex age genetic line year class dispersal ... or that the fish s name is bob making a good tag consistently can take some ... of the fish this means you should actually feel the bone when setting the tag 1 ... when it is tagged to reduce movement anesthetized fish should be held firmly as well ... squirming fish can bend the needle and cause injury 2 using the needlepoint ... lift up a scale on the left side of the fish and ... insert the needle at the anterior forward base of the dorsal fin forcing ...